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,...
Published in: | The Cryosphere |
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Online Access: | http://hdl.handle.net/10278/3701794 https://doi.org/10.5194/tc-12-1745-2018 |
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ftuniveneziairis:oai:iris.unive.it:10278/3701794 2024-04-14T08:02:11+00:00 Archival processes of the water stable isotope signal in East Antarctic ice cores Casado M. Landais A. Picard G. Munch T. Laepple T. Stenni B. Dreossi G. Ekaykin A. Arnaud L. Genthon C. Touzeau A. Masson-Delmotte V. Jouzel J. Casado, M. Landais, A. Picard, G. Munch, T. Laepple, T. Stenni, B. Dreossi, G. Ekaykin, A. Arnaud, L. Genthon, C. Touzeau, A. Masson-Delmotte, V. Jouzel, J. 2018 http://hdl.handle.net/10278/3701794 https://doi.org/10.5194/tc-12-1745-2018 unknown info:eu-repo/semantics/altIdentifier/wos/WOS:000433005400002 volume:12 issue:5 firstpage:1745 lastpage:1766 numberofpages:22 journal:THE CRYOSPHERE http://hdl.handle.net/10278/3701794 doi:10.5194/tc-12-1745-2018 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85047543153 info:eu-repo/semantics/openAccess Settore GEO/08 - Geochimica e Vulcanologia info:eu-repo/semantics/article 2018 ftuniveneziairis https://doi.org/10.5194/tc-12-1745-2018 2024-03-21T18:07:40Z 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica ice core Ice Sheet Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) Antarctic East Antarctica The Cryosphere 12 5 1745 1766 |
institution |
Open Polar |
collection |
Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) |
op_collection_id |
ftuniveneziairis |
language |
unknown |
topic |
Settore GEO/08 - Geochimica e Vulcanologia |
spellingShingle |
Settore GEO/08 - Geochimica e Vulcanologia Casado M. Landais A. Picard G. Munch T. Laepple T. Stenni B. Dreossi G. Ekaykin A. Arnaud L. Genthon C. Touzeau A. Masson-Delmotte V. Jouzel J. Archival processes of the water stable isotope signal in East Antarctic ice cores |
topic_facet |
Settore GEO/08 - Geochimica e Vulcanologia |
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. |
author2 |
Casado, M. Landais, A. Picard, G. Munch, T. Laepple, T. Stenni, B. Dreossi, G. Ekaykin, A. Arnaud, L. Genthon, C. Touzeau, A. Masson-Delmotte, V. Jouzel, J. |
format |
Article in Journal/Newspaper |
author |
Casado M. Landais A. Picard G. Munch T. Laepple T. Stenni B. Dreossi G. Ekaykin A. Arnaud L. Genthon C. Touzeau A. Masson-Delmotte V. Jouzel J. |
author_facet |
Casado M. Landais A. Picard G. Munch T. Laepple T. Stenni B. Dreossi G. Ekaykin A. Arnaud L. Genthon C. Touzeau A. Masson-Delmotte V. Jouzel J. |
author_sort |
Casado M. |
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 |
publishDate |
2018 |
url |
http://hdl.handle.net/10278/3701794 https://doi.org/10.5194/tc-12-1745-2018 |
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_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000433005400002 volume:12 issue:5 firstpage:1745 lastpage:1766 numberofpages:22 journal:THE CRYOSPHERE http://hdl.handle.net/10278/3701794 doi:10.5194/tc-12-1745-2018 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85047543153 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-12-1745-2018 |
container_title |
The Cryosphere |
container_volume |
12 |
container_issue |
5 |
container_start_page |
1745 |
op_container_end_page |
1766 |
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1796313198833434624 |