Archival processes of the water stable isotope signal in East Antarctic ice cores
The oldest ice core records are obtained from the East Antarctic Plateau. Water isotopes are key proxies to reconstructing past climatic conditions over the ice sheet and at the evaporation source. The accuracy of climate reconstructions depends on knowledge of all processes affecting water vapour,...
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ftdatacite:10.25932/publishup-42705 2023-05-15T13:39:54+02:00 Archival processes of the water stable isotope signal in East Antarctic ice cores Casado, Mathieu Landais, Amaelle Picard, Ghislain Münch, Thomas Laepple, Thomas Stenni, Barbara Dreossi, Giuliano Ekaykin, Alexey Arnaud, Laurent Genthon, Christophe Touzeau, Alexandra Masson-Delmotte, Valerie Jouzel, Jean 2019 application/zip application/pdf https://dx.doi.org/10.25932/publishup-42705 https://publishup.uni-potsdam.de/42705 en eng Universität Potsdam Creative Commons - Namensnennung, 4.0 International https://creativecommons.org/licenses/by/4.0 CC-BY article-journal Text ScholarlyArticle 2019 ftdatacite https://doi.org/10.25932/publishup-42705 2021-11-05T12:55:41Z The oldest ice core records are obtained from the East Antarctic Plateau. Water isotopes are key proxies to reconstructing past climatic conditions over the ice sheet and at the evaporation source. The accuracy of climate reconstructions depends on knowledge of all processes affecting water vapour, precipitation and snow isotopic compositions. Fractionation processes are well understood and can be integrated in trajectory-based Rayleigh distillation and isotope-enabled climate models. However, a quantitative understanding of processes potentially altering snow isotopic composition after deposition is still missing. In low-accumulation sites, such as those found in East Antarctica, these poorly constrained processes are likely to play a significant role and limit the interpretability of an ice core's isotopic composition. By combining observations of isotopic composition in vapour, precipitation, surface snow and buried snow from Dome C, a deep ice core site on the East Antarctic Plateau, we found indications of a seasonal impact of metamorphism on the surface snow isotopic signal when compared to the initial precipitation. Particularly in summer, exchanges of water molecules between vapour and snow are driven by the diurnal sublimation-condensation cycles. Overall, we observe in between precipitation events modification of the surface snow isotopic composition. Using high-resolution water isotopic composition profiles from snow pits at five Antarctic sites with different accumulation rates, we identified common patterns which cannot be attributed to the seasonal variability of precipitation. These differences in the precipitation, surface snow and buried snow isotopic composition provide evidence of post-deposition processes affecting ice core records in low-accumulation areas. : Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe, 716 Text Antarc* Antarctic Antarctica East Antarctica ice core Ice Sheet DataCite Metadata Store (German National Library of Science and Technology) Antarctic East Antarctica |
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DataCite Metadata Store (German National Library of Science and Technology) |
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ftdatacite |
language |
English |
description |
The oldest ice core records are obtained from the East Antarctic Plateau. Water isotopes are key proxies to reconstructing past climatic conditions over the ice sheet and at the evaporation source. The accuracy of climate reconstructions depends on knowledge of all processes affecting water vapour, precipitation and snow isotopic compositions. Fractionation processes are well understood and can be integrated in trajectory-based Rayleigh distillation and isotope-enabled climate models. However, a quantitative understanding of processes potentially altering snow isotopic composition after deposition is still missing. In low-accumulation sites, such as those found in East Antarctica, these poorly constrained processes are likely to play a significant role and limit the interpretability of an ice core's isotopic composition. By combining observations of isotopic composition in vapour, precipitation, surface snow and buried snow from Dome C, a deep ice core site on the East Antarctic Plateau, we found indications of a seasonal impact of metamorphism on the surface snow isotopic signal when compared to the initial precipitation. Particularly in summer, exchanges of water molecules between vapour and snow are driven by the diurnal sublimation-condensation cycles. Overall, we observe in between precipitation events modification of the surface snow isotopic composition. Using high-resolution water isotopic composition profiles from snow pits at five Antarctic sites with different accumulation rates, we identified common patterns which cannot be attributed to the seasonal variability of precipitation. These differences in the precipitation, surface snow and buried snow isotopic composition provide evidence of post-deposition processes affecting ice core records in low-accumulation areas. : Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe, 716 |
format |
Text |
author |
Casado, Mathieu Landais, Amaelle Picard, Ghislain Münch, Thomas Laepple, Thomas Stenni, Barbara Dreossi, Giuliano Ekaykin, Alexey Arnaud, Laurent Genthon, Christophe Touzeau, Alexandra Masson-Delmotte, Valerie Jouzel, Jean |
spellingShingle |
Casado, Mathieu Landais, Amaelle Picard, Ghislain Münch, Thomas Laepple, Thomas Stenni, Barbara Dreossi, Giuliano Ekaykin, Alexey Arnaud, Laurent Genthon, Christophe Touzeau, Alexandra Masson-Delmotte, Valerie Jouzel, Jean Archival processes of the water stable isotope signal in East Antarctic ice cores |
author_facet |
Casado, Mathieu Landais, Amaelle Picard, Ghislain Münch, Thomas Laepple, Thomas Stenni, Barbara Dreossi, Giuliano Ekaykin, Alexey Arnaud, Laurent Genthon, Christophe Touzeau, Alexandra Masson-Delmotte, Valerie Jouzel, Jean |
author_sort |
Casado, Mathieu |
title |
Archival processes of the water stable isotope signal in East Antarctic ice cores |
title_short |
Archival processes of the water stable isotope signal in East Antarctic ice cores |
title_full |
Archival processes of the water stable isotope signal in East Antarctic ice cores |
title_fullStr |
Archival processes of the water stable isotope signal in East Antarctic ice cores |
title_full_unstemmed |
Archival processes of the water stable isotope signal in East Antarctic ice cores |
title_sort |
archival processes of the water stable isotope signal in east antarctic ice cores |
publisher |
Universität Potsdam |
publishDate |
2019 |
url |
https://dx.doi.org/10.25932/publishup-42705 https://publishup.uni-potsdam.de/42705 |
geographic |
Antarctic East Antarctica |
geographic_facet |
Antarctic East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica ice core Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica ice core Ice Sheet |
op_rights |
Creative Commons - Namensnennung, 4.0 International https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.25932/publishup-42705 |
_version_ |
1766125964672106496 |