Articles | Volume 18, issue 4
https://doi.org/10.5194/tc-18-1633-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/tc-18-1633-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
09 Apr 2024
Research article |
| 09 Apr 2024
| 09 Apr 2024
Fifty years of firn evolution on Grigoriev ice cap, Tien Shan, Kyrgyzstan
Department of Geosciences, University of Fribourg, Fribourg, Switzerland
Anja Eichler
Laboratory of Environmental Chemistry, Paul Scherrer Institute, Villigen PSI, Switzerland
Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland
Margit Schwikowski
Laboratory of Environmental Chemistry, Paul Scherrer Institute, Villigen PSI, Switzerland
Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland
Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Bern, Switzerland
Sabina Brütsch
Laboratory of Environmental Chemistry, Paul Scherrer Institute, Villigen PSI, Switzerland
Enrico Mattea
Department of Geosciences, University of Fribourg, Fribourg, Switzerland
Stanislav Kutuzov
Byrd Polar and Climate Research Center, The Ohio State University, Columbus OH, USA
School of Earth Sciences, The Ohio State University, Columbus OH, USA
Martin Heule
Radioanalytics, Paul Scherrer Institute, Villigen PSI, Switzerland
Ryskul Usubaliev
Central Asian Institute of Applied Geosciences (CAIAG), Bishkek, Kyrgyzstan
Sultan Belekov
KyrgyzHydromet, Bishkek, Kyrgyzstan
Vladimir N. Mikhalenko
Moscow, Russia (see the acknowledgements for details)
Martin Hoelzle
Department of Geosciences, University of Fribourg, Fribourg, Switzerland
Marlene Kronenberg
Department of Geosciences, University of Fribourg, Fribourg, Switzerland
now at: Axpo Holding AG, Baden, Switzerland
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Dominik Amschwand, Martin Scherler, Martin Hoelzle, Bernhard Krummenacher, Anna Haberkorn, Christian Kienholz, and Hansueli Gubler
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Preprint withdrawn
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Short summary
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Short summary
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Meltwater runoff is one of the main contributors to mass loss on the Greenland Ice Sheet that influences global sea level rise. However, it remains unclear where meltwater runs off and what processes cause this. We measured the velocity of meltwater flow through snow on the ice sheet, which ranged from 0.17–12.8 m h−1 for vertical percolation and from 1.3–15.1 m h−1 for lateral flow. This is an important step towards understanding where, when and why meltwater runoff occurs on the ice sheet.
Wangbin Zhang, Shugui Hou, Shuang-Ye Wu, Hongxi Pang, Sharon B. Sneed, Elena V. Korotkikh, Paul A. Mayewski, Theo M. Jenk, and Margit Schwikowski
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This study proposes a quantitative method to reconstruct annual precipitation records at the millennial timescale from the Tibetan ice cores through combining annual layer identification based on LA-ICP-MS measurement with an ice flow model. The reliability of this method is assessed by comparing our results with other reconstructed and modeled precipitation series for the Tibetan Plateau. The assessment shows that the method has a promising performance.
Martin Hoelzle, Christian Hauck, Tamara Mathys, Jeannette Noetzli, Cécile Pellet, and Martin Scherler
Earth Syst. Sci. Data, 14, 1531–1547, https://doi.org/10.5194/essd-14-1531-2022, https://doi.org/10.5194/essd-14-1531-2022, 2022
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With ongoing climate change, it is crucial to understand the interactions of the individual heat fluxes at the surface and within the subsurface layers, as well as their impacts on the permafrost thermal regime. A unique set of high-altitude meteorological measurements has been analysed to determine the energy balance at three mountain permafrost sites in the Swiss Alps, where data have been collected since the late 1990s in collaboration with the Swiss Permafrost Monitoring Network (PERMOS).
Paolo Gabrielli, Theo Manuel Jenk, Michele Bertó, Giuliano Dreossi, Daniela Festi, Werner Kofler, Mai Winstrup, Klaus Oeggl, Margit Schwikowski, Barbara Stenni, and Carlo Barbante
Clim. Past Discuss., https://doi.org/10.5194/cp-2022-20, https://doi.org/10.5194/cp-2022-20, 2022
Revised manuscript not accepted
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We present a methodology that reduces the chronological uncertainty of an Alpine ice core record from the glacier Alto dell’Ortles, Italy. This chronology will allow the constraint of the Holocene climatic and environmental histories emerging from this archive of Central Europe. This method will allow to obtain accurate chronologies also from other ice cores from-low latitude/high-altitude glaciers that typically suffer from larger dating uncertainties compared with well dated polar records.
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.
Enrico Mattea, Horst Machguth, Marlene Kronenberg, Ward van Pelt, Manuela Bassi, and Martin Hoelzle
The Cryosphere, 15, 3181–3205, https://doi.org/10.5194/tc-15-3181-2021, https://doi.org/10.5194/tc-15-3181-2021, 2021
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In the near future this trend could threaten the viability of the oldest ice core record in the Alps.
To reach our conclusions, for the first time we used the meteorological data of the highest permanent weather station in Europe (Capanna Margherita, 4560 m), together with an advanced numeric simulation of the glacier.
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.
Ethan Welty, Michael Zemp, Francisco Navarro, Matthias Huss, Johannes J. Fürst, Isabelle Gärtner-Roer, Johannes Landmann, Horst Machguth, Kathrin Naegeli, Liss M. Andreassen, Daniel Farinotti, Huilin Li, and GlaThiDa Contributors
Earth Syst. Sci. Data, 12, 3039–3055, https://doi.org/10.5194/essd-12-3039-2020, https://doi.org/10.5194/essd-12-3039-2020, 2020
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Knowing the thickness of glacier ice is critical for predicting the rate of glacier loss and the myriad downstream impacts. To facilitate forecasts of future change, we have added 3 million measurements to our worldwide database of glacier thickness: 14 % of global glacier area is now within 1 km of a thickness measurement (up from 6 %). To make it easier to update and monitor the quality of our database, we have used automated tools to check and track changes to the data over time.
Jacinta Edebeli, Jürg C. Trachsel, Sven E. Avak, Markus Ammann, Martin Schneebeli, Anja Eichler, and Thorsten Bartels-Rausch
Atmos. Chem. Phys., 20, 13443–13454, https://doi.org/10.5194/acp-20-13443-2020, https://doi.org/10.5194/acp-20-13443-2020, 2020
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Earth’s snow cover is very dynamic and can change its physical properties within hours, as is well known by skiers. Snow is also a well-known host of chemical reactions – the products of which impact air composition and quality. Here, we present laboratory experiments that show how the dynamics of snow make snow essentially inert with respect to gas-phase ozone with time despite its content of reactive chemicals. Impacts on polar atmospheric chemistry are discussed.
Baptiste Vandecrux, Ruth Mottram, Peter L. Langen, Robert S. Fausto, Martin Olesen, C. Max Stevens, Vincent Verjans, Amber Leeson, Stefan Ligtenberg, Peter Kuipers Munneke, Sergey Marchenko, Ward van Pelt, Colin R. Meyer, Sebastian B. Simonsen, Achim Heilig, Samira Samimi, Shawn Marshall, Horst Machguth, Michael MacFerrin, Masashi Niwano, Olivia Miller, Clifford I. Voss, and Jason E. Box
The Cryosphere, 14, 3785–3810, https://doi.org/10.5194/tc-14-3785-2020, https://doi.org/10.5194/tc-14-3785-2020, 2020
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In the vast interior of the Greenland ice sheet, snow accumulates into a thick and porous layer called firn. Each summer, the firn retains part of the meltwater generated at the surface and buffers sea-level rise. In this study, we compare nine firn models traditionally used to quantify this retention at four sites and evaluate their performance against a set of in situ observations. We highlight limitations of certain model designs and give perspectives for future model development.
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.
Filipe Gaudie Ley Lindau, Jefferson Cardia Simões, Rafael da Rocha Ribeiro, Patrick Ginot, Barbara Delmonte, Giovanni Baccolo, Stanislav Kutuzov, Valter Maggi, and Edson Ramirez
Clim. Past Discuss., https://doi.org/10.5194/cp-2020-129, https://doi.org/10.5194/cp-2020-129, 2020
Manuscript not accepted for further review
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Glaciers are important freshwater sources in the Tropical Andes. Their retreat has been accelerating since the 1980s. This exposes fresh glacial sediments and facilitates the transport of coarse dust particles to the Nevado Illimani summit. Both the glacial area of Illimani and its ice core record of coarse dust particles respond to warmer conditions across the southern tropical Andes, and drier conditions over the Amazon basin.
Cited articles
Arkhipov, S. M., Mikhalenko, V. N., and Thompson, L. G.: Structural, stratigraphic and geochemical characteristics of the active layer of the Gregoriev Ice Cap, Tien Shan, Materialy Glyatsiologicheskikh Issledovaniy (Data of Glaciological Studies), 82, 24–32, 1997. a
Arkhipov, S. M., Mikhalenko, V. N., Kunakhovich, M. G., Dikikh, A. N., and Nagornov, O. V.: Termicheskiy reshim, uslovija l'doobrazovanija i akkumulatsija na lednike Grigor'eva (Tyan'-Shan), v 1962–2001 gg. (Thermal regime, types of ice formation and accumulation on the Grigoriev glacier (Tien Shan), 1962–2001), Materialy Glyatsiologicheskikh Issledovaniy (Data of Glaciological Studies), 96, 77–83, 2004. a, b, c, d, e, f, g, h
Avak, S. E., Trachsel, J. C., Edebeli, J., Brütsch, S., Bartels-Rausch, T., Schneebeli, M., Schwikowski, M., and Eichler, A.: Melt-Induced fractionation of major ions and trace elements in an Alpine snowpack, J. Geophys. Res.-Earth Surf., 124, 1647–1657, https://doi.org/10.1029/2019jf005026, 2019. a, b
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. a
Clerx, N., Machguth, H., Tedstone, A., Jullien, N., Wever, N., Weingartner, R., and Roessler, O.: In situ measurements of meltwater flow through snow and firn in the accumulation zone of the SW Greenland Ice Sheet, The Cryosphere, 16, 4379–4401, https://doi.org/10.5194/tc-16-4379-2022, 2022. a
Dikikh, A. N.: O temperaturnom rezhime lednikov ploskikh wershin (na primere lednika Grigor'yeva) (On the temperature regime of plateau glaciers (on the example of the Grigorev glacier)), in: Gljaziologicheskiye Issledovaniya na Tyan'-Shane, vol. XI of Raboty Tyan'-Shanskoy fizicheskoy-geograficheskoy stantsii, 32–35, Akademya Nauk Kirgizskoy SSR, Izdatel'stvo Ilim, Frunze, 1965. a, b, c, d
Eichler, A., Schwikowski, M., Gäggeler, H. W., Furrer, V., Synal, H.-A., Beer, J., Saurer, M., and Funk, M.: Glaciochemical dating of an ice core from upper Grenzgletscher (4200 m a.s.l.), J. Glaciol., 46, 507–515, https://doi.org/10.3189/172756500781833098, 2000. a, b, c
Eichler, A., Schwikowski, M., and Gäggeler, H. W.: Meltwater-induced relocation of chemical species in Alpine firn, Tellus B, 53, 192, https://doi.org/10.3402/tellusb.v53i2.16575, 2001. a, b
Eichler, A., Olivier, S., Henderson, K., Laube, A., Beer, J., Papina, T., Gäggeler, H. W., and Schwikowski, M.: Temperature response in the Altai region lags solar forcing, Geophys. Res. Lett., 36, L01808, https://doi.org/10.1029/2008GL035930, 2009. a
Eichler, A., Legrand, M., Jenk, T. M., Preunkert, S., Andersson, C., Eckhardt, S., Engardt, M., Plach, A., and Schwikowski, M.: Consistent histories of anthropogenic western European air pollution preserved in different Alpine ice cores, The Cryosphere, 17, 2119–2137, https://doi.org/10.5194/tc-17-2119-2023, 2023. a
Fujita, K., Takeuchi, N., Nikitin, S. A., Surazakov, A. B., Okamoto, S., Aizen, V. B., and Kubota, J.: Favorable climatic regime for maintaining the present-day geometry of the Gregoriev Glacier, Inner Tien Shan, The Cryosphere, 5, 539–549, https://doi.org/10.5194/tc-5-539-2011, 2011. a, b, c
Grigholm, B., Mayewski, P. A., Aizen, V., Kreutz, K., Aizen, E., Kang, S., Maasch, K. A., and Sneed, S. B.: A twentieth century major soluble ion record of dust and anthropogenic pollutants from Inilchek Glacier, Tien Shan, J. Geophys. Res.-Atmos., 122, 1884–1900, https://doi.org/10.1002/2016jd025407, 2017. a, b, c, d
Haeberli, W. and Alean, J.: Temperature and accumulation of high altitude firn in the Alps, Ann. Glaciol., 6, 161–163, 1985. a
Hoelzle, M., Darms, G., Lüthi, M. P., and Suter, S.: Evidence of accelerated englacial warming in the Monte Rosa area, Switzerland/Italy, The Cryosphere, 5, 231–243, https://doi.org/10.5194/tc-5-231-2011, 2011. a
Holmes, C. W.: Morphology and hydrology of the Mint Julep area, Southwest Greenland, in: Project Mint Julep Investigation of Smooth Ice Areas of the Greenland Ice Cap, 1953; Part II Special Scientific Reports, Arctic, Desert, Tropic Information Center; Research Studies Institute; Air University, 1955. a
Hou, S., Li, Y., Xiao, C., and Ren, J.: Recent accumulation rate at Dome A, Antarctica, Chinese Sci. Bull., 52, 428–431, https://doi.org/10.1007/s11434-007-0041-3, 2007. a
Humphrey, N. F., Harper, J. T., and Pfeffer, W. T.: Thermal tracking of meltwater retention in Greenland's accumulation area, J. Geophys. Res., 117, F01010, https://doi.org/10.1029/2011JF002083, 2012. a
Kronenberg, M., Machguth, H., Eichler, A., Schwikowski, M., and Hoelzle, M.: Comparison of historical and recent accumulation rates on Abramov Glacier, Pamir Alay, J. Glaciol., 67, 253–268, https://doi.org/10.1017/jog.2020.103, 2021. a
Kronenberg, M., Lavrentiev, I., Machguth, H., Schuppli, P., and Wicky, J.: Gregoriev firn data, Zenodo [data set], https://doi.org/10.5281/zenodo.7113282, 2022a. a
Kronenberg, M., van Pelt, W., Machguth, H., Fiddes, J., Hoelzle, M., and Pertziger, F.: Long-term firn and mass balance modelling for Abramov Glacier in the data-scarce Pamir Alay, The Cryosphere, 16, 5001–5022, https://doi.org/10.5194/tc-16-5001-2022, 2022b. a
Kutuzov, S. and Shahgedanova, M.: Glacier retreat and climatic variability in the eastern Terskey–Alatoo, inner Tien Shan between the middle of the 19th century and beginning of the 21st century, Global Planet. Change, 69, 59–70, https://doi.org/10.1016/j.gloplacha.2009.07.001, 2009. a
Lavrentiev, I., Machguth, H., and Kronenberg, M.: New data on ice thickness and internal structure of glaciers in Tien-Shan and Pamir-Alay (Kyrgyzstan), in: Practical Geography and XXI century challenges, p. 80, 2018. a
Machguth, H., MacFerrin, M., van As, D., Box, J. E., Charalampidis, C., Colgan, W., Fausto, R. S., Meijer, H. A. J., Mosley-Thompson, E., and van de Wal, R. S. W.: Greenland meltwater storage in firn limited by near-surface ice formation, Nat. Clim. Change, 6, 390–393, https://doi.org/10.1038/nclimate2899, 2016. a
Machguth, H., Eichler, A., Schwikowski, M., Brütsch, S., Mattea, E., Kutuzov, S., Heule, M., Usubaliev, R., Belekov, S., Mikhalenko, V. N., Hoelzle, M., and Kronenberg, M.: Firn core data from Grigoriev Ice Cap, 1962 to present, Zenodo [data set], https://doi.org/10.5281/zenodo.10082960, 2023. a
Mikhalenko, V. N.: Changes in Eurasian glaciation during the past century: glacier mass balance and ice-core evidence, An. Glaciol., 24, 283–287, https://doi.org/10.3189/S0260305500012313, 1997. a, b, c
Mikhalenko, V. N., Kutuzov, S. S., Fayzrakhmanov, F. F., Nagornov, . B., Thompson, L. G., Kunakhovich, M. G., Arkhipov, S. M., Dikikh, A. N., and Usubaliev, R.: Sokrashhenie oledenenija Tyan'-Shanja v XIX – nachale XXI vv.: rezul'taty kernovoro burenija i izmerenija temperatury v skvazhinakh (Glacier recession in the Tien Shan from the XIX to the beginning of the XXI century: results from ice core drilling and borehole temperature measurements), Materialy Glyatsiologicheskikh Issledovaniy (Data of Glaciological Studies), 98, 175–182, 2005. a, b, c, d, e, f, g, h, i
Moser, D. E., Thomas, E. R., Nehrbass-Ahles, C., Eichler, A., and Wolff, E.: Review article: Melt-Affected Ice Cores for (Sub-)Polar Research in a Warming World, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2023-1939, 2023. a
Nagornov, O., Konovalov, Y., and Mikhalenko, V.: Prediction of thermodynamic state of the Gregoriev ice cap, Tien Shan, central Asia, in the future, Ann. Glaciol., 43, 307–312, https://doi.org/10.3189/172756406781812221, 2006. a, b
Olivier, S., Schwikowski, M., Brütsch, S., Eyrikh, S., Gäggeler, H. W., Lüthi, M., Papina, T., Saurer, M., Schotterer, U., Tobler, L., and Vogel, E.: Glaciochemical investigation of an ice core from Belukha glacier, Siberian Altai, Geophys. Res. Lett., 30, 2019, https://doi.org/10.1029/2003gl018290, 2003. a, b
Picciotto, E. and Wilgain, S.: Fission products in Antarctic snow, a reference level for measuring accumulation, J. Geophys. Res., 68, 5965–5972, https://doi.org/10.1029/jz068i021p05965, 1963. a
Preunkert, S., Legrand, M., Kutuzov, S., Ginot, P., Mikhalenko, V., and Friedrich, R.: The Elbrus (Caucasus, Russia) ice core record – Part 1: reconstruction of past anthropogenic sulfur emissions in south-eastern Europe, Atmos. Chem. Phys., 19, 14119–14132, https://doi.org/10.5194/acp-19-14119-2019, 2019. a
Safonov, V. I.: Reshim i vodno-ledoviy balans lednika Grigorieva na Tyan'–Shane (Regime and water-ice balance of the Grigriev Glacer in the Tien Shan), Materialy Glyatsiologicheskikh Issledovaniy (Data of Glaciological Studies), 47, 204–208, 1983. a
Shun, A., Takeuchi, N., Sera, S., Fujita, K., Okamoto, S., Naoki, K., and Aizen, V. B.: Dissolved chemical ions in an ice core of Grigoriev ice cap, Kyrgyz Tien Shan, in: AGU Fall Meeting Abstracts, https://ui.adsabs.harvard.edu/abs/2012AGUFMPP41A1979S/abstract (last access: 30 November 2023), 2012. a
Takeuchi, N., Sera, S., Fujita, K., Aizen, V. B., and Kubota, J.: Annual layer counting using pollen grains of the Grigoriev ice core from the Tien Shan Mountains, central Asia, Arct. Antarct. Alp. Res., 51, 299–312, https://doi.org/10.1080/15230430.2019.1638202, 2019. a, b, c
Thompson, L., Mosley-Thompson, E., Davis, M., Lin, P., Yao, T., Dyurgerov, M., and Dal, J.: “Recent warming” ice core evidence from tropical ice cores with emphasis on Central Asia, Global Planet. Change, 7, 145–156, https://doi.org/10.1016/0921-8181(93)90046-Q, 1993. a, b
Thompson, L., Mikhalenko, V., Mosley-Thompson, E., Durgerov, M., Lin, P., Moskalevsky, M., Davis, M., Arkhipov, S., and Dail, J.: Ice core records of recent climatic variability: Grigoriev and It-Tish ice caps in Central Tien Shan, Central Asia, Materialy Glyatsiologicheskikh Issledovaniy (Data of Glaciological Studies), 81, 100–109, 1997. a, b, c, d, e, f, g, h, i, j
Usubaliev, R. A.: Khimitcheskoe zagryaznenie lednikov Tyan'-Shanya (na primere lednika Grigor'eva) (Chemical pollution of Tien Shan glaciers (on the example of Grigoriev Glacier)), Izvestija Natsional'noy Akademii Nauk Kirgizskoy Respubliki (News of the National Academy of Sciences of the Kyrgyz Republic), 4, 154–160, 2003. a, b, c, d
Van Tricht, L. and Huybrechts, P.: Thermal regime of the Grigoriev ice cap and the Sary-Tor glacier in the inner Tien Shan, Kyrgyzstan, The Cryosphere, 16, 4513–4535, https://doi.org/10.5194/tc-16-4513-2022, 2022. a, b, c
Vincent, C., Le Meur, E., Six, D., Possenti, P., Lefebvre, E., and Funk, M.: Climate warming revealed by englacial temperatures at Col du Dôme (4250 m, Mont Blanc area), Geophys. Res. Lett., 34, L16502, https://doi.org/10.1029/2007GL029933, 2007. a
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. a
Zagorodnov, V., Nagornov, O., and Thompson, L.: Influence of air temperature on a glacier's active-layer temperature, Ann. Glaciol., 43, 285–291, https://doi.org/10.3189/172756406781812203, 2006. a
Short summary
In 2018 we drilled an 18 m ice core on the summit of Grigoriev ice cap, located in the Tien Shan mountains of Kyrgyzstan. The core analysis reveals strong melting since the early 2000s. Regardless of this, we find that the structure and temperature of the ice have changed little since the 1980s. The probable cause of this apparent stability is (i) an increase in snowfall and (ii) the fact that meltwater nowadays leaves the glacier and thereby removes so-called latent heat.
In 2018 we drilled an 18 m ice core on the summit of Grigoriev ice cap, located in the Tien Shan...
