Free and laterally-nudged Antarctic climate of an Atmospheric general Circulation Model
International audience Because many of the synoptic cyclones south of the 60°S parallel originate from 60°S and lower latitudes, nudging an atmospheric general circulation model (AGCM) with meteorological analyses at the periphery of the Antarctic region may be expected to exert a strong control on...
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Language: | English |
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HAL CCSD
2002
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Online Access: | https://hal.science/hal-00203651 https://hal.science/hal-00203651/document https://hal.science/hal-00203651/file/b_Genthon2002.pdf https://doi.org/10.1175/1520-0493(2002)130<1601:FALNAC>2.0.CO;2 |
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ftunivsavoie:oai:HAL:hal-00203651v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université Savoie Mont Blanc: HAL |
op_collection_id |
ftunivsavoie |
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 Krinner, Gerhard Cosme, Emmanuel Free and laterally-nudged Antarctic climate of an Atmospheric general Circulation Model |
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 Because many of the synoptic cyclones south of the 60°S parallel originate from 60°S and lower latitudes, nudging an atmospheric general circulation model (AGCM) with meteorological analyses at the periphery of the Antarctic region may be expected to exert a strong control on the atmospheric circulation inside the region. Here, the ECMWF reanalyses are used to nudge the atmospheric circulation of the Laboratoire de Météorologie Dynamique Zoom (LMDZ) stretched-grid AGCM in a 15-yr simulation spanning the 1979–93 period. The horizontal resolution (grid spacing) in the model reaches ∼100 km south of 60°S. Nudging is exerted along the 60°S parallel, and this is called lateral nudging for the Antarctic region. Nudging is also performed farther north, near 50° and 40°S, but this is not essential for the results discussed here. Surface pressure and winds in the atmospheric column are nudged without relaxation to maximize control by the meteorological analyses, at the expense of some “noise” confined to the latitudes where nudging is exerted. The performances of lateral nudging are evaluated with respect to station observations, the free (unnudged) model, the ECMWF reanalyses, and in limited instances with respect to nudging the surface pressure only. It is shown that the free model has limited but persistent surface pressure and geopotential defects in the Antarctic region, which are efficiently corrected by lateral nudging. Also, the laterally nudged simulations confirm, and to some extent correct, a geopotential deficiency of the ECMWF reanalyses over the east Antarctic continent previously identified by others. The monthly mean variability of surface climate at several stations along a coast-to-pole transect is analyzed. A significant fraction of the observed variability of surface pressure and temperature is reproduced. The fraction is often less than in the reanalyses. However, the differences are not large considering that the nudged model is forced at distances of hundreds to thousands ... |
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) |
format |
Article in Journal/Newspaper |
author |
Genthon, Christophe Krinner, Gerhard Cosme, Emmanuel |
author_facet |
Genthon, Christophe Krinner, Gerhard Cosme, Emmanuel |
author_sort |
Genthon, Christophe |
title |
Free and laterally-nudged Antarctic climate of an Atmospheric general Circulation Model |
title_short |
Free and laterally-nudged Antarctic climate of an Atmospheric general Circulation Model |
title_full |
Free and laterally-nudged Antarctic climate of an Atmospheric general Circulation Model |
title_fullStr |
Free and laterally-nudged Antarctic climate of an Atmospheric general Circulation Model |
title_full_unstemmed |
Free and laterally-nudged Antarctic climate of an Atmospheric general Circulation Model |
title_sort |
free and laterally-nudged antarctic climate of an atmospheric general circulation model |
publisher |
HAL CCSD |
publishDate |
2002 |
url |
https://hal.science/hal-00203651 https://hal.science/hal-00203651/document https://hal.science/hal-00203651/file/b_Genthon2002.pdf https://doi.org/10.1175/1520-0493(2002)130<1601:FALNAC>2.0.CO;2 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 0027-0644 EISSN: 1520-0493 Monthly Weather Review https://hal.science/hal-00203651 Monthly Weather Review, 2002, 130, pp.1601-1616. ⟨10.1175/1520-0493(2002)1302.0.CO;2⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/1520-0493(2002)130<1601:FALNAC>2.0.CO;2 hal-00203651 https://hal.science/hal-00203651 https://hal.science/hal-00203651/document https://hal.science/hal-00203651/file/b_Genthon2002.pdf doi:10.1175/1520-0493(2002)130<1601:FALNAC>2.0.CO;2 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/1520-0493(2002)130<1601:FALNAC>2.0.CO;210.1175/1520-0493(2002)1302.0.CO;2 |
_version_ |
1797573191513669632 |
spelling |
ftunivsavoie:oai:HAL:hal-00203651v1 2024-04-28T08:01:27+00:00 Free and laterally-nudged Antarctic climate of an Atmospheric general Circulation Model Genthon, Christophe Krinner, Gerhard 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) 2002 https://hal.science/hal-00203651 https://hal.science/hal-00203651/document https://hal.science/hal-00203651/file/b_Genthon2002.pdf https://doi.org/10.1175/1520-0493(2002)130<1601:FALNAC>2.0.CO;2 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/1520-0493(2002)130<1601:FALNAC>2.0.CO;2 hal-00203651 https://hal.science/hal-00203651 https://hal.science/hal-00203651/document https://hal.science/hal-00203651/file/b_Genthon2002.pdf doi:10.1175/1520-0493(2002)130<1601:FALNAC>2.0.CO;2 info:eu-repo/semantics/OpenAccess ISSN: 0027-0644 EISSN: 1520-0493 Monthly Weather Review https://hal.science/hal-00203651 Monthly Weather Review, 2002, 130, pp.1601-1616. ⟨10.1175/1520-0493(2002)1302.0.CO;2⟩ [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 2002 ftunivsavoie https://doi.org/10.1175/1520-0493(2002)130<1601:FALNAC>2.0.CO;210.1175/1520-0493(2002)1302.0.CO;2 2024-04-11T00:48:25Z International audience Because many of the synoptic cyclones south of the 60°S parallel originate from 60°S and lower latitudes, nudging an atmospheric general circulation model (AGCM) with meteorological analyses at the periphery of the Antarctic region may be expected to exert a strong control on the atmospheric circulation inside the region. Here, the ECMWF reanalyses are used to nudge the atmospheric circulation of the Laboratoire de Météorologie Dynamique Zoom (LMDZ) stretched-grid AGCM in a 15-yr simulation spanning the 1979–93 period. The horizontal resolution (grid spacing) in the model reaches ∼100 km south of 60°S. Nudging is exerted along the 60°S parallel, and this is called lateral nudging for the Antarctic region. Nudging is also performed farther north, near 50° and 40°S, but this is not essential for the results discussed here. Surface pressure and winds in the atmospheric column are nudged without relaxation to maximize control by the meteorological analyses, at the expense of some “noise” confined to the latitudes where nudging is exerted. The performances of lateral nudging are evaluated with respect to station observations, the free (unnudged) model, the ECMWF reanalyses, and in limited instances with respect to nudging the surface pressure only. It is shown that the free model has limited but persistent surface pressure and geopotential defects in the Antarctic region, which are efficiently corrected by lateral nudging. Also, the laterally nudged simulations confirm, and to some extent correct, a geopotential deficiency of the ECMWF reanalyses over the east Antarctic continent previously identified by others. The monthly mean variability of surface climate at several stations along a coast-to-pole transect is analyzed. A significant fraction of the observed variability of surface pressure and temperature is reproduced. The fraction is often less than in the reanalyses. However, the differences are not large considering that the nudged model is forced at distances of hundreds to thousands ... Article in Journal/Newspaper Antarc* Antarctic Université Savoie Mont Blanc: HAL |