Articles | Volume 12, issue 10
https://doi.org/10.5194/tc-12-3311-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-12-3311-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
16 Oct 2018
Research article |
| 16 Oct 2018
| 16 Oct 2018
19th century glacier retreat in the Alps preceded the emergence of industrial black carbon deposition on high-alpine glaciers
Michael Sigl
CORRESPONDING AUTHOR
Laboratory of Environmental Chemistry, Paul Scherrer Institut, 5232
Villigen, Switzerland
Oeschger Centre for Climate Change Research, University of Bern, 3012
Bern, Switzerland
Nerilie J. Abram
Research School of Earth Sciences and the ARC Centre of Excellence for
Climate System Science, Australian National University, Canberra 2601 ACT, Australia
Jacopo Gabrieli
Institute for the Dynamics of the Environmental Sciences, National Research Council (IDPA-CNR), 30172 Venice, Italy
Theo M. Jenk
Laboratory of Environmental Chemistry, Paul Scherrer Institut, 5232
Villigen, Switzerland
Oeschger Centre for Climate Change Research, University of Bern, 3012
Bern, Switzerland
Dimitri Osmont
Laboratory of Environmental Chemistry, Paul Scherrer Institut, 5232
Villigen, Switzerland
Oeschger Centre for Climate Change Research, University of Bern, 3012
Bern, Switzerland
Department of Chemistry and Biochemistry, University of Bern, 3012
Bern, Switzerland
Margit Schwikowski
Laboratory of Environmental Chemistry, Paul Scherrer Institut, 5232
Villigen, Switzerland
Oeschger Centre for Climate Change Research, University of Bern, 3012
Bern, Switzerland
Department of Chemistry and Biochemistry, University of Bern, 3012
Bern, Switzerland
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Paolo Gabrielli, Theo Manuel Jenk, Michele Bertó, Giuliano Dreossi, Daniela Festi, Werner Kofler, Mai Winstrup, Klaus Oeggl, Margit Schwikowski, Barbara Stenni, and Carlo Barbante
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Revised manuscript not accepted
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We present preliminary analyses of the annual sea salt concentrations and snowfall accumulation in a new East Antarctic ice core, Mount Brown South. We compare this record with an updated Law Dome (Dome Summit South site) ice core record over the period 1975–2016. The Mount Brown South record preserves a stronger and inverse signal for the El Niño–Southern Oscillation (in austral winter and spring) compared to the Law Dome record (in summer).
Daniela Festi, Margit Schwikowski, Valter Maggi, Klaus Oeggl, and Theo Manuel Jenk
The Cryosphere, 15, 4135–4143, https://doi.org/10.5194/tc-15-4135-2021, https://doi.org/10.5194/tc-15-4135-2021, 2021
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In our study we dated a 46 m deep ice core retrieved from the Adamello glacier (Central Italian Alps). We obtained a timescale combining the results of radionuclides 210Pb and 137Cs with annual layer counting derived from pollen and refractory black carbon concentrations. Our results indicate that the surface of the glacier is older than the drilling date of 2016 by about 20 years, therefore revealing that the glacier is at high risk of collapsing under current climate warming conditions.
Shugui Hou, Wangbin Zhang, Ling Fang, Theo M. Jenk, Shuangye Wu, Hongxi Pang, and Margit Schwikowski
The Cryosphere, 15, 2109–2114, https://doi.org/10.5194/tc-15-2109-2021, https://doi.org/10.5194/tc-15-2109-2021, 2021
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We present ages for two new ice cores reaching bedrock, from the Zangser Kangri (ZK) glacier in the northwestern Tibetan Plateau and the Shulenanshan (SLNS) glacier in the western Qilian Mountains. We estimated bottom ages of 8.90±0.57/0.56 ka and 7.46±1.46/1.79 ka for the ZK and SLNS ice core respectively, constraining the time range accessible by Tibetan ice cores to the Holocene.
Ling Fang, Theo M. Jenk, Thomas Singer, Shugui Hou, and Margit Schwikowski
The Cryosphere, 15, 1537–1550, https://doi.org/10.5194/tc-15-1537-2021, https://doi.org/10.5194/tc-15-1537-2021, 2021
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The interpretation of the ice-core-preserved signal requires a precise chronology. Radiocarbon (14C) dating of the water-insoluble organic carbon (WIOC) fraction has become an important dating tool. However, this method is restricted by the low concentration in the ice. In this work, we report first 14C dating results using the dissolved organic carbon (DOC) fraction. The resulting ages are comparable in both fractions, but by using the DOC fraction the required ice mass can be reduced.
Sebastian Hellmann, Johanna Kerch, Ilka Weikusat, Andreas Bauder, Melchior Grab, Guillaume Jouvet, Margit Schwikowski, and Hansruedi Maurer
The Cryosphere, 15, 677–694, https://doi.org/10.5194/tc-15-677-2021, https://doi.org/10.5194/tc-15-677-2021, 2021
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We analyse the orientation of ice crystals in an Alpine glacier and compare this orientation with the ice flow direction. We found that the crystals orient in the direction of the largest stress which is in the flow direction in the upper parts of the glacier and in the vertical direction for deeper zones of the glacier. The grains cluster around this maximum stress direction, in particular four-point maxima, most likely as a result of recrystallisation under relatively warm conditions.
Guillaume Jouvet, Stefan Röllin, Hans Sahli, José Corcho, Lars Gnägi, Loris Compagno, Dominik Sidler, Margit Schwikowski, Andreas Bauder, and Martin Funk
The Cryosphere, 14, 4233–4251, https://doi.org/10.5194/tc-14-4233-2020, https://doi.org/10.5194/tc-14-4233-2020, 2020
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We show that plutonium is an effective tracer to identify ice originating from the early 1960s at the surface of a mountain glacier after a long time within the ice flow, giving unique information on the long-term former ice motion. Combined with ice flow modelling, the dating can be extended to the entire glacier, and we show that an airplane which crash-landed on the Gauligletscher in 1946 will likely soon be released from the ice close to the place where pieces have emerged in recent years.
Dimitri Osmont, Sandra Brugger, Anina Gilgen, Helga Weber, Michael Sigl, Robin L. Modini, Christoph Schwörer, Willy Tinner, Stefan Wunderle, and Margit Schwikowski
The Cryosphere, 14, 3731–3745, https://doi.org/10.5194/tc-14-3731-2020, https://doi.org/10.5194/tc-14-3731-2020, 2020
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In this interdisciplinary case study, we were able to link biomass burning emissions from the June 2017 wildfires in Portugal to their deposition in the snowpack at Jungfraujoch, Swiss Alps. We analysed black carbon and charcoal in the snowpack, calculated backward trajectories, and monitored the fire evolution by remote sensing. Such case studies help to understand the representativity of biomass burning records in ice cores and how biomass burning tracers are archived in the snowpack.
Bronwen L. Konecky, Nicholas P. McKay, Olga V. Churakova (Sidorova), Laia Comas-Bru, Emilie P. Dassié, Kristine L. DeLong, Georgina M. Falster, Matt J. Fischer, Matthew D. Jones, Lukas Jonkers, Darrell S. Kaufman, Guillaume Leduc, Shreyas R. Managave, Belen Martrat, Thomas Opel, Anais J. Orsi, Judson W. Partin, Hussein R. Sayani, Elizabeth K. Thomas, Diane M. Thompson, Jonathan J. Tyler, Nerilie J. Abram, Alyssa R. Atwood, Olivier Cartapanis, Jessica L. Conroy, Mark A. Curran, Sylvia G. Dee, Michael Deininger, Dmitry V. Divine, Zoltán Kern, Trevor J. Porter, Samantha L. Stevenson, Lucien von Gunten, and Iso2k Project Members
Earth Syst. Sci. Data, 12, 2261–2288, https://doi.org/10.5194/essd-12-2261-2020, https://doi.org/10.5194/essd-12-2261-2020, 2020
Shugui Hou, Wangbin Zhang, Hongxi Pang, Shuang-Ye Wu, Theo M. Jenk, Margit Schwikowski, and Yetang Wang
The Cryosphere, 13, 1743–1752, https://doi.org/10.5194/tc-13-1743-2019, https://doi.org/10.5194/tc-13-1743-2019, 2019
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The apparent discrepancy between the Holocene δ18O records of the Guliya and the Chongce ice cores may be attributed to a possible misinterpretation of the Guliya ice core chronology.
François Klein, Nerilie J. Abram, Mark A. J. Curran, Hugues Goosse, Sentia Goursaud, Valérie Masson-Delmotte, Andrew Moy, Raphael Neukom, Anaïs Orsi, Jesper Sjolte, Nathan Steiger, Barbara Stenni, and Martin Werner
Clim. Past, 15, 661–684, https://doi.org/10.5194/cp-15-661-2019, https://doi.org/10.5194/cp-15-661-2019, 2019
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Antarctic temperature changes over the past millennia have been reconstructed from isotope records in ice cores in several studies. However, the link between both variables is complex. Here, we investigate the extent to which this affects the robustness of temperature reconstructions using pseudoproxy and data assimilation experiments. We show that the reconstruction skill is limited, especially at the regional scale, due to a weak and nonstationary covariance between δ18O and temperature.
Chris S. M. Turney, Helen V. McGregor, Pierre Francus, Nerilie Abram, Michael N. Evans, Hugues Goosse, Lucien von Gunten, Darrell Kaufman, Hans Linderholm, Marie-France Loutre, and Raphael Neukom
Clim. Past, 15, 611–615, https://doi.org/10.5194/cp-15-611-2019, https://doi.org/10.5194/cp-15-611-2019, 2019
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This PAGES (Past Global Changes) 2k (climate of the past 2000 years working group) special issue of Climate of the Past brings together the latest understanding of regional change and impacts from PAGES 2k groups across a range of proxies and regions. The special issue has emerged from a need to determine the magnitude and rate of change of regional and global climate beyond the timescales accessible within the observational record.
Dimitri Osmont, Michael Sigl, Anja Eichler, Theo M. Jenk, and Margit Schwikowski
Clim. Past, 15, 579–592, https://doi.org/10.5194/cp-15-579-2019, https://doi.org/10.5194/cp-15-579-2019, 2019
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We present the first black carbon (BC) ice-core record from the Andes (Illimani, Bolivia). It spans the entire Holocene and reflects biomass burning emissions from the Amazon Basin, with high (low) concentrations during warm–dry (wet–cold) periods. The highest fire activity occurred during the Holocene Climatic Optimum (7000–3000 BCE). Recent BC levels, increasing since 1730 CE, do not exceed those of the Medieval Warm Period. The contribution from industrial and traffic emissions remains minor.
Luca Naitza, Davide Putero, Angela Marinoni, Francescopiero Calzolari, Fabrizio Roccato, Maurizio Busetto, Damiano Sferlazzo, Eleonora Aruffo, Piero Di Carlo, Mariantonia Bencardino, Francesco D'Amore, Francesca Sprovieri, Nicola Pirrone, Federico Dallo, Jacopo Gabrieli, Massimiliano Vardè, Carlo Barbante, Paolo Bonasoni, and Paolo Cristofanelli
Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2018-245, https://doi.org/10.5194/amt-2018-245, 2018
Revised manuscript not accepted
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We implemented a prototype of a centralized system to support atmospheric observatories in data production and submission. By using the “R” Language, for several near-surface ECVs, we developed specific routines for data filtering, flagging, formatting, and creation of data products for detecting instrumental problems or special atmospheric events. Our effort would improve atmospheric data quality, accelerate the process of data submission and make the data flagging more “objective".
Dimitri Osmont, Isabel A. Wendl, Loïc Schmidely, Michael Sigl, Carmen P. Vega, Elisabeth Isaksson, and Margit Schwikowski
Atmos. Chem. Phys., 18, 12777–12795, https://doi.org/10.5194/acp-18-12777-2018, https://doi.org/10.5194/acp-18-12777-2018, 2018
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This study presents the first long-term and high-resolution refractory black carbon (rBC) ice core record from Svalbard, spanning the last 800 years. Our results show that rBC has had a predominant anthropogenic origin since the beginning of the Industrial Revolution in Europe and that rBC concentrations have been declining in the last 40 years. We discuss the impact of 20th century snowmelt on our record. We reconstruct biomass burning trends prior to 1800 by using a multi-proxy approach.
Anina Gilgen, Carole Adolf, Sandra O. Brugger, Luisa Ickes, Margit Schwikowski, Jacqueline F. N. van Leeuwen, Willy Tinner, and Ulrike Lohmann
Atmos. Chem. Phys., 18, 11813–11829, https://doi.org/10.5194/acp-18-11813-2018, https://doi.org/10.5194/acp-18-11813-2018, 2018
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Microscopic charcoal particles are fire-specific tracers, which are presently the primary source for reconstructing past fire activity. In this study, we implement microscopic charcoal particles into a global aerosol–climate model to better understand the transport of charcoal on a large scale. We find that the model captures a significant portion of the spatial variability but fails to reproduce the extreme variability observed in the charcoal data.
Shugui Hou, Theo M. Jenk, Wangbin Zhang, Chaomin Wang, Shuangye Wu, Yetang Wang, Hongxi Pang, and Margit Schwikowski
The Cryosphere, 12, 2341–2348, https://doi.org/10.5194/tc-12-2341-2018, https://doi.org/10.5194/tc-12-2341-2018, 2018
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We present multiple lines of evidence indicating that the Chongce ice cores drilled from the northwestern Tibetan Plateau reaches back only to the early Holocene. This result is at least, 1 order of magnitude younger than the nearby Guliya ice core (~30 km away from the Chongce ice core drilling site) but similar to other Tibetan ice cores. Thus it is necessary to explore multiple dating techniques to confirm the age ranges of the Tibetan ice cores.
Mackenzie M. Grieman, Murat Aydin, Elisabeth Isaksson, Margit Schwikowski, and Eric S. Saltzman
Clim. Past, 14, 637–651, https://doi.org/10.5194/cp-14-637-2018, https://doi.org/10.5194/cp-14-637-2018, 2018
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This study presents organic acid levels in an ice core from Svalbard over the past 800 years. These acids are produced from wildfire emissions and transported as aerosol. Organic acid levels are high early in the record and decline until the 20th century. Siberia and Europe are likely the primary source regions of the fire emissions. The data are similar to those from a Siberian ice core prior to 1400 CE. The timing of the divergence after 1400 CE is similar to a shift in North Atlantic climate.
Carmen Paulina Vega, Elisabeth Isaksson, Elisabeth Schlosser, Dmitry Divine, Tõnu Martma, Robert Mulvaney, Anja Eichler, and Margit Schwikowski-Gigar
The Cryosphere, 12, 1681–1697, https://doi.org/10.5194/tc-12-1681-2018, https://doi.org/10.5194/tc-12-1681-2018, 2018
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Ions were measured in firn and ice cores from Fimbul Ice Shelf, Antarctica, to evaluate sea-salt loads. A significant sixfold increase in sea salts was found in the S100 core after 1950s which suggests that it contains a more local sea-salt signal, dominated by processes during sea-ice formation in the neighbouring waters. In contrast, firn cores from three ice rises register the larger-scale signal of atmospheric flow conditions and transport of sea-salt aerosols produced over open water.
Lauren Marshall, Anja Schmidt, Matthew Toohey, Ken S. Carslaw, Graham W. Mann, Michael Sigl, Myriam Khodri, Claudia Timmreck, Davide Zanchettin, William T. Ball, Slimane Bekki, James S. A. Brooke, Sandip Dhomse, Colin Johnson, Jean-Francois Lamarque, Allegra N. LeGrande, Michael J. Mills, Ulrike Niemeier, James O. Pope, Virginie Poulain, Alan Robock, Eugene Rozanov, Andrea Stenke, Timofei Sukhodolov, Simone Tilmes, Kostas Tsigaridis, and Fiona Tummon
Atmos. Chem. Phys., 18, 2307–2328, https://doi.org/10.5194/acp-18-2307-2018, https://doi.org/10.5194/acp-18-2307-2018, 2018
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We use four global aerosol models to compare the simulated sulfate deposition from the 1815 Mt. Tambora eruption to ice core records. Inter-model volcanic sulfate deposition differs considerably. Volcanic sulfate deposited on polar ice sheets is used to estimate the atmospheric sulfate burden and subsequently radiative forcing of historic eruptions. Our results suggest that deriving such relationships from model simulations may be associated with greater uncertainties than previously thought.
Barbara Stenni, Mark A. J. Curran, Nerilie J. Abram, Anais Orsi, Sentia Goursaud, Valerie Masson-Delmotte, Raphael Neukom, Hugues Goosse, Dmitry Divine, Tas van Ommen, Eric J. Steig, Daniel A. Dixon, Elizabeth R. Thomas, Nancy A. N. Bertler, Elisabeth Isaksson, Alexey Ekaykin, Martin Werner, and Massimo Frezzotti
Clim. Past, 13, 1609–1634, https://doi.org/10.5194/cp-13-1609-2017, https://doi.org/10.5194/cp-13-1609-2017, 2017
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Within PAGES Antarctica2k, we build an enlarged database of ice core water stable isotope records. We produce isotopic composites and temperature reconstructions since 0 CE for seven distinct Antarctic regions. We find a significant cooling trend from 0 to 1900 CE across all regions. Since 1900 CE, significant warming trends are identified for three regions. Only for the Antarctic Peninsula is this most recent century-scale trend unusual in the context of last-2000-year natural variability.
Johann H. Jungclaus, Edouard Bard, Mélanie Baroni, Pascale Braconnot, Jian Cao, Louise P. Chini, Tania Egorova, Michael Evans, J. Fidel González-Rouco, Hugues Goosse, George C. Hurtt, Fortunat Joos, Jed O. Kaplan, Myriam Khodri, Kees Klein Goldewijk, Natalie Krivova, Allegra N. LeGrande, Stephan J. Lorenz, Jürg Luterbacher, Wenmin Man, Amanda C. Maycock, Malte Meinshausen, Anders Moberg, Raimund Muscheler, Christoph Nehrbass-Ahles, Bette I. Otto-Bliesner, Steven J. Phipps, Julia Pongratz, Eugene Rozanov, Gavin A. Schmidt, Hauke Schmidt, Werner Schmutz, Andrew Schurer, Alexander I. Shapiro, Michael Sigl, Jason E. Smerdon, Sami K. Solanki, Claudia Timmreck, Matthew Toohey, Ilya G. Usoskin, Sebastian Wagner, Chi-Ju Wu, Kok Leng Yeo, Davide Zanchettin, Qiong Zhang, and Eduardo Zorita
Geosci. Model Dev., 10, 4005–4033, https://doi.org/10.5194/gmd-10-4005-2017, https://doi.org/10.5194/gmd-10-4005-2017, 2017
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Climate model simulations covering the last millennium provide context for the evolution of the modern climate and for the expected changes during the coming centuries. They can help identify plausible mechanisms underlying palaeoclimatic reconstructions. Here, we describe the forcing boundary conditions and the experimental protocol for simulations covering the pre-industrial millennium. We describe the PMIP4 past1000 simulations as contributions to CMIP6 and additional sensitivity experiments.
Matthew Toohey and Michael Sigl
Earth Syst. Sci. Data, 9, 809–831, https://doi.org/10.5194/essd-9-809-2017, https://doi.org/10.5194/essd-9-809-2017, 2017
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Based on ice core sulfate records from Greenland and Antarctica, the eVolv2k database provides volcanic stratospheric sulfur injection estimates from 500 BCE to 1900 CE along with reconstructed aerosol optical properties needed for climate model simulations. The eVolv2k database constitutes a significant update to prior ice-core-based volcanic forcing reconstructions for climate models, improving the accuracy of volcanic forcing, especially before 1250 CE, and extending the record by 1000 years.
Juliana D'Andrilli, Christine M. Foreman, Michael Sigl, John C. Priscu, and Joseph R. McConnell
Clim. Past, 13, 533–544, https://doi.org/10.5194/cp-13-533-2017, https://doi.org/10.5194/cp-13-533-2017, 2017
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Climate-driven trends in fluorescent organic matter (OM) markers from Antarctic ice cores revealed fluctuations over 21.0 kyr, reflecting environmental shifts as a result of global ecosystem response in a warming climate. Precursors of lignin-like fluorescent chemical species were detected as OM markers from the Last Glacial Maximum to the mid-Holocene. Holocene ice contained the most complex lignin-like fluorescent OM markers. Thus, ice cores contain paleoecological OM markers of Earth’s past.
Mackenzie M. Grieman, Murat Aydin, Diedrich Fritzsche, Joseph R. McConnell, Thomas Opel, Michael Sigl, and Eric S. Saltzman
Clim. Past, 13, 395–410, https://doi.org/10.5194/cp-13-395-2017, https://doi.org/10.5194/cp-13-395-2017, 2017
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Wildfires impact ecosystems, climate, and atmospheric chemistry. Records that predate instrumental records and industrialization are needed to study the climatic controls on biomass burning. In this study, we analyzed organic chemicals produced from burning of plant matter that were preserved in an ice core from the Eurasian Arctic. These chemicals are elevated during three periods that have similar timing to climate variability. This is the first millennial-scale record of these chemicals.
Pascal Bohleber, Leo Sold, Douglas R. Hardy, Margit Schwikowski, Patrick Klenk, Andrea Fischer, Pascal Sirguey, Nicolas J. Cullen, Mariusz Potocki, Helene Hoffmann, and Paul Mayewski
The Cryosphere, 11, 469–482, https://doi.org/10.5194/tc-11-469-2017, https://doi.org/10.5194/tc-11-469-2017, 2017
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Our study is the first to use ground-penetrating radar (GPR) to investigate ice thickness and internal layering at Kilimanjaro’s largest ice body, the Northern Ice Field (NIF). For monitoring the ongoing ice loss, our ice thickness soundings allowed us to estimate the total ice volume remaining at NIF's southern portion. Englacial GPR reflections indicate undisturbed layers within NIF's center and provide a first link between age information obtained from ice coring and vertical wall sampling.
Olivia J. Maselli, Nathan J. Chellman, Mackenzie Grieman, Lawrence Layman, Joseph R. McConnell, Daniel Pasteris, Rachael H. Rhodes, Eric Saltzman, and Michael Sigl
Clim. Past, 13, 39–59, https://doi.org/10.5194/cp-13-39-2017, https://doi.org/10.5194/cp-13-39-2017, 2017
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We analysed two Greenland ice cores for methanesulfonate (MSA) and bromine (Br) and concluded that both species are suitable proxies for local sea ice conditions. Interpretation of the records reveals that there have been sharp declines in sea ice in these areas in the past 250 years. However, at both sites the Br record deviates from MSA during the industrial period, raising questions about the value of Br as a sea ice proxy during recent periods of high, industrial, atmospheric acid pollution.
Rune Strand Ødegård, Atle Nesje, Ketil Isaksen, Liss Marie Andreassen, Trond Eiken, Margit Schwikowski, and Chiara Uglietti
The Cryosphere, 11, 17–32, https://doi.org/10.5194/tc-11-17-2017, https://doi.org/10.5194/tc-11-17-2017, 2017
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Despite numerous spectacular archaeological discoveries worldwide related to melting ice, governing processes related to ice patch development are still largely unexplored. We present new results from Jotunheimen in central southern Norway showing that the Juvfonne ice patch has existed continuously since ca. 7600 cal years BP. This is the oldest dating of ice in mainland Norway. Moss mats along the margin of Juvfonne in 2014 were covered by the expanding ice patch about 2000 years ago.
Chiara Uglietti, Alexander Zapf, Theo Manuel Jenk, Michael Sigl, Sönke Szidat, Gary Salazar, and Margit Schwikowski
The Cryosphere, 10, 3091–3105, https://doi.org/10.5194/tc-10-3091-2016, https://doi.org/10.5194/tc-10-3091-2016, 2016
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A meaningful interpretation of the climatic history contained in ice cores requires a precise chronology. For dating the older and deeper part of the glaciers, radiocarbon analysis can be used when organic matter such as plant or insect fragments are found in the ice. Since this happens rarely, a complementary dating tool, based on radiocarbon dating of the insoluble fraction of carbonaceous aerosols entrapped in the ice, allows for ice dating between 200 and more than 10 000 years.
Paolo Gabrielli, Carlo Barbante, Giuliano Bertagna, Michele Bertó, Daniel Binder, Alberto Carton, Luca Carturan, Federico Cazorzi, Giulio Cozzi, Giancarlo Dalla Fontana, Mary Davis, Fabrizio De Blasi, Roberto Dinale, Gianfranco Dragà, Giuliano Dreossi, Daniela Festi, Massimo Frezzotti, Jacopo Gabrieli, Stephan P. Galos, Patrick Ginot, Petra Heidenwolf, Theo M. Jenk, Natalie Kehrwald, Donald Kenny, Olivier Magand, Volkmar Mair, Vladimir Mikhalenko, Ping Nan Lin, Klaus Oeggl, Gianni Piffer, Mirko Rinaldi, Ulrich Schotterer, Margit Schwikowski, Roberto Seppi, Andrea Spolaor, Barbara Stenni, David Tonidandel, Chiara Uglietti, Victor Zagorodnov, Thomas Zanoner, and Piero Zennaro
The Cryosphere, 10, 2779–2797, https://doi.org/10.5194/tc-10-2779-2016, https://doi.org/10.5194/tc-10-2779-2016, 2016
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New ice cores were extracted from Alto dell'Ortles, the highest glacier of South Tyrol in the Italian Alps, to check whether prehistoric ice, which is coeval to the famous 5300-yr-old Tyrolean Iceman, is still preserved in this region. Dating of the ice cores confirms the hypothesis and indicates the drilling site has been glaciated since the end of the Northern Hemisphere Climatic Optimum (7000 yrs BP). We also infer that an unprecedented acceleration of the glacier flow has recently begun.
Carmen P. Vega, Elisabeth Schlosser, Dmitry V. Divine, Jack Kohler, Tõnu Martma, Anja Eichler, Margit Schwikowski, and Elisabeth Isaksson
The Cryosphere, 10, 2763–2777, https://doi.org/10.5194/tc-10-2763-2016, https://doi.org/10.5194/tc-10-2763-2016, 2016
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Surface mass balance and water stable isotopes from firn cores on three ice rises at Fimbul Ice Shelf are reported. The results suggest that the ice rises are suitable sites for the retrieval of longer firn and ice cores. The first deuterium excess data for the area suggests a possible role of seasonal moisture transport changes on the annual isotopic signal. Large-scale atmospheric circulation patterns most likely provide the dominant influence on water stable isotope ratios at the sites.
Michel Legrand, Joseph McConnell, Hubertus Fischer, Eric W. Wolff, Susanne Preunkert, Monica Arienzo, Nathan Chellman, Daiana Leuenberger, Olivia Maselli, Philip Place, Michael Sigl, Simon Schüpbach, and Mike Flannigan
Clim. Past, 12, 2033–2059, https://doi.org/10.5194/cp-12-2033-2016, https://doi.org/10.5194/cp-12-2033-2016, 2016
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Here, we review previous attempts made to reconstruct past forest fire using chemical signals recorded in Greenland ice. We showed that the Greenland ice records of ammonium, found to be a good fire proxy, consistently indicate changing fire activity in Canada in response to past climatic conditions that occurred since the last 15 000 years, including the Little Ice Age and the last large climatic transition.
Theo Manuel Jenk, Mauro Rubino, David Etheridge, Viorela Gabriela Ciobanu, and Thomas Blunier
Atmos. Meas. Tech., 9, 3687–3706, https://doi.org/10.5194/amt-9-3687-2016, https://doi.org/10.5194/amt-9-3687-2016, 2016
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Atmospheric CO2 and δ13C-CO2 records from polar ice cores provide important constraints on the natural carbon cycle variability. Still, data exist only from a limited number of sampling sites and time periods due to demanding analytical challenges. Additional analytical state-of-the-art resources are desirable. This study describes such a new facility. Its analytical performance and new approaches for dealing with procedural blank contribution and analytical outliers are discussed in detail.
Carmen P. Vega, Veijo A. Pohjola, Emilie Beaudon, Björn Claremar, Ward J. J. van Pelt, Rickard Pettersson, Elisabeth Isaksson, Tõnu Martma, Margit Schwikowski, and Carl E. Bøggild
The Cryosphere, 10, 961–976, https://doi.org/10.5194/tc-10-961-2016, https://doi.org/10.5194/tc-10-961-2016, 2016
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To quantify post-depositional relocation of major ions by meltwater in snow and firn at Lomonosovfonna, Svalbard, consecutive ice cores drilled at this site were used to construct a synthetic core. The relocation length of most of the ions was on the order of 1 m between 2007 and 2010. Considering the ionic relocation lengths and annual melt percentages, we estimate that the atmospheric ionic signal remains preserved in recently drilled Lomonosovfonna ice cores at an annual or bi-annual resolution.
Rachael H. Rhodes, Xavier Faïn, Edward J. Brook, Joseph R. McConnell, Olivia J. Maselli, Michael Sigl, Jon Edwards, Christo Buizert, Thomas Blunier, Jérôme Chappellaz, and Johannes Freitag
Clim. Past, 12, 1061–1077, https://doi.org/10.5194/cp-12-1061-2016, https://doi.org/10.5194/cp-12-1061-2016, 2016
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Local artifacts in ice core methane data are superimposed on consistent records of past atmospheric variability. These artifacts are not related to past atmospheric history and care should be taken to avoid interpreting them as such. By investigating five polar ice cores from sites with different conditions, we relate isolated methane spikes to melt layers and decimetre-scale variations as "trapping signal" associated with a difference in timing of air bubble closure in adjacent firn layers.
Michael Sigl, Tyler J. Fudge, Mai Winstrup, Jihong Cole-Dai, David Ferris, Joseph R. McConnell, Ken C. Taylor, Kees C. Welten, Thomas E. Woodruff, Florian Adolphi, Marion Bisiaux, Edward J. Brook, Christo Buizert, Marc W. Caffee, Nelia W. Dunbar, Ross Edwards, Lei Geng, Nels Iverson, Bess Koffman, Lawrence Layman, Olivia J. Maselli, Kenneth McGwire, Raimund Muscheler, Kunihiko Nishiizumi, Daniel R. Pasteris, Rachael H. Rhodes, and Todd A. Sowers
Clim. Past, 12, 769–786, https://doi.org/10.5194/cp-12-769-2016, https://doi.org/10.5194/cp-12-769-2016, 2016
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Here we present a chronology (WD2014) for the upper part (0–2850 m; 31.2 ka BP) of the West Antarctic Ice Sheet (WAIS) Divide ice core, which is based on layer counting of distinctive annual cycles preserved in the elemental, chemical and electrical conductivity records. We validated the chronology by comparing it to independent high-accuracy, absolutely dated chronologies. Given its demonstrated high accuracy, WD2014 can become a reference chronology for the Southern Hemisphere.
Tessa R. Vance, Jason L. Roberts, Andrew D. Moy, Mark A. J. Curran, Carly R. Tozer, Ailie J. E. Gallant, Nerilie J. Abram, Tas D. van Ommen, Duncan A. Young, Cyril Grima, Don D. Blankenship, and Martin J. Siegert
Clim. Past, 12, 595–610, https://doi.org/10.5194/cp-12-595-2016, https://doi.org/10.5194/cp-12-595-2016, 2016
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This study details a systematic approach to finding a new high-resolution East Antarctic ice core site. The study initially outlines seven criteria that a new site must fulfil, encompassing specific accumulation, ice dynamics and atmospheric circulation aspects. We then use numerous techniques including Antarctic surface mass balance syntheses, ground-truthing of satellite data by airborne radar surveys and reanalysis products to pinpoint promising regions.
C. Müller-Tautges, A. Eichler, M. Schwikowski, G. B. Pezzatti, M. Conedera, and T. Hoffmann
Atmos. Chem. Phys., 16, 1029–1043, https://doi.org/10.5194/acp-16-1029-2016, https://doi.org/10.5194/acp-16-1029-2016, 2016
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The paper focuses on the determination and interpretation of historic records of organic compounds in an ice core from Grenzgletscher in the southern Swiss Alps, covering the time period from 1942 to 1993. The resulting long-term records of organic species were found to be influenced by the forest fire history in southern Switzerland, anthropogenic emissions, as well as changing mineral dust transport to the drilling site.
J. Gabbi, M. Huss, A. Bauder, F. Cao, and M. Schwikowski
The Cryosphere, 9, 1385–1400, https://doi.org/10.5194/tc-9-1385-2015, https://doi.org/10.5194/tc-9-1385-2015, 2015
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Light-absorbing impurities in snow and ice increase the absorption of solar radiation and thus enhance melting. We investigated the effect of Saharan dust and black carbon on the mass balance of an Alpine glacier over 1914-2014. Snow impurities increased melt by 15-19% depending on the location on the glacier. From the accumulation area towards the equilibrium line, the effect of impurities increased as more frequent years with negative mass balance led to a re-exposure of dust-enriched layers.
I. A. Wendl, A. Eichler, E. Isaksson, T. Martma, and M. Schwikowski
Atmos. Chem. Phys., 15, 7287–7300, https://doi.org/10.5194/acp-15-7287-2015, https://doi.org/10.5194/acp-15-7287-2015, 2015
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Nitrate and ammonium ice core records from Lomonosovfonna, Svalbard, indicated anthropogenic pollution from Eurasia as major source during the 20th century. In pre-industrial times nitrate is correlated with methane sulfonate, which we explain with a fertilising effect, presumably triggered by enhanced atmospheric nitrogen input to the ocean. Eurasia was likely the main source area also of pre-industrial nitrate, but for ammonium, biogenic emissions from Siberian boreal forests were dominant.
S. Kang, F. Wang, U. Morgenstern, Y. Zhang, B. Grigholm, S. Kaspari, M. Schwikowski, J. Ren, T. Yao, D. Qin, and P. A. Mayewski
The Cryosphere, 9, 1213–1222, https://doi.org/10.5194/tc-9-1213-2015, https://doi.org/10.5194/tc-9-1213-2015, 2015
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L. Sold, M. Huss, A. Eichler, M. Schwikowski, and M. Hoelzle
The Cryosphere, 9, 1075–1087, https://doi.org/10.5194/tc-9-1075-2015, https://doi.org/10.5194/tc-9-1075-2015, 2015
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This study presents a method for estimating annual accumulation rates on a temperate Alpine glacier based on the interpretation of internal reflection horizons in helicopter-borne ground-penetrating radar (GPR) data. In combination with a simple model for firn densification and refreezing of meltwater, GPR can be used not only to complement existing mass balance monitoring programmes but also to retrospectively extend newly initiated time series.
Y.-L. Zhang, R.-J. Huang, I. El Haddad, K.-F. Ho, J.-J. Cao, Y. Han, P. Zotter, C. Bozzetti, K. R. Daellenbach, F. Canonaco, J. G. Slowik, G. Salazar, M. Schwikowski, J. Schnelle-Kreis, G. Abbaszade, R. Zimmermann, U. Baltensperger, A. S. H. Prévôt, and S. Szidat
Atmos. Chem. Phys., 15, 1299–1312, https://doi.org/10.5194/acp-15-1299-2015, https://doi.org/10.5194/acp-15-1299-2015, 2015
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Source apportionment of fine carbonaceous aerosols using radiocarbon and other organic markers measurements during 2013 winter haze episodes was conducted at four megacities in China. Our results demonstrate that fossil emissions predominate EC with a mean contribution of 75±8%, whereas non-fossil sources account for 55±10% of OC; and the increment of TC on heavily polluted days was mainly driven by the increase of secondary OC from both fossil-fuel and non-fossil emissions.
P. Zotter, V. G. Ciobanu, Y. L. Zhang, I. El-Haddad, M. Macchia, K. R. Daellenbach, G. A. Salazar, R.-J. Huang, L. Wacker, C. Hueglin, A. Piazzalunga, P. Fermo, M. Schwikowski, U. Baltensperger, S. Szidat, and A. S. H. Prévôt
Atmos. Chem. Phys., 14, 13551–13570, https://doi.org/10.5194/acp-14-13551-2014, https://doi.org/10.5194/acp-14-13551-2014, 2014
I. A. Wendl, J. A. Menking, R. Färber, M. Gysel, S. D. Kaspari, M. J. G. Laborde, and M. Schwikowski
Atmos. Meas. Tech., 7, 2667–2681, https://doi.org/10.5194/amt-7-2667-2014, https://doi.org/10.5194/amt-7-2667-2014, 2014
S. Kaspari, T. H. Painter, M. Gysel, S. M. Skiles, and M. Schwikowski
Atmos. Chem. Phys., 14, 8089–8103, https://doi.org/10.5194/acp-14-8089-2014, https://doi.org/10.5194/acp-14-8089-2014, 2014
I. Mariani, A. Eichler, T. M. Jenk, S. Brönnimann, R. Auchmann, M. C. Leuenberger, and M. Schwikowski
Clim. Past, 10, 1093–1108, https://doi.org/10.5194/cp-10-1093-2014, https://doi.org/10.5194/cp-10-1093-2014, 2014
T. Papina, T. Blyakharchuk, A. Eichler, N. Malygina, E. Mitrofanova, and M. Schwikowski
Clim. Past, 9, 2399–2411, https://doi.org/10.5194/cp-9-2399-2013, https://doi.org/10.5194/cp-9-2399-2013, 2013
M. Schwikowski, M. Schläppi, P. Santibañez, A. Rivera, and G. Casassa
The Cryosphere, 7, 1635–1644, https://doi.org/10.5194/tc-7-1635-2013, https://doi.org/10.5194/tc-7-1635-2013, 2013
S. Brönnimann, I. Mariani, M. Schwikowski, R. Auchmann, and A. Eichler
Clim. Past, 9, 2013–2022, https://doi.org/10.5194/cp-9-2013-2013, https://doi.org/10.5194/cp-9-2013-2013, 2013
P. Vallelonga, C. Barbante, G. Cozzi, J. Gabrieli, S. Schüpbach, A. Spolaor, and C. Turetta
Clim. Past, 9, 597–604, https://doi.org/10.5194/cp-9-597-2013, https://doi.org/10.5194/cp-9-597-2013, 2013
Related subject area
Discipline: Glaciers | Subject: Alpine Glaciers
Unprecedented 21st century glacier loss on Mt. Hood, Oregon, USA
Distributed surface mass balance of an avalanche-fed glacier
Mapping and characterization of avalanches on mountain glaciers with Sentinel-1 satellite imagery
Brief communication: Recent estimates of glacier mass loss for western North America from laser altimetry
The Aneto glacier's (Central Pyrenees) evolution from 1981 to 2022: ice loss observed from historic aerial image photogrammetry and remote sensing techniques
Modelling point mass balance for the glaciers of the Central European Alps using machine learning techniques
Consistent histories of anthropogenic western European air pollution preserved in different Alpine ice cores
Brief communication: Non-linear sensitivity of glacier mass balance to climate attested by temperature-index models
Halving of Swiss glacier volume since 1931 observed from terrestrial image photogrammetry
Land- to lake-terminating transition triggers dynamic thinning of a Bhutanese glacier
Brief communication: A framework to classify glaciers for water resource evaluation and management in the Southern Andes
Strong acceleration of glacier area loss in the Greater Caucasus between 2000 and 2020
Ice volume and basal topography estimation using geostatistical methods and ground-penetrating radar measurements: application to the Tsanfleuron and Scex Rouge glaciers, Swiss Alps
Significant mass loss in the accumulation area of the Adamello glacier indicated by the chronology of a 46 m ice core
Brief communication: Do 1.0, 1.5, or 2.0 °C matter for the future evolution of Alpine glaciers?
A new automatic approach for extracting glacier centerlines based on Euclidean allocation
Spatially and temporally resolved ice loss in High Mountain Asia and the Gulf of Alaska observed by CryoSat-2 swath altimetry between 2010 and 2019
Crystallographic analysis of temperate ice on Rhonegletscher, Swiss Alps
Debris cover and the thinning of Kennicott Glacier, Alaska: in situ measurements, automated ice cliff delineation and distributed melt estimates
Small-scale spatial variability in bare-ice reflectance at Jamtalferner, Austria
Numerical modeling of the dynamics of the Mer de Glace glacier, French Alps: comparison with past observations and forecasting of near-future evolution
Monitoring the seasonal changes of an englacial conduit network using repeated ground-penetrating radar measurements
Possible biases in scaling-based estimates of glacier change: a case study in the Himalaya
Spatial and temporal variations in glacier aerodynamic surface roughness during the melting season, as estimated at the August-one ice cap, Qilian mountains, China
Strong changes in englacial temperatures despite insignificant changes in ice thickness at Dôme du Goûter glacier (Mont Blanc area)
Supra-glacial debris cover changes in the Greater Caucasus from 1986 to 2014
Glacier thickness estimations of alpine glaciers using data and modeling constraints
Unravelling the evolution of Zmuttgletscher and its debris cover since the end of the Little Ice Age
Modelling the future evolution of glaciers in the European Alps under the EURO-CORDEX RCM ensemble
Robust uncertainty assessment of the spatio-temporal transferability of glacier mass and energy balance models
Impacts of topographic shading on direct solar radiation for valley glaciers in complex topography
Iron oxides in the cryoconite of glaciers on the Tibetan Plateau: abundance, speciation and implications
Numerical reconstructions of the flow and basal conditions of the Rhine glacier, European Central Alps, at the Last Glacial Maximum
Nicolas Bakken-French, Stephen J. Boyer, B. Clay Southworth, Megan Thayne, Dylan H. Rood, and Anders E. Carlson
The Cryosphere, 18, 4517–4530, https://doi.org/10.5194/tc-18-4517-2024, https://doi.org/10.5194/tc-18-4517-2024, 2024
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Repeat photography, field mapping, and remote sensing find that glaciers on Mt. Hood, Oregon, have lost about 25 % of their area in the first 2 decades of the 21st century and 17 % of their area in the last 7–8 years. The 21st century recession rate is more than 3 times faster than the 20th century average and 1.9 times faster than the fastest period of retreat within the 20th century. This unprecedented retreat corresponds to regional summer warming of 1.7–1.8°C relative to the early 1900s.
Marin Kneib, Amaury Dehecq, Adrien Gilbert, Auguste Basset, Evan S. Miles, Guillaume Jouvet, Bruno Jourdain, Etienne Ducasse, Luc Beraud, Antoine Rabatel, Jérémie Mouginot, Guillem Carcanade, Olivier Laarman, Fanny Brun, and Delphine Six
EGUsphere, https://doi.org/10.5194/egusphere-2024-1733, https://doi.org/10.5194/egusphere-2024-1733, 2024
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Avalanches contribute to increasing the accumulation on mountain glaciers by redistributing snow from surrounding mountains slopes. Here we quantified the contribution of avalanches to the mass balance of Argentière Glacier in the French Alps, by combining satellite and field observations to model the glacier dynamics. We show that the contribution of avalanches locally increases the accumulation by 60-70% and that accounting for this effect results in less ice loss by the end of the century.
Marin Kneib, Amaury Dehecq, Fanny Brun, Fatima Karbou, Laurane Charrier, Silvan Leinss, Patrick Wagnon, and Fabien Maussion
The Cryosphere, 18, 2809–2830, https://doi.org/10.5194/tc-18-2809-2024, https://doi.org/10.5194/tc-18-2809-2024, 2024
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Avalanches are important for the mass balance of mountain glaciers, but few data exist on where and when they occur and which glaciers they affect the most. We developed an approach to map avalanches over large glaciated areas and long periods of time using satellite radar data. The application of this method to various regions in the Alps and High Mountain Asia reveals the variability of avalanches on these glaciers and provides key data to better represent these processes in glacier models.
Brian Menounos, Alex Gardner, Caitlyn Florentine, and Andrew Fountain
The Cryosphere, 18, 889–894, https://doi.org/10.5194/tc-18-889-2024, https://doi.org/10.5194/tc-18-889-2024, 2024
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Glaciers in western North American outside of Alaska are often overlooked in global studies because their potential to contribute to changes in sea level is small. Nonetheless, these glaciers represent important sources of freshwater, especially during times of drought. We show that these glaciers lost mass at a rate of about 12 Gt yr-1 for about the period 2013–2021; the rate of mass loss over the period 2018–2022 was similar.
Ixeia Vidaller, Eñaut Izagirre, Luis Mariano del Rio, Esteban Alonso-González, Francisco Rojas-Heredia, Enrique Serrano, Ana Moreno, Juan Ignacio López-Moreno, and Jesús Revuelto
The Cryosphere, 17, 3177–3192, https://doi.org/10.5194/tc-17-3177-2023, https://doi.org/10.5194/tc-17-3177-2023, 2023
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The Aneto glacier, the largest glacier in the Pyrenees, has shown continuous surface and ice thickness losses in the last decades. In this study, we examine changes in its surface and ice thickness for 1981–2022 and the remaining ice thickness in 2020. During these 41 years, the glacier has shrunk by 64.7 %, and the ice thickness has decreased by 30.5 m on average. The mean ice thickness in 2022 was 11.9 m, compared to 32.9 m in 1981. The results highlight the critical situation of the glacier.
Ritu Anilkumar, Rishikesh Bharti, Dibyajyoti Chutia, and Shiv Prasad Aggarwal
The Cryosphere, 17, 2811–2828, https://doi.org/10.5194/tc-17-2811-2023, https://doi.org/10.5194/tc-17-2811-2023, 2023
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Our analysis demonstrates the capability of machine learning models in estimating glacier mass balance in terms of performance metrics and dataset availability. Feature importance analysis suggests that ablation features are significant. This is in agreement with the predominantly negative mass balance observations. We show that ensemble tree models typically depict the best performance. However, neural network models are preferable for biased inputs and kernel-based models for smaller datasets.
Anja Eichler, Michel Legrand, Theo M. Jenk, Susanne Preunkert, Camilla Andersson, Sabine Eckhardt, Magnuz Engardt, Andreas Plach, and Margit Schwikowski
The Cryosphere, 17, 2119–2137, https://doi.org/10.5194/tc-17-2119-2023, https://doi.org/10.5194/tc-17-2119-2023, 2023
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We investigate how a 250-year history of the emission of air pollutants (major inorganic aerosol constituents, black carbon, and trace species) is preserved in ice cores from four sites in the European Alps. The observed uniform timing in species-dependent longer-term concentration changes reveals that the different ice-core records provide a consistent, spatially representative signal of the pollution history from western European countries.
Christian Vincent and Emmanuel Thibert
The Cryosphere, 17, 1989–1995, https://doi.org/10.5194/tc-17-1989-2023, https://doi.org/10.5194/tc-17-1989-2023, 2023
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Temperature-index models have been widely used for glacier mass projections in the future. The ability of these models to capture non-linear responses of glacier mass balance (MB) to high deviations in air temperature and solid precipitation has recently been questioned by mass balance simulations employing advanced machine-learning techniques. Here, we confirmed that temperature-index models are capable of detecting non-linear responses of glacier MB to temperature and precipitation changes.
Erik Schytt Mannerfelt, Amaury Dehecq, Romain Hugonnet, Elias Hodel, Matthias Huss, Andreas Bauder, and Daniel Farinotti
The Cryosphere, 16, 3249–3268, https://doi.org/10.5194/tc-16-3249-2022, https://doi.org/10.5194/tc-16-3249-2022, 2022
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How glaciers have responded to climate change over the last 20 years is well-known, but earlier data are much more scarce. We change this in Switzerland by using 22 000 photographs taken from mountain tops between the world wars and find a halving of Swiss glacier volume since 1931. This was done through new automated processing techniques that we created. The data are interesting for more than just glaciers, such as mapping forest changes, landslides, and human impacts on the terrain.
Yota Sato, Koji Fujita, Hiroshi Inoue, Akiko Sakai, and Karma
The Cryosphere, 16, 2643–2654, https://doi.org/10.5194/tc-16-2643-2022, https://doi.org/10.5194/tc-16-2643-2022, 2022
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We investigate fluctuations in Bhutanese lake-terminating glaciers focusing on the dynamics change before and after proglacial lake formation at Thorthormi Glacier (TG) based on photogrammetry, satellite, and GPS surveys. The thinning rate of TG became double compared to before proglacial lake formation, and the flow velocity has also sped up considerably. Those changes would be due to the reduction in longitudinal ice compression by the detachment of the glacier terminus from the end moraine.
Nicole Schaffer and Shelley MacDonell
The Cryosphere, 16, 1779–1791, https://doi.org/10.5194/tc-16-1779-2022, https://doi.org/10.5194/tc-16-1779-2022, 2022
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Over the last 2 decades the importance of Andean glaciers, particularly as water resources, has been recognized in both scientific literature and the public sphere. This has led to the inclusion of glaciers in environmental impact assessment and the development of glacier protection laws. We propose three categories that group glaciers based on their environmental sensitivity to hopefully help facilitate the effective application of these measures and evaluation of water resources in general.
Levan G. Tielidze, Gennady A. Nosenko, Tatiana E. Khromova, and Frank Paul
The Cryosphere, 16, 489–504, https://doi.org/10.5194/tc-16-489-2022, https://doi.org/10.5194/tc-16-489-2022, 2022
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The new Caucasus glacier inventory derived from manual delineation of glacier outlines based on medium-resolution (Landsat, Sentinel) and high-resolution (SPOT) satellite imagery shows the accelerated glacier area loss over the last 2 decades (2000–2020). This new glacier inventory will improve our understanding of climate change impacts at a regional scale and support related modelling studies by providing high-quality validation data.
Alexis Neven, Valentin Dall'Alba, Przemysław Juda, Julien Straubhaar, and Philippe Renard
The Cryosphere, 15, 5169–5186, https://doi.org/10.5194/tc-15-5169-2021, https://doi.org/10.5194/tc-15-5169-2021, 2021
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We present and compare different geostatistical methods for underglacial bedrock interpolation. Variogram-based interpolations are compared with a multipoint statistics approach on both test cases and real glaciers. Using the modeled bedrock, the ice volume for the Scex Rouge and Tsanfleuron glaciers (Swiss Alps) was estimated to be 113.9 ± 1.6 million cubic meters. Complex karstic geomorphological features are reproduced and can be used to improve the precision of underglacial flow estimation.
Daniela Festi, Margit Schwikowski, Valter Maggi, Klaus Oeggl, and Theo Manuel Jenk
The Cryosphere, 15, 4135–4143, https://doi.org/10.5194/tc-15-4135-2021, https://doi.org/10.5194/tc-15-4135-2021, 2021
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In our study we dated a 46 m deep ice core retrieved from the Adamello glacier (Central Italian Alps). We obtained a timescale combining the results of radionuclides 210Pb and 137Cs with annual layer counting derived from pollen and refractory black carbon concentrations. Our results indicate that the surface of the glacier is older than the drilling date of 2016 by about 20 years, therefore revealing that the glacier is at high risk of collapsing under current climate warming conditions.
Loris Compagno, Sarah Eggs, Matthias Huss, Harry Zekollari, and Daniel Farinotti
The Cryosphere, 15, 2593–2599, https://doi.org/10.5194/tc-15-2593-2021, https://doi.org/10.5194/tc-15-2593-2021, 2021
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Recently, discussions have focused on the difference in limiting the increase in global average temperatures to below 1.0, 1.5, or 2.0 °C compared to preindustrial levels. Here, we assess the impacts that such different scenarios would have on both the future evolution of glaciers in the European Alps and the water resources they provide. Our results show that the different temperature targets have important implications for the changes predicted until 2100.
Dahong Zhang, Xiaojun Yao, Hongyu Duan, Shiyin Liu, Wanqin Guo, Meiping Sun, and Dazhi Li
The Cryosphere, 15, 1955–1973, https://doi.org/10.5194/tc-15-1955-2021, https://doi.org/10.5194/tc-15-1955-2021, 2021
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Glacier centerlines are crucial input for many glaciological applications. We propose a new algorithm to derive glacier centerlines and implement the corresponding program in Python language. Application of this method to 48 571 glaciers in the second Chinese glacier inventory automatically yielded the corresponding glacier centerlines with an average computing time of 20.96 s, a success rate of 100 % and a comprehensive accuracy of 94.34 %.
Livia Jakob, Noel Gourmelen, Martin Ewart, and Stephen Plummer
The Cryosphere, 15, 1845–1862, https://doi.org/10.5194/tc-15-1845-2021, https://doi.org/10.5194/tc-15-1845-2021, 2021
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Glaciers and ice caps are currently the largest contributor to sea level rise. Global monitoring of these regions is a challenging task, and significant differences remain between current estimates. This study looks at glacier changes in High Mountain Asia and the Gulf of Alaska using a new technique, which for the first time makes the use of satellite radar altimetry for mapping ice mass loss over mountain glacier regions possible.
Sebastian Hellmann, Johanna Kerch, Ilka Weikusat, Andreas Bauder, Melchior Grab, Guillaume Jouvet, Margit Schwikowski, and Hansruedi Maurer
The Cryosphere, 15, 677–694, https://doi.org/10.5194/tc-15-677-2021, https://doi.org/10.5194/tc-15-677-2021, 2021
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We analyse the orientation of ice crystals in an Alpine glacier and compare this orientation with the ice flow direction. We found that the crystals orient in the direction of the largest stress which is in the flow direction in the upper parts of the glacier and in the vertical direction for deeper zones of the glacier. The grains cluster around this maximum stress direction, in particular four-point maxima, most likely as a result of recrystallisation under relatively warm conditions.
Leif S. Anderson, William H. Armstrong, Robert S. Anderson, and Pascal Buri
The Cryosphere, 15, 265–282, https://doi.org/10.5194/tc-15-265-2021, https://doi.org/10.5194/tc-15-265-2021, 2021
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Many glaciers are thinning rapidly beneath debris cover (loose rock) that reduces melt, including Kennicott Glacier in Alaska. This contradiction has been explained by melt hotspots, such as ice cliffs, scattered within the debris cover. However, at Kennicott Glacier declining ice flow explains the rapid thinning. Through this study, Kennicott Glacier is now the first glacier in Alaska, and the largest glacier globally, where melt across its debris-covered tongue has been rigorously quantified.
Lea Hartl, Lucia Felbauer, Gabriele Schwaizer, and Andrea Fischer
The Cryosphere, 14, 4063–4081, https://doi.org/10.5194/tc-14-4063-2020, https://doi.org/10.5194/tc-14-4063-2020, 2020
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When glaciers become snow-free in summer, darker glacier ice is exposed. The ice surface is darker than snow and absorbs more radiation, which increases ice melt. We measured how much radiation is reflected at different wavelengths in the ablation zone of Jamtalferner, Austria. Due to impurities and water on the ice surface there are large variations in reflectance. Landsat 8 and Sentinel-2 surface reflectance products do not capture the full range of reflectance found on the glacier.
Vincent Peyaud, Coline Bouchayer, Olivier Gagliardini, Christian Vincent, Fabien Gillet-Chaulet, Delphine Six, and Olivier Laarman
The Cryosphere, 14, 3979–3994, https://doi.org/10.5194/tc-14-3979-2020, https://doi.org/10.5194/tc-14-3979-2020, 2020
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Alpine glaciers are retreating at an accelerating rate in a warming climate. Numerical models allow us to study and anticipate these changes, but the performance of a model is difficult to evaluate. So we compared an ice flow model with the long dataset of observations obtained between 1979 and 2015 on Mer de Glace (Mont Blanc area). The model accurately reconstructs the past evolution of the glacier. We simulate the future evolution of Mer de Glace; it could retreat by 2 to 6 km by 2050.
Gregory Church, Melchior Grab, Cédric Schmelzbach, Andreas Bauder, and Hansruedi Maurer
The Cryosphere, 14, 3269–3286, https://doi.org/10.5194/tc-14-3269-2020, https://doi.org/10.5194/tc-14-3269-2020, 2020
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In this field study, we repeated ground-penetrating radar measurements over an active englacial channel network that transports meltwater through the glacier. We successfully imaged the englacial meltwater pathway and were able to delimitate the channel's shape. Meltwater from the glacier can impact the glacier's dynamics if it reaches the ice–bed interface, and therefore monitoring these englacial drainage networks is important to understand how these networks behave throughout a season.
Argha Banerjee, Disha Patil, and Ajinkya Jadhav
The Cryosphere, 14, 3235–3247, https://doi.org/10.5194/tc-14-3235-2020, https://doi.org/10.5194/tc-14-3235-2020, 2020
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Simple models of glacier dynamics based on volume–area scaling underestimate climate sensitivity and response time of glaciers. Consequently, they may predict a faster response and a smaller long-term glacier loss. These biases in scaling models are established theoretically and are analysed in detail by simulating the step response of a set of 703 Himalayan glaciers separately by three different models: a scaling model, a 2-D shallow-ice approximation model, and a linear-response model.
Junfeng Liu, Rensheng Chen, and Chuntan Han
The Cryosphere, 14, 967–984, https://doi.org/10.5194/tc-14-967-2020, https://doi.org/10.5194/tc-14-967-2020, 2020
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Glacier surface roughness during melting season was observed by manual and automatic photogrammetry. Surface roughness was larger at the snow and ice transition zone than in fully snow- or ice-covered areas. Persistent snowfall and rainfall both reduce surface roughness. High or rising turbulent heat as a component of surface energy balance tended to produce a smooth ice surface; low or decreasing turbulent heat tended to produce a rougher surface.
Christian Vincent, Adrien Gilbert, Bruno Jourdain, Luc Piard, Patrick Ginot, Vladimir Mikhalenko, Philippe Possenti, Emmanuel Le Meur, Olivier Laarman, and Delphine Six
The Cryosphere, 14, 925–934, https://doi.org/10.5194/tc-14-925-2020, https://doi.org/10.5194/tc-14-925-2020, 2020
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We observed very low glacier thickness changes over the last decades at very-high-elevation glaciated areas on Mont Blanc. Conversely, measurements performed in deep boreholes since 1994 reveal strong changes in englacial temperature reaching 1.5 °C at a depth of 50 m. We conclude that at such very high elevations, current changes in climate do not lead to visible changes in glacier thickness but cause invisible changes within the glacier in terms of englacial temperatures.
Levan G. Tielidze, Tobias Bolch, Roger D. Wheate, Stanislav S. Kutuzov, Ivan I. Lavrentiev, and Michael Zemp
The Cryosphere, 14, 585–598, https://doi.org/10.5194/tc-14-585-2020, https://doi.org/10.5194/tc-14-585-2020, 2020
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We present data of supra-glacial debris cover for 659 glaciers across the Greater Caucasus based on satellite images from the years 1986, 2000 and 2014. We combined semi-automated methods for mapping the clean ice with manual digitization of debris-covered glacier parts and calculated supra-glacial debris-covered area as the residual between these two maps. The distribution of the supra-glacial debris cover differs between northern and southern and between western, central and eastern Caucasus.
Lisbeth Langhammer, Melchior Grab, Andreas Bauder, and Hansruedi Maurer
The Cryosphere, 13, 2189–2202, https://doi.org/10.5194/tc-13-2189-2019, https://doi.org/10.5194/tc-13-2189-2019, 2019
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We have developed a novel procedure for glacier thickness estimations that combines traditional glaciological modeling constraints with ground-truth data, for example, those obtained with ground-penetrating radar (GPR) measurements. This procedure is very useful for determining ice volume when only limited data are available. Furthermore, we outline a strategy for acquiring GPR data on glaciers, such that the cost/benefit ratio is optimized.
Nico Mölg, Tobias Bolch, Andrea Walter, and Andreas Vieli
The Cryosphere, 13, 1889–1909, https://doi.org/10.5194/tc-13-1889-2019, https://doi.org/10.5194/tc-13-1889-2019, 2019
Short summary
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Debris can partly protect glaciers from melting. But many debris-covered glaciers change similar to debris-free glaciers. To better understand the debris influence we investigated 150 years of evolution of Zmutt Glacier in Switzerland. We found an increase in debris extent over time and a link to glacier flow velocity changes. We also found an influence of debris on the melt locally, but only a small volume change reduction over the whole glacier, also because of the influence of ice cliffs.
Harry Zekollari, Matthias Huss, and Daniel Farinotti
The Cryosphere, 13, 1125–1146, https://doi.org/10.5194/tc-13-1125-2019, https://doi.org/10.5194/tc-13-1125-2019, 2019
Short summary
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Glaciers in the European Alps play an important role in the hydrological cycle, act as a source for hydroelectricity and have a large touristic importance. We model the future evolution of all glaciers in the Alps with a novel model that combines both ice flow and melt processes. We find that under a limited warming scenario about one-third of the present-day ice volume will still be present by the end of the century, while under strong warming more than 90 % of the volume will be lost by 2100.
Tobias Zolles, Fabien Maussion, Stephan Peter Galos, Wolfgang Gurgiser, and Lindsey Nicholson
The Cryosphere, 13, 469–489, https://doi.org/10.5194/tc-13-469-2019, https://doi.org/10.5194/tc-13-469-2019, 2019
Short summary
Short summary
A mass and energy balance model was subjected to sensitivity and uncertainty analysis on two different Alpine glaciers. The global sensitivity analysis allowed for a mass balance measurement independent assessment of the model sensitivity and functioned as a reduction of the model free parameter space. A novel approach of a multi-objective optimization estimates the uncertainty of the simulated mass balance and the energy fluxes. The final model uncertainty is up to 1300 kg m−3 per year.
Matthew Olson and Summer Rupper
The Cryosphere, 13, 29–40, https://doi.org/10.5194/tc-13-29-2019, https://doi.org/10.5194/tc-13-29-2019, 2019
Short summary
Short summary
Solar radiation is the largest energy input for most alpine glaciers. However, many models oversimplify the influence of topographic shading. Also, no systematic studies have explored the variable impact of shading on glacier ice. We find that shading can significantly impact modeled solar radiation, particularly at low elevations, at high latitudes, and for glaciers with a north/south orientation. Excluding the effects of shading will overestimate modeled solar radiation for alpine glaciers.
Zhiyuan Cong, Shaopeng Gao, Wancang Zhao, Xin Wang, Guangming Wu, Yulan Zhang, Shichang Kang, Yongqin Liu, and Junfeng Ji
The Cryosphere, 12, 3177–3186, https://doi.org/10.5194/tc-12-3177-2018, https://doi.org/10.5194/tc-12-3177-2018, 2018
Short summary
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Cryoconites from glaciers on the Tibetan Plateau and surrounding area were studied for iron oxides. We found that goethite is the predominant iron oxide form. Using the abundance, speciation and optical properties of iron oxides, the total light absorption was quantitatively attributed to goethite, hematite, black carbon and organic matter. Such findings are essential to understand the relative significance of anthropogenic and natural impacts.
Denis Cohen, Fabien Gillet-Chaulet, Wilfried Haeberli, Horst Machguth, and Urs H. Fischer
The Cryosphere, 12, 2515–2544, https://doi.org/10.5194/tc-12-2515-2018, https://doi.org/10.5194/tc-12-2515-2018, 2018
Short summary
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As part of an integrative study about the safety of repositories for radioactive waste under ice age conditions in Switzerland, we modeled the flow of ice of the Rhine glacier at the Last Glacial Maximum to determine conditions at the ice–bed interface. Results indicate that portions of the ice lobes were at the melting temperature and ice was sliding, two conditions necessary for erosion by glacier. Conditions at the bed of the ice lobes were affected by climate and also by topography.
Cited articles
Abram, N. J., McGregor, H. V., Tierney, J. E., Evans, M. N., McKay, N. P.,
Kaufman, D. S., and Consortium, P. K.: Early onset of industrial-era warming
across the oceans and continents, Nature, 536, 411–418, 2016.
Barbante, C., Schwikowski, M., Döring, T., Gaggeler, H. W., Schotterer,
U., Tobler, L., Van De Velde, K., Ferrari, C., Cozzi, G., Turetta, A.,
Rosman, K., Bolshov, M., Capodaglio, G., Cescon, P., and Boutron, C.:
Historical record of European emissions of heavy metals to the atmosphere
since the 1650s from Alpine snow/ice cores drilled near Monte Rosa, Environ.
Sci. Technol., 38, 4085–4090, 2004.
Bauer, S. E., Bausch, A., Nazarenko, L., Tsigaridis, K., Xu, B. Q., Edwards,
R., Bisiaux, M., and McConnell, J.: Historical and future black carbon
deposition on the three ice caps: Ice core measurements and model
simulations from 1850 to 2100, J. Geophys. Res.-Atmos., 118, 7948–7961, 2013.
Bohleber, P., Wagenbach, D., Schöner, W., and Böhm, R.: To what
extent do water isotope records from low accumulation Alpine ice cores
reproduce instrumental temperature series?, Tellus B, 65, 17, 2013.
Bohleber, P., Erhardt, T., Spaulding, N., Hoffmann, H., Fischer, H., and
Mayewski, P.: Temperature and mineral dust variability recorded in two
low-accumulation Alpine ice cores over the last millennium, Clim. Past, 14,
21–37, https://doi.org/10.5194/cp-14-21-2018, 2018.
Böhm, R., Jones, P. D., Hiebl, J., Frank, D., Brunetti, M., and Maugeri,
M.: The early instrumental warm-bias: a solution for long central European
temperature series 1760–2007, Clim. Change, 101, 41–67, 2010.
Bond, T. C., Streets, D. G., Yarber, K. F., Nelson, S. M., Woo, J. H., and
Klimont, Z.: A technology-based global inventory of black and organic carbon
emissions from combustion, J. Geophys. Res.-Atmos., 109, D14203,
https://doi.org/10.1029/2003JD003697, 2004.
Bond, T. C. and Sun, H. L.: Can reducing black carbon emissions counteract
global warming?, Environ. Sci. Technol., 39, 5921–5926, 2005.
Bond, T. C., Bhardwaj, E., Dong, R., Jogani, R., Jung, S. K., Roden, C.,
Streets, D. G., and Trautmann, N. M.: Historical emissions of black and
organic carbon aerosol from energy-related combustion, 1850–2000, Global
Biogeochem. Cy., 21, GB2018, https://doi.org/10.1029/2006GB002840, 2007.
Bond, T. C., Doherty, S. J., Fahey, D. W., Forster, P. M., Berntsen, T.,
DeAngelo, B. J., Flanner, M. G., Ghan, S., Karcher, B., Koch, D., Kinne, S.,
Kondo, Y., Quinn, P. K., Sarofim, M. C., Schultz, M. G., Schulz, M.,
Venkataraman, C., Zhang, H., Zhang, S., Bellouin, N., Guttikunda, S. K.,
Hopke, P. K., Jacobson, M. Z., Kaiser, J. W., Klimont, Z., Lohmann, U.,
Schwarz, J. P., Shindell, D., Storelvmo, T., Warren, S. G., and Zender, C.
S.: Bounding the role of black carbon in the climate system: A scientific
assessment, J. Geophys. Res.-Atmos., 118, 5380–5552, 2013.
Brohan, P., Allan, R., Freeman, E., Wheeler, D., Wilkinson, C., and
Williamson, F.: Constraining the temperature history of the past millennium
using early instrumental observations, Clim. Past, 8, 1551–1563,
https://doi.org/10.5194/cp-8-1551-2012, 2012.
Büntgen, U., Tegel, W., Nicolussi, K., McCormick, M., Frank, D., Trouet,
V., Kaplan, J. O., Herzig, F., Heussner, K. U., Wanner, H., Luterbacher, J.,
and Esper, J.: 2500 Years of European Climate Variability and Human
Susceptibility, Science, 331, 578–582, 2011.
Cao, F., Zhang, Y. L., Szidat, S., Zapf, A., Wacker, L., and Schwikowski, M.:
Microgram-Level Radiocarbon Determination of Carbonaceous Particles in Firn
and Ice Samples: Pretreatment and Oc/Ec Separation, Radiocarbon, 55,
383–390, 2013.
Charlson, R. J., Schwartz, S. E., Hales, J. M., Cess, R. D., Coakley, J. A.,
Hansen, J. E., and Hofmann, D. J.: Climate Forcing by Anthropogenic Aerosols,
Science, 255, 423–430, 1992.
Chellman, N., McConnell, J. R., Arienzo, M., Pederson, G. T., Aarons, S. M.,
and Csank, A.: Reassessment of the Upper Fremont Glacier Ice-Core
Chronologies by Synchronizing of Ice-Core-Water Isotopes to a Nearby
Tree-Ring Chronology, Environ. Sci. Technol., 51, 4230–4238, 2017.
Currie, L. A., Benner, B. A., Kessler, J. D., Klinedinst, D. B., Klouda, G.
A., Marolf, J. V., Slater, J. F., Wise, S. A., Cachier, H., Cary, R., Chow,
J. C., Watson, J., Druffel, E. R. M., Masiello, C. A., Eglinton, T. I.,
Pearson, A., Reddy, C. M., Gustafsson, O., Quinn, J. G., Hartmann, P. C.,
Hedges, J. I., Prentice, K. M., Kirchstetter, T. W., Novakov, T., Puxbaum,
H., and Schmid, H.: A critical evaluation of interlaboratory data on total,
elemental, and isotopic carbon in the carbonaceous particle reference
material, NIST SRM 1649a, J. Res. Natl. Inst. Stan., 107, 279–298, 2002.
Döscher, A., Gäggeler, H. W., Schotterer, U., and Schwikowski, M.: A
130 years deposition record of sulfate, nitrate and chloride from a
high-alpine glacier, Water Air Soil Poll., 85, 603–609, 1995.
Döscher, A., Gäggeler, H. W., Schotterer, U., and Schwikowski, M.: A
historical record of ammonium concentrations from a glacier in the Alps,
Geophys. Res. Lett., 23, 2741–2744, 1996.
Dubovik, O., Holben, B., Eck, T. F., Smirnov, A., Kaufman, Y. J., King, M.
D., Tanre, D., and Slutsker, I.: Variability of absorption and optical
properties of key aerosol types observed in worldwide locations, J. Atmos.
Sci., 59, 590–608, 2002.
Engardt, M., Simpson, D., Schwikowski, M., and Granat, L.: Deposition of
sulphur and nitrogen in Europe 1900–2050, Model calculations and comparison
to historical observations, Tellus B, 69, 1328945,
https://doi.org/10.1080/16000889.2017.1328945, 2017.
Eyring, V., Bony, S., Meehl, G. A., Senior, C. A., Stevens, B., Stouffer, R.
J., and Taylor, K. E.: Overview of the Coupled Model Intercomparison Project
Phase 6 (CMIP6) experimental design and organization, Geosci. Model Dev., 9,
1937–1958, https://doi.org/10.5194/gmd-9-1937-2016, 2016.
Fagerli, H., Legrand, M., Preunkert, S., Vestreng, V., Simpson, D., and
Cerqueira, M.: Modeling historical long-term trends of sulfate, ammonium, and
elemental carbon over Europe: A comparison with ice core records in the Alps,
J. Geophys. Res.-Atmos., 112, D23S13, https://doi.org/10.1029/2006JD008044, 2007.
Fischer, H., Schüpbach, S., Gfeller, G., Bigler, M., Rothlisberger, R.,
Erhardt, T., Stocker, T. F., Mulvaney, R., and Wolff, E.: Millennial changes
in North American wildfire and soil activity over the last glacial cycle,
Nat. Geosci., 8, 723–727, 2015.
Flanner, M. G.: Arctic climate sensitivity to local black carbon, J. Geophys.
Res.-Atmos., 118, 1840–1851, 2013.
Flanner, M. G. and Zender, C. S.: Snowpack radiative heating: Influence on
Tibetan Plateau climate, Geophys. Res. Lett., 32, L06501,
https://doi.org/10.1029/2004GL022076, 2005.
Flanner, M. G., Zender, C. S., Randerson, J. T., and Rasch, P. J.:
Present-day climate forcing and response from black carbon in snow, J.
Geophys. Res.-Atmos., 112, D11202, https://doi.org/10.1029/2006JD008003, 2007.
Flanner, M. G., Zender, C. S., Hess, P. G., Mahowald, N. M., Painter, T. H.,
Ramanathan, V., and Rasch, P. J.: Springtime warming and reduced snow cover
from carbonaceous particles, Atmos. Chem. Phys., 9, 2481–2497,
https://doi.org/10.5194/acp-9-2481-2009, 2009.
Frank, D., Büntgen, U., Böhm, R., Maugeri, M., and Esper, J.: Warmer
early instrumental measurements versus colder reconstructed temperatures:
shooting at a moving target, Quaternary Sci. Rev., 26, 3298–3310, 2007.
Gabbi, J., Huss, M., Bauder, A., Cao, F., and Schwikowski, M.: The impact of
Saharan dust and black carbon on albedo and long-term mass balance of an
Alpine glacier, The Cryosphere, 9, 1385–1400,
https://doi.org/10.5194/tc-9-1385-2015, 2015.
Gabrieli, J. and Barbante, C.: The Alps in the age of the Anthropocene: the
impact of human activities on the cryosphere recorded in the Colle Gnifetti
glacier, Rend Lincei-Sci. Fis., 25, 71–83, 2014.
Gabrieli, J., Vallelonga, P., Cozzi, G., Gabrielli, P., Gambaro, A., Sigl,
M., Decet, F., Schwikowski, M., Gaggeler, H., Boutron, C., Cescon, P., and
Barbante, C.: Post 17th-Century Changes of European PAH Emissions Recorded in
High-Altitude Alpine Snow and Ice, Environ. Sci. Technol., 44, 3260–3266,
2010.
Gabrieli, J., Cozzi, G., Vallelonga, P., Schwikowski, M., Sigl, M.,
Eickenberg, J., Wacker, L., Boutron, C., Gaggeler, H., Cescon, P., and
Barbante, C.: Contamination of Alpine snow and ice at Colle Gnifetti,
Swiss/Italian Alps, from nuclear weapons tests, Atmos. Environ., 45,
587–593, 2011.
Gentner, D. R., Isaacman, G., Worton, D. R., Chan, A. W. H., Dallmann, T. R.,
Davis, L., Liu, S., Day, D. A., Russell, L. M., Wilson, K. R., Weber, R.,
Guha, A., Harley, R. A., and Goldstein, A. H.: Elucidating secondary organic
aerosol from diesel and gasoline vehicles through detailed characterization
of organic carbon emissions, P. Natl. Acad. Sci. USA, 109, 18318–18323,
2012.
Gentner, D. R., Jathar, S. H., Gordon, T. D., Bahreini, R., Day, D. A., El
Haddad, I., Hayes, P. L., Pieber, S. M., Platt, S. M., de Gouw, J.,
Goldstein, A. H., Harley, R. A., Jimenez, J. L., Prevot, A. S. H., and
Robinson, A. L.: Review of Urban Secondary Organic Aerosol Formation from
Gasoline and Diesel Motor Vehicle Emissions, Environ. Sci. Technol., 51,
1074–1093, 2017.
Goosse, H., Barriat, P.-Y., Dalaiden, Q., Klein, F., Marzeion, B., Maussion,
F., Pelucchi, P., and Vlug, A.: Testing the consistency between changes in
simulated climate and Alpine glacier length over the past millennium, Clim.
Past, 14, 1119–1133, https://doi.org/10.5194/cp-14-1119-2018, 2018.
Häberli, W., Schotterer, U., Wagenbach, D., Häberlischwitter, H., and
Bortenschlager, S.: Accumulation Characteristics on a Cold, High-Alpine Firn
Saddle from a Snow-Pit Study on Colle-Gnifetti, Monte-Rosa, Swiss Alps, J.
Glaciol., 29, 260–271, 1983.
Hansen, J. and Nazarenko, L.: Soot climate forcing via snow and ice albedos,
P. Natl. Acad. Sci. USA, 101, 423–428, 2004.
Hansen, J., Sato, M., Ruedy, R., Kharecha, P., Lacis, A., Miller, R.,
Nazarenko, L., Lo, K., Schmidt, G. A., Russell, G., Aleinov, I., Bauer, S.,
Baum, E., Cairns, B., Canuto, V., Chandler, M., Cheng, Y., Cohen, A., Del
Genio, A., Faluvegi, G., Fleming, E., Friend, A., Hall, T., Jackman, C.,
Jonas, J., Kelley, M., Kiang, N. Y., Koch, D., Labow, G., Lerner, J., Menon,
S., Novakov, T., Oinas, V., Perlwitz, J., Perlwitz, J., Rind, D., Romanou,
A., Schmunk, R., Shindell, D., Stone, P., Sun, S., Streets, D., Tausnev, N.,
Thres-her, D., Unger, N., Yao, M., and Zhang, S.: Climate simulations for
1880–2003 with GISS modelE, Clim. Dynam., 29, 661–696, 2007.
Hawkins, E. and Sutton, R.: Time of emergence of climate signals, Geophys.
Res. Lett., 39, L01702, https://doi.org/10.1029/2011GL050087, 2012.
Haywood, J. and Boucher, O.: Estimates of the direct and indirect radiative
forcing due to tropospheric aerosols: A review, Rev. Geophys., 38, 513–543,
2000.
Hirdman, D., Burkhart, J. F., Sodemann, H., Eckhardt, S., Jefferson, A.,
Quinn, P. K., Sharma, S., Ström, J., and Stohl, A.: Long-term trends of
black carbon and sulphate aerosol in the Arctic: changes in atmospheric
transport and source region emissions, Atmos. Chem. Phys., 10, 9351–9368,
https://doi.org/10.5194/acp-10-9351-2010, 2010.
Huss, M., Hock, R., Bauder, A., and Funk, M.: 100-year mass changes in the
Swiss Alps linked to the Atlantic Multidecadal Oscillation, Geophys. Res.
Lett., 37, L10501, https://doi.org/10.1029/2010GL042616, 2010.
Imhof, P., Nesje, A., and Nussbaumer, S. U.: Climate and glacier fluctuations
at Jostedalsbreen and Folgefonna, southwestern Norway and in the western Alps
from the “Little Ice Age” until the present: The influence of the North
Atlantic Oscillation, Holocene, 22, 235–247, 2012.
Jenk, T. M., Szidat, S., Schwikowski, M., Gäggeler, H. W., Brütsch,
S., Wacker, L., Synal, H.-A., and Saurer, M.: Radiocarbon analysis in an
Alpine ice core: record of anthropogenic and biogenic contributions to
carbonaceous aerosols in the past (1650–1940), Atmos. Chem. Phys., 6,
5381–5390, https://doi.org/10.5194/acp-6-5381-2006, 2006.
Jenk, T. M., Szidat, S., Bolius, D., Sigl, M., Gaggeler, H. W., Wacker, L.,
Ruff, M., Barbante, C., Boutron, C. F., and Schwikowski, M.: A novel
radiocarbon dating technique applied to an ice core from the Alps indicating
late Pleistocene ages, J. Geophys. Res.-Atmos., 114, D14305,
https://doi.org/10.1029/2009JD011860, 2009.
Jungclaus, J. H., Bard, E., Baroni, M., Braconnot, P., Cao, J., Chini, L. P.,
Egorova, T., Evans, M., González-Rouco, J. F., Goosse, H., Hurtt, G. C.,
Joos, F., Kaplan, J. O., Khodri, M., Klein Goldewijk, K., Krivova, N.,
LeGrande, A. N., Lorenz, S. J., Luterbacher, J., Man, W., Maycock, A. C.,
Meinshausen, M., Moberg, A., Muscheler, R., Nehrbass-Ahles, C.,
Otto-Bliesner, B. I., Phipps, S. J., Pongratz, J., Rozanov, E., Schmidt, G.
A., Schmidt, H., Schmutz, W., Schurer, A., Shapiro, A. I., Sigl, M., Smerdon,
J. E., Solanki, S. K., Timmreck, C., Toohey, M., Usoskin, I. G., Wagner, S.,
Wu, C.-J., Yeo, K. L., Zanchettin, D., Zhang, Q., and Zorita, E.: The PMIP4
contribution to CMIP6 – Part 3: The last millennium, scientific objective,
and experimental design for the PMIP4 past1000 simulations, Geosci. Model
Dev., 10, 4005–4033, https://doi.org/10.5194/gmd-10-4005-2017, 2017.
Junker, C. and Liousse, C.: A global emission inventory of carbonaceous
aerosol from historic records of fossil fuel and biofuel consumption for the
period 1860–1997, Atmos. Chem. Phys., 8, 1195–1207,
https://doi.org/10.5194/acp-8-1195-2008, 2008.
Kaspari, S. D., Schwikowski, M., Gysel, M., Flanner, M. G., Kang, S., Hou,
S., and Mayewski, P. A.: Recent increase in black carbon concentrations from
a Mt. Everest ice core spanning 1860–2000 AD, Geophys. Res. Lett., 38,
L04703, https://doi.org/10.1029/2010GL046096, 2011.
Keegan, K. M., Albert, M. R., McConnell, J. R., and Baker, I.: Climate change
and forest fires synergistically drive widespread melt events of the
Greenland Ice Sheet, P. Natl. Acad. Sci. USA, 111, 7964–7967, 2014.
Kirchgeorg, T., Dreyer, A., Gabrieli, J., Kehrwald, N., Sigl, M.,
Schwikowski, M., Boutron, C., Gambaro, A., Barbante, C., and Ebinghaus, R.:
Temporal variations of perfluoroalkyl substances and polybrominated diphenyl
ethers in alpine snow, Environ. Pollut., 178, 367–374, 2013.
Koch, D., Bauer, S. E., Del Genio, A., Faluvegi, G., McConnell, J. R., Menon,
S., Miller, R. L., Rind, D., Ruedy, R., Schmidt, G. A., and Shindell, D.:
Coupled Aerosol-Chemistry-Climate Twentieth-Century Transient Model
Investigation: Trends in Short-Lived Species and Climate Responses, J.
Climate, 24, 2693–2714, 2011.
Konrad, H., Bohleber, P., Wagenbach, D., Vincent, C., and Eisen, O.:
Determining the age distribution of Colle Gnifetti, Monte Rosa, Swiss Alps,
by combining ice cores, ground-penetrating radar and a simple flow model, J.
Glaciol., 59, 179–189, 2013.
Lack, D. A., Moosmuller, H., McMeeking, G. R., Chakrabarty, R. K., and
Baumgardner, D.: Characterizing elemental, equivalent black, and refractory
black carbon aerosol particles: a review of techniques, their limitations and
uncertainties, Anal. Bioanal. Chem., 406, 99–122, 2014.
Lamarque, J.-F., Bond, T. C., Eyring, V., Granier, C., Heil, A., Klimont, Z.,
Lee, D., Liousse, C., Mieville, A., Owen, B., Schultz, M. G., Shindell, D.,
Smith, S. J., Stehfest, E., Van Aardenne, J., Cooper, O. R., Kainuma, M.,
Mahowald, N., McConnell, J. R., Naik, V., Riahi, K., and van Vuuren, D. P.:
Historical (1850–2000) gridded anthropogenic and biomass burning emissions
of reactive gases and aerosols: methodology and application, Atmos. Chem.
Phys., 10, 7017–7039, https://doi.org/10.5194/acp-10-7017-2010, 2010.
Lamarque, J.-F., Dentener, F., McConnell, J., Ro, C.-U., Shaw, M., Vet, R.,
Bergmann, D., Cameron-Smith, P., Dalsoren, S., Doherty, R., Faluvegi, G.,
Ghan, S. J., Josse, B., Lee, Y. H., MacKenzie, I. A., Plummer, D., Shindell,
D. T., Skeie, R. B., Stevenson, D. S., Strode, S., Zeng, G., Curran, M.,
Dahl-Jensen, D., Das, S., Fritzsche, D., and Nolan, M.: Multi-model mean
nitrogen and sulfur deposition from the Atmospheric Chemistry and Climate
Model Intercomparison Project (ACCMIP): evaluation of historical and
projected future changes, Atmos. Chem. Phys., 13, 7997–8018,
https://doi.org/10.5194/acp-13-7997-2013, 2013.
Larsen, D. J., Miller, G. H., and Geirsdottir, A.: Asynchronous Little Ice
Age glacier fluctuations in Iceland and European Alps linked to shifts in
subpolar North Atlantic circulation, Earth Planet Sc. Lett., 380, 52–59,
2013.
Lau, W. K. M., Kim, M. K., Kim, K. M., and Lee, W. S.: Enhanced surface
warming and accelerated snow melt in the Himalayas and Tibetan Plateau
induced by absorbing aerosols, Environ. Res. Lett., 5, 025204,
https://doi.org/10.1088/1748-9326/5/2/025204, 2010.
Lavanchy, V. M. H., Gaggeler, H. W., Schotterer, U., Schwikowski, M., and
Baltensperger, U.: Historical record of carbonaceous particle concentrations
from a European high-alpine glacier (Colle Gnifetti, Switzerland), J.
Geophys. Res.-Atmos., 104, 21227–21236, 1999.
Le Roy, M., Nicolussi, K., Deline, P., Astrade, L., Edouard, J. L., Miramont,
C., and Arnaud, F.: Calendar-dated glacier variations in the western European
Alps during the Neoglacial: the Mer de Glace record, Mont Blanc massif,
Quaternary Sci. Rev., 108, 1–22, 2015.
Lee, W. S., Bhawar, R. L., Kim, M. K., and Sang, J.: Study of aerosol effect
on accelerated snow melting over the Tibetan Plateau during boreal spring,
Atmos. Environ., 75, 113–122, 2013.
Lee, Y. H., Lamarque, J.-F., Flanner, M. G., Jiao, C., Shindell, D. T.,
Berntsen, T., Bisiaux, M. M., Cao, J., Collins, W. J., Curran, M., Edwards,
R., Faluvegi, G., Ghan, S., Horowitz, L. W., McConnell, J. R., Ming, J.,
Myhre, G., Nagashima, T., Naik, V., Rumbold, S. T., Skeie, R. B., Sudo, K.,
Takemura, T., Thevenon, F., Xu, B., and Yoon, J.-H.: Evaluation of
preindustrial to present-day black carbon and its albedo forcing from
Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP),
Atmos. Chem. Phys., 13, 2607–2634, https://doi.org/10.5194/acp-13-2607-2013,
2013.
Lim, S., Faïn, X., Zanatta, M., Cozic, J., Jaffrezo, J.-L., Ginot, P.,
and Laj, P.: Refractory black carbon mass concentrations in snow and ice:
method evaluation and inter-comparison with elemental carbon measurement,
Atmos. Meas. Tech., 7, 3307–3324, https://doi.org/10.5194/amt-7-3307-2014,
2014.
Linke, C., Möhler, O., Veres, A., Mohácsi, Á., Bozóki, Z.,
Szabó, G., and Schnaiter, M.: Optical properties and mineralogical
composition of different Saharan mineral dust samples: a laboratory study,
Atmos. Chem. Phys., 6, 3315–3323, https://doi.org/10.5194/acp-6-3315-2006,
2006.
Liu, J. F., Fan, S. M., Horowitz, L. W., and Levy, H.: Evaluation of factors
controlling long-range transport of black carbon to the Arctic, J. Geophys.
Res.-Atmos., 116, D04307, https://doi.org/10.1029/2010JD015145, 2011.
Lohmann, U. and Feichter, J.: Global indirect aerosol effects: a review,
Atmos. Chem. Phys., 5, 715–737, https://doi.org/10.5194/acp-5-715-2005,
2005.
Luo, B.: Stratospheric aerosol data for use in CMIP6 models, available at:
ftp://iacftp.ethz.ch/pub_read/luo/CMIP6/, last access: 21 November
2016.
Lugauer, M., Baltensperger, U., Furger, M., Gaggeler, H. W., Jost, D. T.,
Schwikowski, M., and Wanner, H.: Aerosol transport to the high Alpine sites
Jungfraujoch (3454 m asl) and Colle Gnifetti (4452 m asl), Tellus B, 50,
76–92, 1998.
Luterbacher, J., Werner, J. P., Smerdon, J. E., Fernandez-Donado, L.,
Gonzalez-Rouco, F. J., Barriopedro, D., Ljungqvist, F. C., Büntgen, U.,
Zorita, E., Wagner, S., Esper, J., McCarroll, D., Toreti, A., Frank, D.,
Jungclaus, J. H., Barriendos, M., Bertolin, C., Bothe, O., Brazdil, R.,
Camuffo, D., Dobrovolny, P., Gagen, M., Garica-Bustamante, E., Ge, Q.,
Gomez-Navarro, J. J., Guiot, J., Hao, Z., Hegerl, G. C., Holmgren, K.,
Klimenko, V. V., Martin-Chivelet, J., Pfister, C., Roberts, N., Schindler,
A., Schurer, A., Solomina, O., von Gunten, L., Wahl, E., Wanner, H., Wetter,
O., Xoplaki, E., Yuan, N., Zanchettin, D., Zhang, H., and Zerefos, C.:
European summer temperatures since Roman times, Environ. Res. Lett., 11,
024001, https://doi.org/10.1088/1748-9326/11/2/024001, 2016.
Lüthi, M. P.: Little Ice Age climate reconstruction from ensemble
reanalysis of Alpine glacier fluctuations, The Cryosphere, 8, 639–650,
https://doi.org/10.5194/tc-8-639-2014, 2014.
McConnell, J. R. and Edwards, R.: Coal burning leaves toxic heavy metal
legacy in the Arctic, P. Natl. Acad. Sci. USA, 105, 12140–12144, 2008.
McConnell, J. R., Edwards, R., Kok, G. L., Flanner, M. G., Zender, C. S.,
Saltzman, E. S., Banta, J. R., Pasteris, D. R., Carter, M. M., and Kahl, J.
D. W.: 20th-century industrial black carbon emissions altered arctic climate
forcing, Science, 317, 1381–1384, 2007.
McConnell, J. R., Wilson, A. I., Stohl, A., Arienzo, M. M., Chellman, N. J.,
Eckhardt, S., Thompson, E. M., Pollard, A. M., and Steffensen, J. P.: Lead
pollution recorded in Greenland ice indicates European emissions tracked
plagues, wars, and imperial expansion during antiquity, P. Natl. Acad. Sci.
USA, 115, 5726–5731, https://doi.org/10.1073/pnas.1721818115, 2018.
Mernild, S. H., Lipscomb, W. H., Bahr, D. B., Radic, V., and Zemp, M.: Global
glacier changes: a revised assessment of committed mass losses and sampling
uncertainties, The Cryosphere, 7, 1565–1577,
https://doi.org/10.5194/tc-7-1565-2013, 2013.
Mernild, S. H., Hanna, E., McConnell, J. R., Sigl, M., Beckerman, A. P., Yde,
J. C., Cappelen, J., Malmros, J. K., and Steffen, K.: Greenland precipitation
trends in a long-term instrumental climate context (1890–2012): evaluation
of coastal and ice core records, Int. J. Climatol., 35, 303–320, 2015.
Moulin, C. and Chiapello, I.: Impact of human-induced desertification on the
intensification of Sahel dust emission and export over the last decades,
Geophys. Res. Lett., 33, L18808, https://doi.org/10.1029/2006GL025923, 2006.
Nussbaumer, S. U. and Zumbühl, H. J.: The Little Ice Age history of the
Glacier des Bossons (Mont Blanc massif, France): a new high-resolution
glacier length curve based on historical documents, Clim. Change, 111,
301–334, 2012.
Nyeki, S., Kalberer, M., Colbeck, I., De Wekker, S., Furger, M., Gaggeler, H.
W., Kossmann, M., Lugauer, M., Steyn, D., Weingartner, E., Wirth, M., and
Baltensperger, U.: Convective boundary layer evolution to 4 km asl over
high-alpine terrain: Airborne lidar observations in the Alps, Geophys. Res.
Lett., 27, 689–692, 2000.
Oerlemans, J.: Extracting a climate signal from 169 glacier records, Science,
308, 675–677, 2005.
Oeschger, H.: First results from Alpine core drilling projects, Z.
Gletscherkunde Glazialgeologie, 13, 193–208, 1977.
Painter, T. H., Flanner, M. G., Kaser, G., Marzeion, B., VanCuren, R. A., and
Abdalati, W.: End of the Little Ice Age in the Alps forced by industrial
black carbon, P. Natl. Acad. Sci. USA, 110, 15216–15221, 2013.
Penner, J. E., Chuang, C. C., and Grant, K.: Climate forcing by carbonaceous
and sulfate aerosols, Clim. Dynam., 14, 839–851, 1998.
Petzold, A., Ogren, J. A., Fiebig, M., Laj, P., Li, S.-M., Baltensperger, U.,
Holzer-Popp, T., Kinne, S., Pappalardo, G., Sugimoto, N., Wehrli, C.,
Wiedensohler, A., and Zhang, X.-Y.: Recommendations for reporting “black
carbon” measurements, Atmos. Chem. Phys., 13, 8365–8379,
https://doi.org/10.5194/acp-13-8365-2013, 2013.
Platt, S. M., El Haddad, I., Pieber, S. M., Zardini, A. A., Suarez-Bertoa,
R., Clairotte, M., Daellenbach, K. R., Huang, R. J., Slowik, J. G.,
Hellebust, S., Temime-Roussel, B., Marchand, N., de Gouw, J., Jimenez, J. L.,
Hayes, P. L., Robinson, A. L., Baltensperger, U., Astorga, C., and Prevot, A.
S. H.: Gasoline cars produce more carbonaceous particulate matter than modern
filter-equipped diesel cars, Sci. Rep.-UK, 7, 4926,
https://doi.org/10.1038/s41598-017-03714-9, 2017.
Polashenski, C. M., Dibb, J. E., Flanner, M. G., Chen, J. Y., Courville, Z.
R., Lai, A. M., Schauer, J. J., Shafer, M. M., and Bergin, M.: Neither dust
nor black carbon causing apparent albedo decline in Greenland's dry snow
zone: Implications for MODIS C5 surface reflectance, Geophys. Res. Lett., 42,
9319–9327, 2015.
Quinn, P. K., Bates, T. S., Baum, E., Doubleday, N., Fiore, A. M., Flanner,
M., Fridlind, A., Garrett, T. J., Koch, D., Menon, S., Shindell, D., Stohl,
A., and Warren, S. G.: Short-lived pollutants in the Arctic: their climate
impact and possible mitigation strategies, Atmos. Chem. Phys., 8, 1723–1735,
https://doi.org/10.5194/acp-8-1723-2008, 2008.
Raible, C. C., Bronnimann, S., Auchmann, R., Brohan, P., Frolicher, T. L.,
Graf, H. F., Jones, P., Luterbacher, J., Muthers, S., Neukom, R., Robock, A.,
Self, S., Sudrajat, A., Timmreck, C., and Wegmann, M.: Tambora 1815 as a test
case for high impact volcanic eruptions: Earth system effects, WIRES Clim.
Change, 7, 569–589, 2016.
Revell, L. E., Stenke, A., Luo, B., Kremser, S., Rozanov, E., Sukhodolov, T.,
and Peter, T.: Impacts of Mt Pinatubo volcanic aerosol on the tropical
stratosphere in chemistry–climate model simulations using CCMI and CMIP6
stratospheric aerosol data, Atmos. Chem. Phys., 17, 13139–13150,
https://doi.org/10.5194/acp-17-13139-2017, 2017.
Ruggieri, E.: A Bayesian approach to detecting change points in climatic
records, Int. J. Climatol., 33, 520-5-28, 2013.
Schwarz, J. P., Gao, R. S., Fahey, D. W., Thomson, D. S., Watts, L. A.,
Wilson, J. C., Reeves, J. M., Darbeheshti, M., Baumgardner, D. G., Kok, G.
L., Chung, S. H., Schulz, M., Hendricks, J., Lauer, A., Karcher, B., Slowik,
J. G., Rosenlof, K. H., Thompson, T. L., Langford, A. O., Loewenstein, M.,
and Aikin, K. C.: Single-particle measurements of midlatitude black carbon
and light-scattering aerosols from the boundary layer to the lower
stratosphere, J. Geophys. Res.-Atmos., 111, D16207, https://doi.org/10.1029/2006JD007076,
2006.
Schwikowski, M., Döscher, A., Gäggeler, H. W., and Schotterer, U.:
Anthropogenic versus natural sources of atmospheric sulphate from an Alpine
ice core, Tellus B, 51, 938–951, 1999a.
Schwikowski, M., Brütsch, S., Gäggeler, H. W., and U. Schotterer,
U.:, A high-resolution air chemistry record from an Alpine ice core:
Fiescherhorn glacier, Swiss Alps, J. Geophys. Res., 104, 13709–13719, 1999b.
Schwikowski, M., Barbante, C., Doering, T., Gaeggeler, H. W., Boutron, C.,
Schotterer, U., Tobler, L., Van De Velde, K. V., Ferrari, C., Cozzi, G.,
Rosman, K., and Cescon, P.: Post-17th-century changes of European lead
emissions recorded in high-altitude alpine snow and ice, Environ. Sci.
Technol., 38, 957–964, 2004.
Shindell, D. T., Lamarque, J.-F., Schulz, M., Flanner, M., Jiao, C., Chin,
M., Young, P. J., Lee, Y. H., Rotstayn, L., Mahowald, N., Milly, G.,
Faluvegi, G., Balkanski, Y., Collins, W. J., Conley, A. J., Dalsoren, S.,
Easter, R., Ghan, S., Horowitz, L., Liu, X., Myhre, G., Nagashima, T., Naik,
V., Rumbold, S. T., Skeie, R., Sudo, K., Szopa, S., Takemura, T.,
Voulgarakis, A., Yoon, J.-H., and Lo, F.: Radiative forcing in the ACCMIP
historical and future climate simulations, Atmos. Chem. Phys., 13,
2939–2974, https://doi.org/10.5194/acp-13-2939-2013, 2013.
Sigl, M., Jenk, T. M., Kellerhals, T., Szidat, S., Gäggeler, H. W.,
Wacker, L., Synal, H. A., Boutron, C., Barbante, C., Gabrieli, J., and
Schwikowski, M.: Towards radiocarbon dating of ice cores, J. Glaciol., 55,
985–996, 2009.
Sigl, M., McConnell, J. R., Layman, L., Maselli, O., McGwire, K., Pasteris,
D., Dahl-Jensen, D., Steffensen, J. P., Vinther, B., Edwards, R., Mulvaney,
R., and Kipfstuhl, S.: A new bipolar ice core record of volcanism from WAIS
Divide and NEEM and implications for climate forcing of the last 2000 years,
J. Geophys. Res.-Atmos., 118, 1151–1169, 2013.
Sigl, M., Winstrup, M., McConnell, J. R., Welten, K. C., Plunkett, G.,
Ludlow, F., Buntgen, U., Caffee, M., Chellman, N., Dahl-Jensen, D., Fischer,
H., Kipfstuhl, S., Kostick, C., Maselli, O. J., Mekhaldi, F., Mulvaney, R.,
Muscheler, R., Pasteris, D. R., Pilcher, J. R., Salzer, M., Schüpbach,
S., Steffensen, J. P., Vinther, B. M., and Woodruff, T. E.: Timing and
climate forcing of volcanic eruptions for the past 2500 years, Nature, 523,
543–549, 2015.
Sigl, M., Abram, N. J., Gabrieli, J., Jenk, T. M., Osmont, D., and Schwikowski, M.:
Record of black carbon (rBC), bismuth, lead and others from 1741 to 2015 AD from Colle Gnifetti ice cores GC15 and GC03B (Swiss/Italian
Alps),
PANGAEA, https://doi.org/10.1594/PANGAEA.894787,
2018.
Solomina, O. N., Bradley, R. S., Jomelli, V., Geirsdottir, A., Kaufman, D.
S., Koch, J., Mckay, N. P., Masiokas, M., Miller, G., Nesje, A., Nicolussi,
K., Owen, L. A., Putnam, A. E., Wanner, H., Wiles, G., and Yang, B.: Glacier
fluctuations during the past 2000 years, Quaternary Sci. Rev., 149, 61–90,
2016.
Steiner, D., Pauling, A., Nussbaumer, S. U., Nesje, A., Luterbacher, J.,
Wanner, H., and Zumbuhl, H. J.: Sensitivity of European glaciers to
precipitation and temperature – two case studies, Clim. Change, 90,
413–441, 2008.
Stohl, A.: Characteristics of atmospheric transport into the Arctic
troposphere, J. Geophys. Res.-Atmos., 111, D11306, https://doi.org/10.1029/2005JD006888,
2006.
Sun, J., Zhi, G., Hitzenberger, R., Chen, Y., Tian, C., Zhang, Y., Feng, Y.,
Cheng, M., Zhang, Y., Cai, J., Chen, F., Qiu, Y., Jiang, Z., Li, J., Zhang,
G., and Mo, Y.: Emission factors and light absorption properties of brown
carbon from household coal combustion in China, Atmos. Chem. Phys., 17,
4769–4780, https://doi.org/10.5194/acp-17-4769-2017, 2017.
Swingedouw, D., Mignot, J., Ortega, P., Khodri, M., Menegoz, M., Cassou, C.,
and Hanquiez, V.: Impact of explosive volcanic eruptions on the main climate
variability modes, Global Planet. Change, 150, 24–45, 2017.
Thevenon, F., Anselmetti, F. S., Bernasconi, S. M., and Schwikowski, M.:
Mineral dust and elemental black carbon records from an Alpine ice core
(Colle Gnifetti glacier) over the last millennium, J. Geophys. Res.-Atmos.,
114, D17102, https://doi.org/10.1029/2008JD011490, 2009.
Toohey, M. and Sigl, M.: Volcanic stratospheric sulfur injections and aerosol
optical depth from 500 BCE to 1900 CE, Earth Syst. Sci. Data, 9, 809–831,
https://doi.org/10.5194/essd-9-809-2017, 2017.
Uglietti, C., Zapf, A., Jenk, T. M., Sigl, M., Szidat, S., Salazar, G., and
Schwikowski, M.: Radiocarbon dating of glacier ice: overview, optimisation,
validation and potential, The Cryosphere, 10, 3091–3105,
https://doi.org/10.5194/tc-10-3091-2016, 2016.
Usoskin, I. G.: A history of solar activity over millenia, Living Rev Sol.
Phys., 14, 3, https://doi.org/10.1007/s41116-017-0006-9, 2013.
Vincent, C., Le Meur, E., Six, D., and Funk, M.: Solving the paradox of the
end of the Little Ice Age in the Alps, Geophys. Res. Lett., 32, L09706,
https://doi.org/10.1029/2005GL022552, 2005.
Wagenbach, D. and Geis, K.: The Mineral Dust Record in a High-Altitude Alpine
Glacier (Colle-Gnifetti, Swiss Alps), Nato Adv. Sci. I C-Mat., 282, 543–564,
1989.
Wagenbach, D., Preunkert, S., Schafer, J., Jung, W., and Tomadin, L.:
Northward transport of Saharan dust recorded in a deep Alpine ice core,
Envir. Sci. Tech Lib, 11, 291–300, 1996.
Wagenbach, D., Bohleber, P., and Preunkert, S.: Cold, Alpine Ice Bodies
Revisited: What May We Learn from Their Impurity and Isotope Content?, Geogr.
Ann. A, 94, 245–263, 2012.
Wegmann, M., Bronnimann, S., Bhend, J., Franke, J., Folini, D., Wild, M., and
Luterbacher, J.: Volcanic Influence on European Summer Precipitation through
Monsoons: Possible Cause for “Years without Summer”, J. Climate, 27,
3683–3691, 2014.
Wendl, I. A., Menking, J. A., Färber, R., Gysel, M., Kaspari, S. D.,
Laborde, M. J. G., and Schwikowski, M.: Optimized method for black carbon
analysis in ice and snow using the Single Particle Soot Photometer, Atmos.
Meas. Tech., 7, 2667–2681, https://doi.org/10.5194/amt-7-2667-2014, 2014.
Zekollari, H., Furst, J. J., and Huybrechts, P.: Modelling the evolution of
Vadret da Morteratsch, Switzerland, since the Little Ice Age and into the
future, J. Glaciol., 60, 1155–1168, 2014.
Zemp, M., Haeberli, W., Hoelzle, M., and Paul, F.: Alpine glaciers to
disappear within decades?, Geophys. Res. Lett., 33, L13504,
https://doi.org/10.1029/2006GL026319, 2006.
Zumbühl, H. J., Steiner, D., and Nussbaumer, S. U.: 19th century glacier
representations and fluctuations in the central and western European Alps: An
interdisciplinary approach, Global Planet. Change, 60, 42–57, 2008.
Short summary
The fast retreat of Alpine glaciers since the mid-19th century documented in photographs is used as a symbol for the human impact on global climate, yet the key driving forces remain elusive. Here we argue that not industrial soot but volcanic eruptions were responsible for an apparently accelerated deglaciation starting in the 1850s. Our findings support a negligible role of human activity in forcing glacier recession at the end of the Little Ice Age, highlighting the role of natural drivers.
The fast retreat of Alpine glaciers since the mid-19th century documented in photographs is used...
