A low-level explanation for the recent large warming trend over the western Antarctic peninsula invloving 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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Language: | English |
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Online Access: | https://hal.science/hal-00260954 https://doi.org/10.1029/2003GL019160 |
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ftunigrenoble:oai:HAL:hal-00260954v1 2024-05-12T07:54:14+00:00 A low-level explanation for the recent large warming trend over the western Antarctic peninsula invloving 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) Nice, France 2004-04-25 https://hal.science/hal-00260954 https://doi.org/10.1029/2003GL019160 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.1029/2003GL019160 hal-00260954 https://hal.science/hal-00260954 doi:10.1029/2003GL019160 General Assembly European Geoscience Union https://hal.science/hal-00260954 General Assembly European Geoscience Union, Apr 2004, Nice, France. ⟨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/conferenceObject Conference papers 2004 ftunigrenoble https://doi.org/10.1029/2003GL019160 2024-04-18T03:33:48Z 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. Conference Object 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 invloving 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 |
Conference Object |
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 invloving blocked winds and changes in zonal circulation |
title_short |
A low-level explanation for the recent large warming trend over the western Antarctic peninsula invloving blocked winds and changes in zonal circulation |
title_full |
A low-level explanation for the recent large warming trend over the western Antarctic peninsula invloving blocked winds and changes in zonal circulation |
title_fullStr |
A low-level explanation for the recent large warming trend over the western Antarctic peninsula invloving 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 invloving blocked winds and changes in zonal circulation |
title_sort |
low-level explanation for the recent large warming trend over the western antarctic peninsula invloving blocked winds and changes in zonal circulation |
publisher |
HAL CCSD |
publishDate |
2004 |
url |
https://hal.science/hal-00260954 https://doi.org/10.1029/2003GL019160 |
op_coverage |
Nice, France |
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 |
General Assembly European Geoscience Union https://hal.science/hal-00260954 General Assembly European Geoscience Union, Apr 2004, Nice, France. ⟨10.1029/2003GL019160⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2003GL019160 hal-00260954 https://hal.science/hal-00260954 doi:10.1029/2003GL019160 |
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_ |
1798847707738013696 |