Articles | Volume 16, issue 7
https://doi.org/10.5194/tc-16-2947-2022
© Author(s) 2022. 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-16-2947-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
22 Jul 2022
Research article |
| 22 Jul 2022
| 22 Jul 2022
Gas isotope thermometry in the South Pole and Dome Fuji ice cores provides evidence for seasonal rectification of ice core gas records
Jacob D. Morgan
CORRESPONDING AUTHOR
Scripps Institution of Oceanography, University of California, San
Diego, La Jolla, CA 92093, USA
Christo Buizert
College of Earth, Ocean, and Atmospheric Sciences, Oregon State
University, Corvallis, OR 97331, USA
Tyler J. Fudge
Department of Earth and Space Sciences, University of Washington,
Seattle, WA 98195, USA
Kenji Kawamura
National Institute of Polar Research, Tokyo 190-8518, Japan
Department of Polar Science, The Graduate University of Advanced
Studies (SOKENDAI), Tokyo 190-8518, Japan
Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka
237-0061, Japan
Jeffrey P. Severinghaus
Scripps Institution of Oceanography, University of California, San
Diego, La Jolla, CA 92093, USA
Cathy M. Trudinger
Climate Science Centre, CSIRO Oceans and Atmosphere, Aspendale,
Victoria 3195, Australia
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John D. Patterson, Murat Aydin, Andrew M. Crotwell, Gabrielle Pétron, Jeffery P. Severinghaus, Paul B. Krummel, Ray L. Langenfelds, Vasilii V. Petrenko, and Eric S. Saltzman
Clim. Past, 19, 2535–2550, https://doi.org/10.5194/cp-19-2535-2023, https://doi.org/10.5194/cp-19-2535-2023, 2023
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Xavier Faïn, David M. Etheridge, Kévin Fourteau, Patricia Martinerie, Cathy M. Trudinger, Rachael H. Rhodes, Nathan J. Chellman, Ray L. Langenfelds, Joseph R. McConnell, Mark A. J. Curran, Edward J. Brook, Thomas Blunier, Grégory Teste, Roberto Grilli, Anthony Lemoine, William T. Sturges, Boris Vannière, Johannes Freitag, and Jérôme Chappellaz
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Jenna A. Epifanio, Edward J. Brook, Christo Buizert, Erin C. Pettit, Jon S. Edwards, John M. Fegyveresi, Todd A. Sowers, Jeffrey P. Severinghaus, and Emma C. Kahle
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Benoit S. Lecavalier, Lev Tarasov, Greg Balco, Perry Spector, Claus-Dieter Hillenbrand, Christo Buizert, Catherine Ritz, Marion Leduc-Leballeur, Robert Mulvaney, Pippa L. Whitehouse, Michael J. Bentley, and Jonathan Bamber
Earth Syst. Sci. Data, 15, 3573–3596, https://doi.org/10.5194/essd-15-3573-2023, https://doi.org/10.5194/essd-15-3573-2023, 2023
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Takashi Obase, Ayako Abe-Ouchi, Fuyuki Saito, Shun Tsutaki, Shuji Fujita, Kenji Kawamura, and Hideaki Motoyama
The Cryosphere, 17, 2543–2562, https://doi.org/10.5194/tc-17-2543-2023, https://doi.org/10.5194/tc-17-2543-2023, 2023
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We use a one-dimensional ice-flow model to examine the most suitable core location near Dome Fuji (DF), Antarctica. This model computes the temporal evolution of age and temperature from past to present. We investigate the influence of different parameters of climate and ice sheet on the ice's basal age and compare the results with ground radar surveys. We find that the local ice thickness primarily controls the age because it is critical to the basal melting, which can eliminate the old ice.
Christo Buizert, Sarah Shackleton, Jeffrey P. Severinghaus, William H. G. Roberts, Alan Seltzer, Bernhard Bereiter, Kenji Kawamura, Daniel Baggenstos, Anaïs J. Orsi, Ikumi Oyabu, Benjamin Birner, Jacob D. Morgan, Edward J. Brook, David M. Etheridge, David Thornton, Nancy Bertler, Rebecca L. Pyne, Robert Mulvaney, Ellen Mosley-Thompson, Peter D. Neff, and Vasilii V. Petrenko
Clim. Past, 19, 579–606, https://doi.org/10.5194/cp-19-579-2023, https://doi.org/10.5194/cp-19-579-2023, 2023
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Michael N. Dyonisius, Vasilii V. Petrenko, Andrew M. Smith, Benjamin Hmiel, Peter D. Neff, Bin Yang, Quan Hua, Jochen Schmitt, Sarah A. Shackleton, Christo Buizert, Philip F. Place, James A. Menking, Ross Beaudette, Christina Harth, Michael Kalk, Heidi A. Roop, Bernhard Bereiter, Casey Armanetti, Isaac Vimont, Sylvia Englund Michel, Edward J. Brook, Jeffrey P. Severinghaus, Ray F. Weiss, and Joseph R. McConnell
The Cryosphere, 17, 843–863, https://doi.org/10.5194/tc-17-843-2023, https://doi.org/10.5194/tc-17-843-2023, 2023
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Cosmic rays that enter the atmosphere produce secondary particles which react with surface minerals to produce radioactive nuclides. These nuclides are often used to constrain Earth's surface processes. However, the production rates from muons are not well constrained. We measured 14C in ice with a well-known exposure history to constrain the production rates from muons. 14C production in ice is analogous to quartz, but we obtain different production rates compared to commonly used estimates.
Ikumi Oyabu, Kenji Kawamura, Shuji Fujita, Ryo Inoue, Hideaki Motoyama, Kotaro Fukui, Motohiro Hirabayashi, Yu Hoshina, Naoyuki Kurita, Fumio Nakazawa, Hiroshi Ohno, Konosuke Sugiura, Toshitaka Suzuki, Shun Tsutaki, Ayako Abe-Ouchi, Masashi Niwano, Frédéric Parrenin, Fuyuki Saito, and Masakazu Yoshimori
Clim. Past, 19, 293–321, https://doi.org/10.5194/cp-19-293-2023, https://doi.org/10.5194/cp-19-293-2023, 2023
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We reconstructed accumulation rate around Dome Fuji, Antarctica, over the last 5000 years from 15 shallow ice cores and seven snow pits. We found a long-term decreasing trend in the preindustrial period, which may be associated with secular surface cooling and sea ice expansion. Centennial-scale variations were also found, which may partly be related to combinations of volcanic, solar and greenhouse gas forcings. The most rapid and intense increases of accumulation rate occurred since 1850 CE.
Luke M. Western, Alison L. Redington, Alistair J. Manning, Cathy M. Trudinger, Lei Hu, Stephan Henne, Xuekun Fang, Lambert J. M. Kuijpers, Christina Theodoridi, David S. Godwin, Jgor Arduini, Bronwyn Dunse, Andreas Engel, Paul J. Fraser, Christina M. Harth, Paul B. Krummel, Michela Maione, Jens Mühle, Simon O'Doherty, Hyeri Park, Sunyoung Park, Stefan Reimann, Peter K. Salameh, Daniel Say, Roland Schmidt, Tanja Schuck, Carolina Siso, Kieran M. Stanley, Isaac Vimont, Martin K. Vollmer, Dickon Young, Ronald G. Prinn, Ray F. Weiss, Stephen A. Montzka, and Matthew Rigby
Atmos. Chem. Phys., 22, 9601–9616, https://doi.org/10.5194/acp-22-9601-2022, https://doi.org/10.5194/acp-22-9601-2022, 2022
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The production of ozone-destroying gases is being phased out. Even though production of one of the main ozone-depleting gases, called HCFC-141b, has been declining for many years, the amount that is being released to the atmosphere has been increasing since 2017. We do not know for sure why this is. A possible explanation is that HCFC-141b that was used to make insulating foams many years ago is only now escaping to the atmosphere, or a large part of its production is not being reported.
Shun Tsutaki, Shuji Fujita, Kenji Kawamura, Ayako Abe-Ouchi, Kotaro Fukui, Hideaki Motoyama, Yu Hoshina, Fumio Nakazawa, Takashi Obase, Hiroshi Ohno, Ikumi Oyabu, Fuyuki Saito, Konosuke Sugiura, and Toshitaka Suzuki
The Cryosphere, 16, 2967–2983, https://doi.org/10.5194/tc-16-2967-2022, https://doi.org/10.5194/tc-16-2967-2022, 2022
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Giyoon Lee, Jinho Ahn, Hyeontae Ju, Florian Ritterbusch, Ikumi Oyabu, Christo Buizert, Songyi Kim, Jangil Moon, Sambit Ghosh, Kenji Kawamura, Zheng-Tian Lu, Sangbum Hong, Chang Hee Han, Soon Do Hur, Wei Jiang, and Guo-Min Yang
The Cryosphere, 16, 2301–2324, https://doi.org/10.5194/tc-16-2301-2022, https://doi.org/10.5194/tc-16-2301-2022, 2022
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Blue-ice areas (BIAs) have several advantages for reconstructing past climate. However, the complicated ice flow in the area hinders constraining the age. We applied state-of-the-art techniques and found that the ages cover the last deglaciation period. Our study demonstrates that the BIA in northern Victoria Land may help reconstruct the past climate during the termination of the last glacial period.
Taku Umezawa, Satoshi Sugawara, Kenji Kawamura, Ikumi Oyabu, Stephen J. Andrews, Takuya Saito, Shuji Aoki, and Takakiyo Nakazawa
Atmos. Chem. Phys., 22, 6899–6917, https://doi.org/10.5194/acp-22-6899-2022, https://doi.org/10.5194/acp-22-6899-2022, 2022
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Greenhouse gas methane in the Arctic atmosphere has not been accurately reported for 1900–1980 from either direct observations or ice core reconstructions. By using trace gas data from firn (compacted snow layers above ice sheet), air samples at two Greenland sites, and a firn air transport model, this study suggests a likely range of the Arctic methane reconstruction for the 20th century. Atmospheric scenarios from two previous studies are also evaluated for consistency with the firn data sets.
Ikumi Oyabu, Kenji Kawamura, Tsutomu Uchida, Shuji Fujita, Kyotaro Kitamura, Motohiro Hirabayashi, Shuji Aoki, Shinji Morimoto, Takakiyo Nakazawa, Jeffrey P. Severinghaus, and Jacob D. Morgan
The Cryosphere, 15, 5529–5555, https://doi.org/10.5194/tc-15-5529-2021, https://doi.org/10.5194/tc-15-5529-2021, 2021
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We present O2/N2 and Ar/N2 records from the Dome Fuji ice core through the bubbly ice, bubble–clathrate transition, and clathrate ice zones without gas-loss fractionation. The insolation signal is preserved through the clathrate formation. The relationship between Ar/Ν2 and Ο2/Ν2 suggests that the fractionation for the bubble–clathrate transition is mass independent, while the bubble close-off process involves a combination of mass-independent and mass-dependent fractionation for O2 and Ar.
Sarah Shackleton, James A. Menking, Edward Brook, Christo Buizert, Michael N. Dyonisius, Vasilii V. Petrenko, Daniel Baggenstos, and Jeffrey P. Severinghaus
Clim. Past, 17, 2273–2289, https://doi.org/10.5194/cp-17-2273-2021, https://doi.org/10.5194/cp-17-2273-2021, 2021
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In this study, we measure atmospheric noble gases trapped in ice cores to reconstruct ocean temperature during the last glaciation. Comparing the new reconstruction to other climate records, we show that the ocean reached its coldest temperatures before ice sheets reached maximum volumes and atmospheric CO2 reached its lowest concentrations. Ocean cooling played a major role in lowering atmospheric CO2 early in the glaciation, but it only played a minor role later.
Benjamin Birner, William Paplawsky, Jeffrey Severinghaus, and Ralph F. Keeling
Atmos. Meas. Tech., 14, 2515–2527, https://doi.org/10.5194/amt-14-2515-2021, https://doi.org/10.5194/amt-14-2515-2021, 2021
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The atmospheric helium-to-nitrogen ratio is a promising indicator for circulation changes in the upper atmosphere and fossil fuel burning by humans. We present a very precise analysis method to determine changes in the helium-to-nitrogen ratio of air samples. The method relies on stabilizing the gas flow to a mass spectrometer and continuous removal of reactive gases. These advances enable new insights and monitoring possibilities for anthropogenic and natural processes.
Ikumi Oyabu, Kenji Kawamura, Kyotaro Kitamura, Remi Dallmayr, Akihiro Kitamura, Chikako Sawada, Jeffrey P. Severinghaus, Ross Beaudette, Anaïs Orsi, Satoshi Sugawara, Shigeyuki Ishidoya, Dorthe Dahl-Jensen, Kumiko Goto-Azuma, Shuji Aoki, and Takakiyo Nakazawa
Atmos. Meas. Tech., 13, 6703–6731, https://doi.org/10.5194/amt-13-6703-2020, https://doi.org/10.5194/amt-13-6703-2020, 2020
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Air in polar ice cores provides information on past atmosphere and climate. We present a new method for simultaneously measuring eight gases (CH4, N2O and CO2 concentrations; isotopic ratios of N2 and O2; elemental ratios between N2, O2 and Ar; and total air content) from single ice-core samples with high precision.
Jenna A. Epifanio, Edward J. Brook, Christo Buizert, Jon S. Edwards, Todd A. Sowers, Emma C. Kahle, Jeffrey P. Severinghaus, Eric J. Steig, Dominic A. Winski, Erich C. Osterberg, Tyler J. Fudge, Murat Aydin, Ekaterina Hood, Michael Kalk, Karl J. Kreutz, David G. Ferris, and Joshua A. Kennedy
Clim. Past, 16, 2431–2444, https://doi.org/10.5194/cp-16-2431-2020, https://doi.org/10.5194/cp-16-2431-2020, 2020
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A new ice core drilled at the South Pole provides a 54 000-year paleo-environmental record including the composition of the past atmosphere. This paper describes the gas chronology for the South Pole ice core, based on a high-resolution methane record. The new gas chronology, in combination with the existing ice age scale from Winski et al. (2019), allows a model-independent reconstruction of the delta age record.
Benjamin Birner, Martyn P. Chipperfield, Eric J. Morgan, Britton B. Stephens, Marianna Linz, Wuhu Feng, Chris Wilson, Jonathan D. Bent, Steven C. Wofsy, Jeffrey Severinghaus, and Ralph F. Keeling
Atmos. Chem. Phys., 20, 12391–12408, https://doi.org/10.5194/acp-20-12391-2020, https://doi.org/10.5194/acp-20-12391-2020, 2020
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With new high-precision observations from nine aircraft campaigns and 3-D chemical transport modeling, we show that the argon-to-nitrogen ratio (Ar / N2) in the lowermost stratosphere provides a useful constraint on the “age of air” (the time elapsed since entry of an air parcel into the stratosphere). Therefore, Ar / N2 in combination with traditional age-of-air indicators, such as CO2 and N2O, could provide new insights into atmospheric mixing and transport.
James E. Lee, Edward J. Brook, Nancy A. N. Bertler, Christo Buizert, Troy Baisden, Thomas Blunier, V. Gabriela Ciobanu, Howard Conway, Dorthe Dahl-Jensen, Tyler J. Fudge, Richard Hindmarsh, Elizabeth D. Keller, Frédéric Parrenin, Jeffrey P. Severinghaus, Paul Vallelonga, Edwin D. Waddington, and Mai Winstrup
Clim. Past, 16, 1691–1713, https://doi.org/10.5194/cp-16-1691-2020, https://doi.org/10.5194/cp-16-1691-2020, 2020
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The Roosevelt Island ice core was drilled to investigate climate from the eastern Ross Sea, West Antarctica. We describe the ice age-scale and gas age-scale of the ice core for 0–763 m (83 000 years BP). Old ice near the bottom of the core implies the ice dome existed throughout the last glacial period and that ice streaming was active in the region. Variations in methane, similar to those used as evidence of early human influence on climate, were observed prior to significant human populations.
Cited articles
Albert, M., Shuman, C., Courville, Z., Bauer, R., Fahnestock, M., and
Scambos, T.: Extreme firn metamorphism: impact of decades of vapor transport
on near-surface firn at a low-accumulation glazed site on the East Antarctic
plateau, Ann. Glaciol., 39, 73–78, https://doi.org/10.3189/172756404781814041, 2004.
Beem, L. H., Cavitte, M. G. P., Blankenship, D. D., Carter, S. P., Young, D.
A., Muldoon, G. R., Jackson, C. S., and Siegert, M. J.: Ice-flow
reorganization within the East Antarctic Ice Sheet deep interior, Geol. Soc. Lon. Spec. Publ., 461,
35–47, https://doi.org/10.1144/SP461.14, 2018.
Beem, L. H., Young, D. A., Greenbaum, J. S., Blankenship, D. D., Cavitte, M. G. P., Guo, J., and Bo, S.: Aerogeophysical characterization of Titan Dome, East Antarctica, and potential as an ice core target, The Cryosphere, 15, 1719–1730, https://doi.org/10.5194/tc-15-1719-2021, 2021.
Bender, M., Sowers, T. A., and Lipenkov, V.: On the concentrations of O2,
N2, and Ar in trapped gases from ice cores, J. Geophys. Res.-Atmos., 100, 18651–18660, https://doi.org/10.1029/94JD02212, 1995.
Bender, M. L.: Orbital tuning chronology for the Vostok climate record
supported by trapped gas composition, Earth Planet. Sc. Lett.,
204, 275–289, https://doi.org/10.1016/S0012-821X(02)00980-9, 2002.
Bender, M. L., Sowers, T., Barnola, J.-M., and Chappellaz, J.: Changes in
the
Bender, M. L., Barnett, B., Dreyfus, G., Jouzel, J., and Porcelli, D.: The
contemporary degassing rate of 40Ar from the solid Earth, P. Natl. Acad. Sci. USA, 105,
8232–8237, https://doi.org/10.1073/pnas.0711679105, 2008.
Bereiter, B., Kawamura, K., and Severinghaus, J. P.: New methods for
measuring atmospheric heavy noble gas isotope and elemental ratios in ice
core samples, Rapid Commun. Mass Spectrom., 32, 801–814, https://doi.org/10.1002/rcm.8099, 2018.
Blunier, T. and Schwander, J.: Gas enclosure in ice: age difference and fractionation, in: Physics of Ice Core Records, 307–326, 2000.
Brandt, R. E. and Warren, S. G.: Temperature measurements and heat transfer
in near-surface snow at the South Pole, 43, 339–351,
https://doi.org/10.3189/S0022143000003294, 1997.
Buizert, C.: The Ice Core Gas Age-Ice Age Difference as a Proxy for Surface
Temperature, J. Glaciol., 48, e2021GL094241, https://doi.org/10.1029/2021GL094241, 2021.
Buizert, C., Gkinis, V., Severinghaus, J. P., He, F., Lecavalier, B. S.,
Kindler, P., Leuenberger, M., Carlson, A. E., Vinther, B., Masson-Delmotte,
V., White, J. W. C., Liu, Z., Otto-Bliesner, B., and Brook, E. J.: Greenland
temperature response to climate forcing during the last deglaciation, Geophys. Res. Lett., 345,
1177–1180, https://doi.org/10.1126/science.1254961, 2014.
Buizert, C., Fudge, T. J., Roberts, W. H. G., Steig, E. J., Sherriff-Tadano,
S., Ritz, C., Lefebvre, E., Edwards, J., Kawamura, K., Oyabu, I., Motoyama,
H., Kahle, E. C., Jones, T. R., Abe-Ouchi, A., Obase, T., Martin, C., Corr,
H., Severinghaus, J. P., Beaudette, R., Epifanio, J. A., Brook, E. J.,
Martin, K., Chappellaz, J., Aoki, S., Nakazawa, T., Sowers, T. A., Alley, R.
B., Ahn, J., Sigl, M., Severi, M., Dunbar, N. W., Svensson, A., Fegyveresi,
J. M., He, C., Liu, Z., Zhu, J., Otto-Bliesner, B. L., Lipenkov, V. Y.,
Kageyama, M., and Schwander, J.: Antarctic surface temperature and elevation
during the Last Glacial Maximum, Science, 372, 1097–1101,
https://doi.org/10.1126/science.abd2897, 2021.
Calonne, N., Milliancourt, L., Burr, A., Philip, A., Martin, C. L., Flin,
F., and Geindreau, C.: Thermal Conductivity of Snow, Firn, and Porous Ice
From 3-D Image-Based Computations, Geophys. Res. Lett., 46, 13079–13089,
https://doi.org/10.1029/2019GL085228, 2019.
Casey, K. A., Fudge, T. J., Neumann, T. A., Steig, E. J., Cavitte, M. G. P.,
and Blankenship, D. D.: The 1500 m South Pole ice core: recovering a 40 ka
environmental record, Ann. Glaciol., 55, 137–146, https://doi.org/10.3189/2014AoG68A016,
2014.
Courville, Z. R., Albert, M. R., Fahnestock, M. A., Cathles, L. M., and
Shuman, C. A.: Impacts of an accumulation hiatus on the physical properties
of firn at a low-accumulation polar site, J. Geophys. Res.-Earth, 112, F02030,
https://doi.org/10.1029/2005JF000429, 2007.
Craig, H., Horibe, Y., and Sowers, T.: Gravitational Separation of Gases and
Isotopes in Polar Ice Caps, Science, 242, 1675–1678,
https://doi.org/10.1126/science.242.4886.1675, 1988.
Cuffey, K. M. and Paterson, W. S. B.: The Physics of Glaciers, Academic
Press, 721 pp., 2010.
Cuffey, K. M., Clow, G. D., Steig, E. J., Buizert, C., Fudge, T. J.,
Koutnik, M., Waddington, E. D., Alley, R. B., and Severinghaus, J. P.:
Deglacial temperature history of West Antarctica, P. Natl. Acad. Sci. USA, 113, 14249–14254,
https://doi.org/10.1073/pnas.1609132113, 2016.
Dahl-Jensen, D., Mosegaard, K., Gundestrup, N., Clow, G. D., Johnsen, S. J.,
Hansen, A. W., and Balling, N.: Past Temperatures Directly from the
Greenland Ice Sheet, Science, 282, 268–271,
https://doi.org/10.1126/science.282.5387.268, 1998.
Dalrymple, P. C., Lettau, H. H., and Wollaston, S. H.: South Pole
Micrometeorology Program: Data Analysis1, in: Studies in Antarctic
Meteorology, American Geophysical Union (AGU), 13–57,
https://doi.org/10.1029/AR009p0013, 1966.
Denning, A. S., Fung, I. Y., and Randall, D.: Latitudinal gradient of
atmospheric CO2 due to seasonal exchange with land biota, Nature, 376, 240–243,
https://doi.org/10.1038/376240a0, 1995.
De Rydt, J., Gudmundsson, G. H., Corr, H. F. J., and Christoffersen, P.: Surface undulations of Antarctic ice streams tightly
controlled by bedrock topography, The Cryosphere, 7, 407–417, https://doi.org/10.5194/tc-7-407-2013, 2013.
Domine, F., Belke-Brea, M., Sarrazin, D., Arnaud, L., Barrere, M., and
Poirier, M.: Soil moisture, wind speed and depth hoar formation in the
Arctic snowpack, J. Glaciol., 64, 990–1002, https://doi.org/10.1017/jog.2018.89, 2018.
Dreyfus, G. B., Jouzel, J., Bender, M. L., Landais, A., Masson-Delmotte, V.,
and Leuenberger, M.: Firn processes and δ15N: potential for a
gas-phase climate proxy, Quaternary Sci. Rev., 29, 28–42,
https://doi.org/10.1016/j.quascirev.2009.10.012, 2010.
Epifanio, J. A., Brook, E. J., Buizert, C., Edwards, J. S., Sowers, T. A., Kahle, E. C., Severinghaus, J. P., Steig, E. J., Winski, D. A., Osterberg, E. C., Fudge, T. J., Aydin, M., Hood, E., Kalk, M., Kreutz, K. J., Ferris, D. G., and Kennedy, J. A.: The SP19 chronology for the South Pole Ice Core – Part 2: gas chronology, Δage, and smoothing of atmospheric records, Clim. Past, 16, 2431–2444, https://doi.org/10.5194/cp-16-2431-2020, 2020.
Fahnestock, M. A., Shuman, C. A., Albert, M., and Scambos, T.: Satellite,
Observational, Meteorological and Thermal Records from Two Sites in the
Antarctic Megadunes – Stability of Atmospheric Forcing, Thermal Cracking,
and the Seasonal Evolution of the Thermal Profile, AGU Fall Meeting Abstracts, C31C-03, 2004.
Fudge, T. J., Biyani, S. C., Clemens-Sewall, D., and Hawley, R. L.:
Constraining Geothermal Flux at Coastal Domes of the Ross Ice Sheet,
Antarctica, 46, 13090–13098, https://doi.org/10.1029/2019GL084332, 2019.
Fudge, T. J., Lilien, D. A., Koutnik, M., Conway, H., Stevens, C. M., Waddington, E. D., Steig, E. J., Schauer, A. J., and Holschuh, N.: Advection and non-climate impacts on the South Pole Ice Core, Clim. Past, 16, 819–832, https://doi.org/10.5194/cp-16-819-2020, 2020.
Giovinetto, M. B.: Glaciological Studies on the McMurdo-South Pole Traverse,
1960–1961, Research Foundation and the
Institute of Polar Studies, The Ohio State University, 1963.
Hamilton, G. S.: Topographic control of regional accumulation rate
variability at South Pole and implications for ice-core interpretation, Ann. Glaciol., 39,
214–218, https://doi.org/10.3189/172756404781814050, 2004.
Hawley, R. L., Courville, Z. R., Kehrl, L. M., Lutz, E. R., Osterberg, E.
C., Overly, T. B., and Wong, G. J.: Recent accumulation variability in
northwest Greenland from ground-penetrating radar and shallow cores along
the Greenland Inland Traverse, J. Glaciol., 60, 375–382,
https://doi.org/10.3189/2014JoG13J141, 2014.
Herron, M. M. and Langway, C. C.: Firn Densification: An Empirical Model, J. Glaciol.,
25, 373–385, https://doi.org/10.3189/S0022143000015239, 1980.
Huber, C., Leuenberger, M., Spahni, R., Flückiger, J., Schwander, J.,
Stocker, T. F., Johnsen, S., Landais, A., and Jouzel, J.: Isotope calibrated
Greenland temperature record over Marine Isotope Stage 3 and its relation to
CH4, Earth Planet. Sc. Lett., 243, 504–519,
https://doi.org/10.1016/j.epsl.2006.01.002, 2006.
Hudson, S. R. and Brandt, R. E.: A Look at the Surface-Based Temperature
Inversion on the Antarctic Plateau, J. Climate, 18, 1673–1696,
https://doi.org/10.1175/JCLI3360.1, 2005.
Ikeda-Fukazawa, T., Hondoh, T., Fukumura, T., Fukazawa, H., and Mae, S.:
Variation in
Jordan, T. A., Martin, C., Ferraccioli, F., Matsuoka, K., Corr, H.,
Forsberg, R., Olesen, A., and Siegert, M.: Anomalously high geothermal flux
near the South Pole, Sci. Rep., 8, 16785, https://doi.org/10.1038/s41598-018-35182-0,
2018.
Jouzel, J., Barkov, N. I., Barnola, J. M., Bender, M., Chappellaz, J.,
Genthon, C., Kotlyakov, V. M., Lipenkov, V., Lorius, C., Petit, J. R.,
Raynaud, D., Raisbeck, G., Ritz, C., Sowers, T., Stievenard, M., Yiou, F.,
and Yiou, P.: Extending the Vostok ice-core record of palaeoclimate to the
penultimate glacial period, Nature, 364, 407–412, https://doi.org/10.1038/364407a0,
1993.
Jouzel, J., Masson-Delmotte, V., Cattani, O., Dreyfus, G., Falourd, S.,
Hoffmann, G., Minster, B., Nouet, J., Barnola, J. M., Chappellaz, J.,
Fischer, H., Gallet, J. C., Johnsen, S., Leuenberger, M., Loulergue, L.,
Luethi, D., Oerter, H., Parrenin, F., Raisbeck, G., Raynaud, D., Schilt, A.,
Schwander, J., Selmo, E., Souchez, R., Spahni, R., Stauffer, B., Steffensen,
J. P., Stenni, B., Stocker, T. F., Tison, J. L., Werner, M., and Wolff, E.
W.: Orbital and Millennial Antarctic Climate Variability over the Past
800,000 Years, Science, 317, 793–796, https://doi.org/10.1126/science.1141038, 2007.
Kahle, E. C., Steig, E. J., Jones, T. R., Fudge, T. J., Koutnik, M. R.,
Morris, V. A., Vaughn, B. H., Schauer, A. J., Stevens, C. M., Conway, H.,
Waddington, E. D., Buizert, C., Epifanio, J., and White, J. W. C.:
Reconstruction of Temperature, Accumulation Rate, and Layer Thinning From an
Ice Core at South Pole, Using a Statistical Inverse Method, J. Geophys. Res.-Atmos., 126,
e2020JD033300, https://doi.org/10.1029/2020JD033300, 2021.
Kawamura, K., Severinghaus, J. P., Ishidoya, S., Sugawara, S., Hashida, G.,
Motoyama, H., Fujii, Y., Aoki, S., and Nakazawa, T.: Convective mixing of
air in firn at four polar sites, Earth Planet. Sc. Lett., 244,
672–682, https://doi.org/10.1016/j.epsl.2006.02.017, 2006.
Kawamura, K., Severinghaus, J. P., Albert, M. R., Courville, Z. R., Fahnestock, M. A., Scambos, T., Shields, E., and Shuman, C. A.: Kinetic fractionation of gases by deep air convection in polar firn, Atmos. Chem. Phys., 13, 11141–11155, https://doi.org/10.5194/acp-13-11141-2013, 2013.
Kindler, P., Guillevic, M., Baumgartner, M., Schwander, J., Landais, A., and Leuenberger, M.: Temperature reconstruction from 10 to 120 kyr b2k from the NGRIP ice core, Clim. Past, 10, 887–902, https://doi.org/10.5194/cp-10-887-2014, 2014.
Kobashi, T., Severinghaus, J. P., Brook, E. J., Barnola, J.-M., and Grachev,
A. M.: Precise timing and characterization of abrupt climate change 8200
years ago from air trapped in polar ice, Quaternary Sci. Rev., 26,
1212–1222, https://doi.org/10.1016/j.quascirev.2007.01.009, 2007.
Kobashi, T., Severinghaus, J. P., and Kawamura, K.: Argon and nitrogen
isotopes of trapped air in the GISP2 ice core during the Holocene epoch
(0–11,500 B.P.): Methodology and implications for gas loss processes,
Geochim. Cosmochim. Ac., 72, 4675–4686,
https://doi.org/10.1016/j.gca.2008.07.006, 2008.
Kobashi, T., Kawamura, K., Severinghaus, J. P., Barnola, J.-M., Nakaegawa,
T., Vinther, B. M., Johnsen, S. J., and Box, J. E.: High variability of
Greenland surface temperature over the past 4000 years estimated from
trapped air in an ice core, Geophys. Res. Lett., 38, L21501, https://doi.org/10.1029/2011GL049444, 2011.
Landais, A., Barnola, J.-M., Masson-Delmotte, V., Jouzel, J., Chappellaz,
J., Caillon, N., Huber, C., Leuenberger, M., and Johnsen, S. J.: A
continuous record of temperature evolution over a sequence of
Dansgaard-Oeschger events during Marine Isotopic Stage 4 (76 to 62 kyr BP),
Geophys. Res. Lett., 31, L22211, https://doi.org/10.1029/2004GL021193,
2004.
Landais, A., Barnola, J. M., Kawamura, K., Caillon, N., Delmotte, M., Van
Ommen, T., Dreyfus, G., Jouzel, J., Masson-Delmotte, V., Minster, B.,
Freitag, J., Leuenberger, M., Schwander, J., Huber, C., Etheridge, D., and
Morgan, V.: Firn-air δ15N in modern polar sites and
glacial–interglacial ice: a model-data mismatch during glacial periods in
Antarctica?, Quaternary Sci. Rev., 25, 49–62,
https://doi.org/10.1016/j.quascirev.2005.06.007, 2006.
Leonard, K., Bell, R. E., Studinger, M., and Tremblay, B.: Anomalous
accumulation rates in the Vostok ice-core resulting from ice flow over Lake
Vostok, Geophys. Res. Lett., 31, L24401–L24401, https://doi.org/10.7916/D8W95KR0, 2004.
Leuenberger, M. and Lang, C.: Thermal diffusion: An important aspect in
studies of static air columns such as firn air, sand dunes and soil air, nternational Atomic Energy Agency, Vienna, Austria,
2002.
Lilien, D. A., Fudge, T. J., Koutnik, M. R., Conway, H., Osterberg, E. C.,
Ferris, D. G., Waddington, E. D., and Stevens, C. M.: Holocene Ice-Flow
Speedup in the Vicinity of the South Pole, Geophys. Res. Lett., 45, 6557–6565,
https://doi.org/10.1029/2018GL078253, 2018.
Mariotti, A.: Atmospheric nitrogen is a reliable standard for natural 15 N
abundance measurements, Nature, 303, 685–687,
https://doi.org/10.1038/303685a0, 1983.
Martinerie, P., Lipenkov, V. Y., Chappellaz, J., Barkov, N. I., and Lorius,
C.: Air content paleo record in the Vostok ice core (Antarctica): A mixed
record of climatic and glaciological parameters, J. Geophys. Res.-Atmos., 99, 10565–10576,
https://doi.org/10.1029/93JD03223, 1994.
Miège, C., Forster, R. R., Box, J. E., Burgess, E. W., McConnell, J. R.,
Pasteris, D. R., and Spikes, V. B.: Southeast Greenland high accumulation
rates derived from firn cores and ground-penetrating radar, 54, 322–332,
https://doi.org/10.3189/2013AoG63A358, 2013.
Morgan, J. and Severinghaus, J.: South Pole Ice Core Isotopes of N2 and Ar, USAP-DC [data set],
https://doi.org/10.15784/601517, 2022.
Orsi, A. J.: Temperature reconstruction at the West Antarctic Ice Sheet Divide, for the last millennium, from the
combination of borehole temperature and inert gas isotope measurements, PhD Thesis, UC San Diego, 2013.
Orsi, A. J., Cornuelle, B. D., and Severinghaus, J. P.: Magnitude and
temporal evolution of Dansgaard–Oeschger event 8 abrupt temperature change
inferred from nitrogen and argon isotopes in GISP2 ice using a new
least-squares inversion, Earth Planet. Sc. Lett., 395, 81–90,
https://doi.org/10.1016/j.epsl.2014.03.030, 2014.
Oyabu, I., Kawamura, K., Uchida, T., Fujita, S., Kitamura, K., Hirabayashi, M., Aoki, S., Morimoto, S., Nakazawa, T., Severinghaus, J. P., and Morgan, J. D.: Fractionation of
Petit, J. R., Jouzel, J., Raynaud, D., Barkov, N. I., J.-M. Barnola, Basile,
I., Bender, M., Chappellaz, J., Davis, M., Delaygue, G., Delmotte, M.,
Kotlyakov, V. M., Legrand, M., Lipenkov, V. Y., Lorius, C., Pépin, L.,
Ritz, C., Saltzman, E., and Stievenard, M.: Climate and atmospheric history
of the past 420,000 years from the Vostok ice core, Antarctica, Nature, 399,
429, https://doi.org/10.1038/20859, 1999.
Petrenko, V. V., Martinerie, P., Novelli, P., Etheridge, D. M., Levin, I., Wang, Z., Blunier, T., Chappellaz, J., Kaiser, J., Lang, P., Steele, L. P., Hammer, S., Mak, J., Langenfelds, R. L., Schwander, J., Severinghaus, J. P., Witrant, E., Petron, G., Battle, M. O., Forster, G., Sturges, W. T., Lamarque, J.-F., Steffen, K., and White, J. W. C.: A 60 yr record of atmospheric carbon monoxide reconstructed from Greenland firn air, Atmos. Chem. Phys., 13, 7567–7585, https://doi.org/10.5194/acp-13-7567-2013, 2013.
Pietroni, I., Argentini, S., and Petenko, I.: One Year of Surface-Based
Temperature Inversions at Dome C, Antarctica, Bound.-Lay. Meteorol., 150,
131–151, https://doi.org/10.1007/s10546-013-9861-7, 2014.
Pollard, D., Chang, W., Haran, M., Applegate, P., and DeConto, R.: Large ensemble modeling of the last deglacial retreat of the West Antarctic Ice Sheet: comparison of simple and advanced statistical techniques, Geosci. Model Dev., 9, 1697–1723, https://doi.org/10.5194/gmd-9-1697-2016, 2016.
Price, P. B., Nagornov, O. V., Bay, R., Chirkin, D., He, Y., Miocinovic, P.,
Richards, A., Woschnagg, K., Koci, B., and Zagorodnov, V.: Temperature
profile for glacial ice at the South Pole: Implications for life in a nearby
subglacial lake, P. Natl. Acad. Sci. USA, 99, 7844–7847,
https://doi.org/10.1073/pnas.082238999, 2002.
Schwander, J., Barnola, J.-M., Andrié, C., Leuenberger, M., Ludin, A.,
Raynaud, D., and Stauffer, B.: The age of the air in the firn and the ice at
Summit, Greenland, J. Geophys. Res.-Atmos., 98, 2831–2838, https://doi.org/10.1029/92JD02383, 1993.
Severinghaus, J. P. and Battle, M. O.: Fractionation of gases in polar ice
during bubble close-off: New constraints from firn air Ne, Kr and Xe
observations, Earth Planet. Sc. Lett., 244, 474–500,
https://doi.org/10.1016/j.epsl.2006.01.032, 2006.
Severinghaus, J. P. and Brook, E. J.: Abrupt Climate Change at the End of
the Last Glacial Period Inferred from Trapped Air in Polar Ice, 286, 930–934,
930–934, https://doi.org/10.1126/science.286.5441.930, 1999.
Severinghaus, J. P., Sowers, T., Brook, E. J., Alley, R. B., and Bender, M.
L.: Timing of abrupt climate change at the end of the Younger Dryas interval
from thermally fractionated gases in polar ice, Nature, 391, 141–146,
https://doi.org/10.1038/34346, 1998.
Severinghaus, J. P., Grachev, A., and Battle, M.: Thermal fractionation of
air in polar firn by seasonal temperature gradients, Geochem. Geophy. Geosy., 2, 1048,
https://doi.org/10.1029/2000GC000146, 2001.
Severinghaus, J. P., Grachev, A., Luz, B., and Caillon, N.: A method for
precise measurement of argon 40/36 and krypton/argon ratios in trapped air
in polar ice with applications to past firn thickness and abrupt climate
change in Greenland and at Siple Dome, Antarctica, Geochim.
Cosmochim. Ac., 67, 325–343,
https://doi.org/10.1016/S0016-7037(02)00965-1, 2003.
Severinghaus, J. P., Albert, M. R., Courville, Z. R., Fahnestock, M. A.,
Kawamura, K., Montzka, S. A., Mühle, J., Scambos, T. A., Shields, E.,
Shuman, C. A., Suwa, M., Tans, P., and Weiss, R. F.: Deep air convection in
the firn at a zero-accumulation site, central Antarctica, Earth
Planet. Sc. Lett., 293, 359–367,
https://doi.org/10.1016/j.epsl.2010.03.003, 2010.
Shackleton, S., Bereiter, B., Baggenstos, D., Bauska, T. K., Brook, E. J.,
Marcott, S. A., and Severinghaus, J. P.: Is the Noble Gas-Based Rate of
Ocean Warming During the Younger Dryas Overestimated?, Geophys. Res. Lett., 46, 5928–5936,
https://doi.org/10.1029/2019GL082971, 2019.
Souney, J. M., Twickler, M. S., Aydin, M., Steig, E. J., Fudge, T. J.,
Street, L. V., Nicewonger, M. R., Kahle, E. C., Johnson, J. A., Kuhl, T. W.,
Casey, K. A., Fegyveresi, J. M., Nunn, R. M., and Hargreaves, G. M.: Core
handling, transportation and processing for the South Pole ice core
(SPICEcore) project, Ann. Glaciol., 62, 118–130, https://doi.org/10.1017/aog.2020.80,
2021.
Sowers, T., Bender, M., Raynaud, D., and Korotkevich, Y. S.: δ15N of
N2 in air trapped in polar ice: A tracer of gas transport in the firn and a
possible constraint on ice age-gas age differences, J. Geophys. Res.-Atmos., 97, 15683–15697,
https://doi.org/10.1029/92JD01297, 1992.
Sowers, T. A., Bender, M. L., and Raynaud, D.: Elemental and isotopic
composition of occluded O2 and N2 in polar ice, J. Geophys.
Res.-Atmos., 94, 5137–5150,
https://doi.org/10.1029/JD094iD04p05137, 1989.
Stenni, B., Buiron, D., Frezzotti, M., Albani, S., Barbante, C., Bard, E.,
Barnola, J. M., Baroni, M., Baumgartner, M., Bonazza, M., Capron, E.,
Castellano, E., Chappellaz, J., Delmonte, B., Falourd, S., Genoni, L.,
Iacumin, P., Jouzel, J., Kipfstuhl, S., Landais, A., Lemieux-Dudon, B.,
Maggi, V., Masson-Delmotte, V., Mazzola, C., Minster, B., Montagnat, M.,
Mulvaney, R., Narcisi, B., Oerter, H., Parrenin, F., Petit, J. R., Ritz, C.,
Scarchilli, C., Schilt, A., Schüpbach, S., Schwander, J., Selmo, E.,
Severi, M., Stocker, T. F., and Udisti, R.: Expression of the bipolar
see-saw in Antarctic climate records during the last deglaciation, Nat Geosci., 4,
Sturm, M. and Johnson, J. B.: Natural convection in the subarctic snow
cover, Quaternary Sci. Rev., 96, 11657–11671, https://doi.org/10.1029/91JB00895, 1991.
Suwa, M. and Bender, M. L.: Chronology of the Vostok ice core constrained by
Suwa, M. and Bender, M. L.:
Town, M. S., Waddington, E. D., Walden, V. P., and Warren, S. G.:
Temperatures, heating rates and vapour pressures in near-surface snow at the
South Pole, J. Glaciol., 54, 487–498, https://doi.org/10.3189/002214308785837075, 2008.
Trudinger, C. M., Etheridge, D. M., Buizert, C., Hmiel, B., Krummel, P. B.,
Langenfelds, R. L., Manning, M., Mitrevski, B., Neff, P. D., Petrenko, V.
V., Severinghaus, J. P., Smith, A. M., and Vollmer, M. K.: Rectifier Effect
due to Seasonality in Convective Mixing in Firn, 2020, AGU Fall
Meeting Abstracts, C033-02, 2020.
Uemura, R., Motoyama, H., Masson-Delmotte, V., Jouzel, J., Kawamura, K.,
Goto-Azuma, K., Fujita, S., Kuramoto, T., Hirabayashi, M., Miyake, T., Ohno,
H., Fujita, K., Abe-Ouchi, A., Iizuka, Y., Horikawa, S., Igarashi, M.,
Suzuki, K., Suzuki, T., and Fujii, Y.: Asynchrony between Antarctic
temperature and CO2 associated with obliquity over the past 720,000 years,
Nat. Commun., 9, 961, https://doi.org/10.1038/s41467-018-03328-3, 2018.
van den Broeke, M. R. and van Lipzig, N. P. M.: Factors Controlling the
Near-Surface Wind Field in Antarctica, Mon. Weather Rev., 131, 733–743,
https://doi.org/10.1175/1520-0493(2003)131<0733:FCTNSW>2.0.CO;2, 2003.
Van Liefferinge, B. and Pattyn, F.: Using ice-flow models to evaluate potential sites of million year-old ice in Antarctica, Clim. Past, 9, 2335–2345, https://doi.org/10.5194/cp-9-2335-2013, 2013.
Verhulst, K. R.: Atmospheric Histories of Ethane and Carbon Monoxide from Polar Firn Air and Ice Cores, PhD Thesis,
UC Irvine, 2014.
Vihma, T., Tuovinen, E., and Savijärvi, H.: Interaction of katabatic
winds and near-surface temperatures in the Antarctic, J. Geophys. Res.-Atmos., 116, D21119,
https://doi.org/10.1029/2010JD014917, 2011.
Waddington, E. D., Neumann, T. A., Koutnik, M. R., Marshall, H.-P., and
Morse, D. L.: Inference of accumulation-rate patterns from deep layers in
glaciers and ice sheets, J. Glaciol., 53, 694–712,
https://doi.org/10.3189/002214307784409351, 2007.
Weiler, K., Schwander, J., Leuenberger, M., Blunier, T., Mulvaney, R.,
Anderson, P. S., Salmon, R., and Sturges, W. T.: Seasonal Variations of
Isotope Ratios and CO2 Concentrations in Firn Air, Science, 68, 247–272, 2009.
Winski, D. A., Fudge, T. J., Ferris, D. G., Osterberg, E. C., Fegyveresi, J. M., Cole-Dai, J., Thundercloud, Z., Cox, T. S., Kreutz, K. J., Ortman, N., Buizert, C., Epifanio, J., Brook, E. J., Beaudette, R., Severinghaus, J., Sowers, T., Steig, E. J., Kahle, E. C., Jones, T. R., Morris, V., Aydin, M., Nicewonger, M. R., Casey, K. A., Alley, R. B., Waddington, E. D., Iverson, N. A., Dunbar, N. W., Bay, R. C., Souney, J. M., Sigl, M., and McConnell, J. R.: The SP19 chronology for the South Pole Ice Core – Part 1: volcanic matching and annual layer counting, Clim. Past, 15, 1793–1808, https://doi.org/10.5194/cp-15-1793-2019, 2019.
Short summary
The composition of air bubbles in Antarctic ice cores records information about past changes in properties of the snowpack. We find that, near the South Pole, thinner snowpack in the past is often due to steeper surface topography, in which faster winds erode the snow and deposit it in flatter areas. The slope and wind seem to also cause a seasonal bias in the composition of air bubbles in the ice core. These findings will improve interpretation of other ice cores from places with steep slopes.
The composition of air bubbles in Antarctic ice cores records information about past changes in...
