A "low level" explanation for the recent large warming trend over the western Antarctic Peninsula involving blocked winds and changes in zonal circulation
International audience We demonstrate a mechanism whereby the impact of stronger circumpolar westerly winds on the mountains of the Antarctic Peninsula contributes significantly to the enhanced warming trend observed over its western side in the last 50 years. Numerical and laboratory meteorological...
Published in: | Geophysical Research Letters |
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Format: | Article in Journal/Newspaper |
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Online Access: | https://hal.science/hal-00260756 https://hal.science/hal-00260756/document https://hal.science/hal-00260756/file/Orr2004.pdf https://doi.org/10.1029/2003GL019160 |
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ftunigrenoble:oai:HAL:hal-00260756v1 2024-05-12T07:54:08+00:00 A "low level" explanation for the recent large warming trend over the western Antarctic Peninsula involving blocked winds and changes in zonal circulation Orr, Andrew Cresswell, Doug Marshall, Gareth J. Hunt, Julian C. R. Sommeria, Joël Wang, Chang-Gui Light, M. Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) 2004 https://hal.science/hal-00260756 https://hal.science/hal-00260756/document https://hal.science/hal-00260756/file/Orr2004.pdf https://doi.org/10.1029/2003GL019160 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2003GL019160 hal-00260756 https://hal.science/hal-00260756 https://hal.science/hal-00260756/document https://hal.science/hal-00260756/file/Orr2004.pdf doi:10.1029/2003GL019160 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-00260756 Geophysical Research Letters, 2004, 31, ⟨10.1029/2003GL019160⟩ [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] info:eu-repo/semantics/article Journal articles 2004 ftunigrenoble https://doi.org/10.1029/2003GL019160 2024-04-18T03:37:33Z International audience We demonstrate a mechanism whereby the impact of stronger circumpolar westerly winds on the mountains of the Antarctic Peninsula contributes significantly to the enhanced warming trend observed over its western side in the last 50 years. Numerical and laboratory meteorological modelling demonstrate how, when westerly winds impinge on this side, warm air below the height (1.5–2.0 km) of the Peninsula is advected in a southerly direction. The strength of the annual mean westerly winds has increased by about 15–20% since the 1960s, while the modelling results indicate that contemporaneously the air advected to its western side originates from an increasingly northerly (and warmer) location. This gives rise to increased northerlies and a greater transport of warm air into this region. Consequently there is a reduction in the sea-ice extent, further amplifying the local warming. This ‘low-level’, orographic mechanism for the local climate trend is supported by observational evidence. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Sea ice Université Grenoble Alpes: HAL Antarctic Antarctic Peninsula The Antarctic Geophysical Research Letters 31 6 n/a n/a |
institution |
Open Polar |
collection |
Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
language |
English |
topic |
[PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] |
spellingShingle |
[PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] Orr, Andrew Cresswell, Doug Marshall, Gareth J. Hunt, Julian C. R. Sommeria, Joël Wang, Chang-Gui Light, M. A "low level" explanation for the recent large warming trend over the western Antarctic Peninsula involving blocked winds and changes in zonal circulation |
topic_facet |
[PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] |
description |
International audience We demonstrate a mechanism whereby the impact of stronger circumpolar westerly winds on the mountains of the Antarctic Peninsula contributes significantly to the enhanced warming trend observed over its western side in the last 50 years. Numerical and laboratory meteorological modelling demonstrate how, when westerly winds impinge on this side, warm air below the height (1.5–2.0 km) of the Peninsula is advected in a southerly direction. The strength of the annual mean westerly winds has increased by about 15–20% since the 1960s, while the modelling results indicate that contemporaneously the air advected to its western side originates from an increasingly northerly (and warmer) location. This gives rise to increased northerlies and a greater transport of warm air into this region. Consequently there is a reduction in the sea-ice extent, further amplifying the local warming. This ‘low-level’, orographic mechanism for the local climate trend is supported by observational evidence. |
author2 |
Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Orr, Andrew Cresswell, Doug Marshall, Gareth J. Hunt, Julian C. R. Sommeria, Joël Wang, Chang-Gui Light, M. |
author_facet |
Orr, Andrew Cresswell, Doug Marshall, Gareth J. Hunt, Julian C. R. Sommeria, Joël Wang, Chang-Gui Light, M. |
author_sort |
Orr, Andrew |
title |
A "low level" explanation for the recent large warming trend over the western Antarctic Peninsula involving blocked winds and changes in zonal circulation |
title_short |
A "low level" explanation for the recent large warming trend over the western Antarctic Peninsula involving blocked winds and changes in zonal circulation |
title_full |
A "low level" explanation for the recent large warming trend over the western Antarctic Peninsula involving blocked winds and changes in zonal circulation |
title_fullStr |
A "low level" explanation for the recent large warming trend over the western Antarctic Peninsula involving blocked winds and changes in zonal circulation |
title_full_unstemmed |
A "low level" explanation for the recent large warming trend over the western Antarctic Peninsula involving blocked winds and changes in zonal circulation |
title_sort |
"low level" explanation for the recent large warming trend over the western antarctic peninsula involving blocked winds and changes in zonal circulation |
publisher |
HAL CCSD |
publishDate |
2004 |
url |
https://hal.science/hal-00260756 https://hal.science/hal-00260756/document https://hal.science/hal-00260756/file/Orr2004.pdf https://doi.org/10.1029/2003GL019160 |
geographic |
Antarctic Antarctic Peninsula The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Sea ice |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-00260756 Geophysical Research Letters, 2004, 31, ⟨10.1029/2003GL019160⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2003GL019160 hal-00260756 https://hal.science/hal-00260756 https://hal.science/hal-00260756/document https://hal.science/hal-00260756/file/Orr2004.pdf doi:10.1029/2003GL019160 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2003GL019160 |
container_title |
Geophysical Research Letters |
container_volume |
31 |
container_issue |
6 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1798846950246711296 |