Understanding the drivers of near-surface winds in Adélie Land, East Antarctica
International audience Abstract. Near-surface winds play a crucial role in the climate of Antarctica, but accurately quantifying and understanding their drivers is complex. They result from the contribution of two distinct families of drivers: the large-scale pressure gradient and surface-induced pr...
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Online Access: | https://hal.science/hal-04573503 https://hal.science/hal-04573503/document https://hal.science/hal-04573503/file/tc-18-2239-2024.pdf https://doi.org/10.5194/tc-18-2239-2024 |
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ftinsu:oai:HAL:hal-04573503v1 2024-09-15T17:45:21+00:00 Understanding the drivers of near-surface winds in Adélie Land, East Antarctica Davrinche, Cécile Orsi, Anaïs Agosta, Cécile Amory, Charles Kittel, Christoph 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) 2024-05-03 https://hal.science/hal-04573503 https://hal.science/hal-04573503/document https://hal.science/hal-04573503/file/tc-18-2239-2024.pdf https://doi.org/10.5194/tc-18-2239-2024 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-18-2239-2024 hal-04573503 https://hal.science/hal-04573503 https://hal.science/hal-04573503/document https://hal.science/hal-04573503/file/tc-18-2239-2024.pdf doi:10.5194/tc-18-2239-2024 info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-04573503 The Cryosphere, 2024, 18 (5), pp.2239 - 2256. ⟨10.5194/tc-18-2239-2024⟩ [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 2024 ftinsu https://doi.org/10.5194/tc-18-2239-2024 2024-09-05T01:02:18Z International audience Abstract. Near-surface winds play a crucial role in the climate of Antarctica, but accurately quantifying and understanding their drivers is complex. They result from the contribution of two distinct families of drivers: the large-scale pressure gradient and surface-induced pressure gradients known as katabatic and thermal wind. The extrapolation of vertical potential temperature above the boundary layer down to the surface enables us to separate and quantify the contribution of these different pressure gradients in the momentum budget equations. Using this method applied to outputs of the regional atmospheric model MAR at a 3-hourly resolution, we find that the seasonal and spatial variability in near-surface winds in Adélie Land is dominated by surface processes. On the other hand, high-frequency temporal variability (3-hourly) is mainly controlled by large-scale variability everywhere in Antarctica, except on the coast. In coastal regions, although the katabatic acceleration surpasses all other accelerations in magnitude, none of the katabatic or large-scale accelerations can be identified as the single primary driver of near-surface wind variability. The angle between the large-scale acceleration and the surface slope is a key factor in explaining strong wind speed events: the highest-wind-speed events happen when the katabatic and large-scale forcing are aligned, although each acceleration, when acting alone, can also cause strong wind speed. This study underlines the complexity of the drivers of Antarctic surface winds and the value of the momentum budget decomposition to identify drivers at different spatial and temporal scales. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica The Cryosphere Institut national des sciences de l'Univers: HAL-INSU The Cryosphere 18 5 2239 2256 |
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 Davrinche, Cécile Orsi, Anaïs Agosta, Cécile Amory, Charles Kittel, Christoph Understanding the drivers of near-surface winds in Adélie Land, East Antarctica |
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. Near-surface winds play a crucial role in the climate of Antarctica, but accurately quantifying and understanding their drivers is complex. They result from the contribution of two distinct families of drivers: the large-scale pressure gradient and surface-induced pressure gradients known as katabatic and thermal wind. The extrapolation of vertical potential temperature above the boundary layer down to the surface enables us to separate and quantify the contribution of these different pressure gradients in the momentum budget equations. Using this method applied to outputs of the regional atmospheric model MAR at a 3-hourly resolution, we find that the seasonal and spatial variability in near-surface winds in Adélie Land is dominated by surface processes. On the other hand, high-frequency temporal variability (3-hourly) is mainly controlled by large-scale variability everywhere in Antarctica, except on the coast. In coastal regions, although the katabatic acceleration surpasses all other accelerations in magnitude, none of the katabatic or large-scale accelerations can be identified as the single primary driver of near-surface wind variability. The angle between the large-scale acceleration and the surface slope is a key factor in explaining strong wind speed events: the highest-wind-speed events happen when the katabatic and large-scale forcing are aligned, although each acceleration, when acting alone, can also cause strong wind speed. This study underlines the complexity of the drivers of Antarctic surface winds and the value of the momentum budget decomposition to identify drivers at different spatial and temporal scales. |
author2 |
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 |
Davrinche, Cécile Orsi, Anaïs Agosta, Cécile Amory, Charles Kittel, Christoph |
author_facet |
Davrinche, Cécile Orsi, Anaïs Agosta, Cécile Amory, Charles Kittel, Christoph |
author_sort |
Davrinche, Cécile |
title |
Understanding the drivers of near-surface winds in Adélie Land, East Antarctica |
title_short |
Understanding the drivers of near-surface winds in Adélie Land, East Antarctica |
title_full |
Understanding the drivers of near-surface winds in Adélie Land, East Antarctica |
title_fullStr |
Understanding the drivers of near-surface winds in Adélie Land, East Antarctica |
title_full_unstemmed |
Understanding the drivers of near-surface winds in Adélie Land, East Antarctica |
title_sort |
understanding the drivers of near-surface winds in adélie land, east antarctica |
publisher |
HAL CCSD |
publishDate |
2024 |
url |
https://hal.science/hal-04573503 https://hal.science/hal-04573503/document https://hal.science/hal-04573503/file/tc-18-2239-2024.pdf https://doi.org/10.5194/tc-18-2239-2024 |
genre |
Antarc* Antarctic Antarctica East Antarctica The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica The Cryosphere |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-04573503 The Cryosphere, 2024, 18 (5), pp.2239 - 2256. ⟨10.5194/tc-18-2239-2024⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-18-2239-2024 hal-04573503 https://hal.science/hal-04573503 https://hal.science/hal-04573503/document https://hal.science/hal-04573503/file/tc-18-2239-2024.pdf doi:10.5194/tc-18-2239-2024 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-18-2239-2024 |
container_title |
The Cryosphere |
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18 |
container_issue |
5 |
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2239 |
op_container_end_page |
2256 |
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1810493122643230720 |