Antarctic surface mass balance and systematic biases in general circulation models
International audience Atmospheric general circulation models (GCMs) simulate two of the main components of the Antarctic surface mass balance (SMB), precipitation and sublimation, which are generally assumed to dominate the SMB. Resemblances between the Antarctic SMB simulated by seven different GC...
Published in: | Journal of Geophysical Research: Atmospheres |
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Main Authors: | , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2001
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Online Access: | https://hal.archives-ouvertes.fr/hal-02915222 https://hal.archives-ouvertes.fr/hal-02915222/document https://hal.archives-ouvertes.fr/hal-02915222/file/2001JD900136.pdf https://doi.org/10.1029/2001JD900136 |
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English |
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[SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph] |
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[SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph] Genthon, Christophe Krinner, Gerhard Antarctic surface mass balance and systematic biases in general circulation models |
topic_facet |
[SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph] |
description |
International audience Atmospheric general circulation models (GCMs) simulate two of the main components of the Antarctic surface mass balance (SMB), precipitation and sublimation, which are generally assumed to dominate the SMB. Resemblances between the Antarctic SMB simulated by seven different GCMs run at high (≈100–200 km) resolution, and differences with a recently produced observation‐based map are analyzed. A number of these differences are common to all seven models. They are called systematic model biases and are summarized as a composite of all seven models. It is found unlikely that higher model resolution would significantly affect the systematic biases. All but one of the models studied here use an inaccurate prescribed topography of Antarctica, with errors as large as 1000 m. Although wrong topography does not seem to consistently explain model SMB biases, it is strongly recommended that the Antarctic topography in GCMs be updated. Wind erosion and drifting snow are not simulated in GCMs. Because the processes of wind erosion are complex and nonlinear, evaluation of its possible contribution to systematic model biases is not straightforward. Partial correspondence between regions of strongest winds and model biases suggest that wind erosion may contribute and should be formulated in GCMs. Sublimation is another significant potential negative term in the SMB of Antarctica, but it does not seem to explain any systematic model bias. Finally, it is proposed that some of the systematic differences between models and observation‐based maps actually signal errors in the latter rather than in the models. These errors occur in regions devoid of field observation. They may thus be related to the process of interpolation used to build the SMB maps. |
author2 |
Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-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 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) |
format |
Article in Journal/Newspaper |
author |
Genthon, Christophe Krinner, Gerhard |
author_facet |
Genthon, Christophe Krinner, Gerhard |
author_sort |
Genthon, Christophe |
title |
Antarctic surface mass balance and systematic biases in general circulation models |
title_short |
Antarctic surface mass balance and systematic biases in general circulation models |
title_full |
Antarctic surface mass balance and systematic biases in general circulation models |
title_fullStr |
Antarctic surface mass balance and systematic biases in general circulation models |
title_full_unstemmed |
Antarctic surface mass balance and systematic biases in general circulation models |
title_sort |
antarctic surface mass balance and systematic biases in general circulation models |
publisher |
HAL CCSD |
publishDate |
2001 |
url |
https://hal.archives-ouvertes.fr/hal-02915222 https://hal.archives-ouvertes.fr/hal-02915222/document https://hal.archives-ouvertes.fr/hal-02915222/file/2001JD900136.pdf https://doi.org/10.1029/2001JD900136 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
ISSN: 2169-897X EISSN: 2169-8996 Journal of Geophysical Research: Atmospheres https://hal.archives-ouvertes.fr/hal-02915222 Journal of Geophysical Research: Atmospheres, American Geophysical Union, 2001, 106 (D18), pp.20653-20664. ⟨10.1029/2001JD900136⟩ |
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info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2001JD900136 |
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Journal of Geophysical Research: Atmospheres |
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106 |
container_issue |
D18 |
container_start_page |
20653 |
op_container_end_page |
20664 |
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1766260994641756160 |
spelling |
ftccsdartic:oai:HAL:hal-02915222v1 2023-05-15T13:54:51+02:00 Antarctic surface mass balance and systematic biases in general circulation models Genthon, Christophe Krinner, Gerhard Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-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 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) 2001-09-27 https://hal.archives-ouvertes.fr/hal-02915222 https://hal.archives-ouvertes.fr/hal-02915222/document https://hal.archives-ouvertes.fr/hal-02915222/file/2001JD900136.pdf https://doi.org/10.1029/2001JD900136 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2001JD900136 hal-02915222 https://hal.archives-ouvertes.fr/hal-02915222 https://hal.archives-ouvertes.fr/hal-02915222/document https://hal.archives-ouvertes.fr/hal-02915222/file/2001JD900136.pdf doi:10.1029/2001JD900136 info:eu-repo/semantics/OpenAccess ISSN: 2169-897X EISSN: 2169-8996 Journal of Geophysical Research: Atmospheres https://hal.archives-ouvertes.fr/hal-02915222 Journal of Geophysical Research: Atmospheres, American Geophysical Union, 2001, 106 (D18), pp.20653-20664. ⟨10.1029/2001JD900136⟩ [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph] info:eu-repo/semantics/article Journal articles 2001 ftccsdartic https://doi.org/10.1029/2001JD900136 2021-10-24T00:06:11Z International audience Atmospheric general circulation models (GCMs) simulate two of the main components of the Antarctic surface mass balance (SMB), precipitation and sublimation, which are generally assumed to dominate the SMB. Resemblances between the Antarctic SMB simulated by seven different GCMs run at high (≈100–200 km) resolution, and differences with a recently produced observation‐based map are analyzed. A number of these differences are common to all seven models. They are called systematic model biases and are summarized as a composite of all seven models. It is found unlikely that higher model resolution would significantly affect the systematic biases. All but one of the models studied here use an inaccurate prescribed topography of Antarctica, with errors as large as 1000 m. Although wrong topography does not seem to consistently explain model SMB biases, it is strongly recommended that the Antarctic topography in GCMs be updated. Wind erosion and drifting snow are not simulated in GCMs. Because the processes of wind erosion are complex and nonlinear, evaluation of its possible contribution to systematic model biases is not straightforward. Partial correspondence between regions of strongest winds and model biases suggest that wind erosion may contribute and should be formulated in GCMs. Sublimation is another significant potential negative term in the SMB of Antarctica, but it does not seem to explain any systematic model bias. Finally, it is proposed that some of the systematic differences between models and observation‐based maps actually signal errors in the latter rather than in the models. These errors occur in regions devoid of field observation. They may thus be related to the process of interpolation used to build the SMB maps. Article in Journal/Newspaper Antarc* Antarctic Antarctica Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic The Antarctic Journal of Geophysical Research: Atmospheres 106 D18 20653 20664 |