Control of the temperature signal in Antarctic proxies by snowfall dynamics
International audience Abstract. Antarctica, the coldest and driest continent, is home to the largest ice sheet, whose mass is predominantly recharged by snowfall. A common feature of polar regions is the warming associated with snowfall, as moist oceanic air and cloud cover increase the surface tem...
Published in: | The Cryosphere |
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Online Access: | https://hal.science/hal-04379602 https://hal.science/hal-04379602/document https://hal.science/hal-04379602/file/tc-17-5373-2023.pdf https://doi.org/10.5194/tc-17-5373-2023 |
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ftinsu:oai:HAL:hal-04379602v1 2024-04-28T08:02:19+00:00 Control of the temperature signal in Antarctic proxies by snowfall dynamics Servettaz, Aymeric, P M Agosta, Cécile Kittel, Christoph Orsi, Anaïs, J Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Glaces et Continents, Climats et Isotopes Stables (GLACCIOS) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) 2023-12-18 https://hal.science/hal-04379602 https://hal.science/hal-04379602/document https://hal.science/hal-04379602/file/tc-17-5373-2023.pdf https://doi.org/10.5194/tc-17-5373-2023 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-17-5373-2023 hal-04379602 https://hal.science/hal-04379602 https://hal.science/hal-04379602/document https://hal.science/hal-04379602/file/tc-17-5373-2023.pdf doi:10.5194/tc-17-5373-2023 info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-04379602 The Cryosphere, 2023, 17 (12), pp.5373 - 5389. ⟨10.5194/tc-17-5373-2023⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2023 ftinsu https://doi.org/10.5194/tc-17-5373-2023 2024-04-05T00:27:42Z International audience Abstract. Antarctica, the coldest and driest continent, is home to the largest ice sheet, whose mass is predominantly recharged by snowfall. A common feature of polar regions is the warming associated with snowfall, as moist oceanic air and cloud cover increase the surface temperature. Consequently, snow that accumulates on the ice sheet is deposited under unusually warm conditions. Here we use a polar-oriented regional atmospheric model to study the statistical difference between average and snowfall-weighted temperatures. During snowfall, the warm anomaly scales with snowfall amount, with the strongest sensitivity occurring at low-accumulation sites. Heavier snowfall in winter helps to decrease the annual snowfall-weighted temperature, but this effect is overwritten by the event-scale warming associated with precipitating atmospheric systems, which particularly contrast with the extremely cold conditions that occur in winter. Consequently, the seasonal range of snowfall-weighted temperature is reduced by 20 %. On the other hand, the annual snowfall-weighted temperature shows 80 % more interannual variability than the annual temperature due to the irregularity of snowfall occurrence and its associated temperature anomaly. Disturbances of the apparent annual temperature cycle and interannual variability have important consequences for the interpretation of water isotopes in precipitation, which are deposited with snowfall and commonly used for paleotemperature reconstructions from ice cores. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet The Cryosphere Institut national des sciences de l'Univers: HAL-INSU The Cryosphere 17 12 5373 5389 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Servettaz, Aymeric, P M Agosta, Cécile Kittel, Christoph Orsi, Anaïs, J Control of the temperature signal in Antarctic proxies by snowfall dynamics |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience Abstract. Antarctica, the coldest and driest continent, is home to the largest ice sheet, whose mass is predominantly recharged by snowfall. A common feature of polar regions is the warming associated with snowfall, as moist oceanic air and cloud cover increase the surface temperature. Consequently, snow that accumulates on the ice sheet is deposited under unusually warm conditions. Here we use a polar-oriented regional atmospheric model to study the statistical difference between average and snowfall-weighted temperatures. During snowfall, the warm anomaly scales with snowfall amount, with the strongest sensitivity occurring at low-accumulation sites. Heavier snowfall in winter helps to decrease the annual snowfall-weighted temperature, but this effect is overwritten by the event-scale warming associated with precipitating atmospheric systems, which particularly contrast with the extremely cold conditions that occur in winter. Consequently, the seasonal range of snowfall-weighted temperature is reduced by 20 %. On the other hand, the annual snowfall-weighted temperature shows 80 % more interannual variability than the annual temperature due to the irregularity of snowfall occurrence and its associated temperature anomaly. Disturbances of the apparent annual temperature cycle and interannual variability have important consequences for the interpretation of water isotopes in precipitation, which are deposited with snowfall and commonly used for paleotemperature reconstructions from ice cores. |
author2 |
Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Glaces et Continents, Climats et Isotopes Stables (GLACCIOS) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) |
format |
Article in Journal/Newspaper |
author |
Servettaz, Aymeric, P M Agosta, Cécile Kittel, Christoph Orsi, Anaïs, J |
author_facet |
Servettaz, Aymeric, P M Agosta, Cécile Kittel, Christoph Orsi, Anaïs, J |
author_sort |
Servettaz, Aymeric, P M |
title |
Control of the temperature signal in Antarctic proxies by snowfall dynamics |
title_short |
Control of the temperature signal in Antarctic proxies by snowfall dynamics |
title_full |
Control of the temperature signal in Antarctic proxies by snowfall dynamics |
title_fullStr |
Control of the temperature signal in Antarctic proxies by snowfall dynamics |
title_full_unstemmed |
Control of the temperature signal in Antarctic proxies by snowfall dynamics |
title_sort |
control of the temperature signal in antarctic proxies by snowfall dynamics |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04379602 https://hal.science/hal-04379602/document https://hal.science/hal-04379602/file/tc-17-5373-2023.pdf https://doi.org/10.5194/tc-17-5373-2023 |
genre |
Antarc* Antarctic Antarctica Ice Sheet The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet The Cryosphere |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-04379602 The Cryosphere, 2023, 17 (12), pp.5373 - 5389. ⟨10.5194/tc-17-5373-2023⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-17-5373-2023 hal-04379602 https://hal.science/hal-04379602 https://hal.science/hal-04379602/document https://hal.science/hal-04379602/file/tc-17-5373-2023.pdf doi:10.5194/tc-17-5373-2023 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-17-5373-2023 |
container_title |
The Cryosphere |
container_volume |
17 |
container_issue |
12 |
container_start_page |
5373 |
op_container_end_page |
5389 |
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1797573722618462208 |