Intermittent signature of ENSO in west-Antarctic precipitation
International audience Precipitation data from the new ERA40 reanalyses and from a 200‐year simulation confirm a robust main mode of precipitation variability in west Antarctica. An intermittently strong ENSO signature is found in this mode. However, high correlation with ENSO indices appears infreq...
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ftinsu:oai:HAL:hal-00203642v1 2024-04-28T08:01:08+00:00 Intermittent signature of ENSO in west-Antarctic precipitation Genthon, Christophe Cosme, Emmanuel Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 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) 2003 https://hal.science/hal-00203642 https://hal.science/hal-00203642/document https://hal.science/hal-00203642/file/Genthon2003.pdf https://doi.org/10.1029/2003GL018280 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2003GL018280 hal-00203642 https://hal.science/hal-00203642 https://hal.science/hal-00203642/document https://hal.science/hal-00203642/file/Genthon2003.pdf doi:10.1029/2003GL018280 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-00203642 Geophysical Research Letters, 2003, 30, ⟨10.1029/2003GL018280⟩ [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 2003 ftinsu https://doi.org/10.1029/2003GL018280 2024-04-05T00:41:30Z International audience Precipitation data from the new ERA40 reanalyses and from a 200‐year simulation confirm a robust main mode of precipitation variability in west Antarctica. An intermittently strong ENSO signature is found in this mode. However, high correlation with ENSO indices appears infrequent. Thus, the high correlation found in ERA40, and previously in other chronologically realistic data, in the late 1980s and the 1990s may not be expected to last. Unlike previously suggested by others, the sign of the correlation between ENSO indices and west Antarctic precipitation, when significant, does not appear to change in time: Precipitation variability at the ENSO pace in the Bellingshausen‐Weddell (Ross‐Amunsden) region is consistently in phase (phase opposition, respectively) with the Southern Oscillation Index. This is consistent with a tropospheric wave train connecting the tropical Pacific and west Antarctic regions, which modulates in phase opposition the advection of air and moisture in the 2 regions. Article in Journal/Newspaper Antarc* Antarctic Antarctica West Antarctica Institut national des sciences de l'Univers: HAL-INSU Geophysical Research Letters 30 21 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
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] Genthon, Christophe Cosme, Emmanuel Intermittent signature of ENSO in west-Antarctic precipitation |
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 Precipitation data from the new ERA40 reanalyses and from a 200‐year simulation confirm a robust main mode of precipitation variability in west Antarctica. An intermittently strong ENSO signature is found in this mode. However, high correlation with ENSO indices appears infrequent. Thus, the high correlation found in ERA40, and previously in other chronologically realistic data, in the late 1980s and the 1990s may not be expected to last. Unlike previously suggested by others, the sign of the correlation between ENSO indices and west Antarctic precipitation, when significant, does not appear to change in time: Precipitation variability at the ENSO pace in the Bellingshausen‐Weddell (Ross‐Amunsden) region is consistently in phase (phase opposition, respectively) with the Southern Oscillation Index. This is consistent with a tropospheric wave train connecting the tropical Pacific and west Antarctic regions, which modulates in phase opposition the advection of air and moisture in the 2 regions. |
author2 |
Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 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 |
Genthon, Christophe Cosme, Emmanuel |
author_facet |
Genthon, Christophe Cosme, Emmanuel |
author_sort |
Genthon, Christophe |
title |
Intermittent signature of ENSO in west-Antarctic precipitation |
title_short |
Intermittent signature of ENSO in west-Antarctic precipitation |
title_full |
Intermittent signature of ENSO in west-Antarctic precipitation |
title_fullStr |
Intermittent signature of ENSO in west-Antarctic precipitation |
title_full_unstemmed |
Intermittent signature of ENSO in west-Antarctic precipitation |
title_sort |
intermittent signature of enso in west-antarctic precipitation |
publisher |
HAL CCSD |
publishDate |
2003 |
url |
https://hal.science/hal-00203642 https://hal.science/hal-00203642/document https://hal.science/hal-00203642/file/Genthon2003.pdf https://doi.org/10.1029/2003GL018280 |
genre |
Antarc* Antarctic Antarctica West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica West Antarctica |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-00203642 Geophysical Research Letters, 2003, 30, ⟨10.1029/2003GL018280⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2003GL018280 hal-00203642 https://hal.science/hal-00203642 https://hal.science/hal-00203642/document https://hal.science/hal-00203642/file/Genthon2003.pdf doi:10.1029/2003GL018280 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2003GL018280 |
container_title |
Geophysical Research Letters |
container_volume |
30 |
container_issue |
21 |
_version_ |
1797573023299010560 |