Influence of the orographic roughness of glacier valleys across the Transantarctic Mountains in an atmospheric regional model
International audience Glacier valleys across the Transantarctic Mountains are not properly taken into account in climate models, because of their coarse resolution. Nonetheless, glacier valleys control katabatic winds in this region, and the latter are thought to affect the climate of the Ross Sea...
Published in: | Climate Dynamics |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2010
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Online Access: | https://hal.science/hal-00561259 https://doi.org/10.1007/S00382-010-0757-7 |
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Université Grenoble Alpes: HAL |
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English |
topic |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Jourdain, Nicolas C. Gallée, Hubert Influence of the orographic roughness of glacier valleys across the Transantarctic Mountains in an atmospheric regional model |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience Glacier valleys across the Transantarctic Mountains are not properly taken into account in climate models, because of their coarse resolution. Nonetheless, glacier valleys control katabatic winds in this region, and the latter are thought to affect the climate of the Ross Sea sector, frsater formation to snow mass balance. The purpose of this paper is to investigate the role of the production of turbulent kinetic energy by the subgrid-scale orography in the Transantarctic Mountains using a 20-km atmospheric regional model. A classical orographic roughness length parametrization is modified to produce either smooth or rough valleys. A one-year simulation shows that katabatic winds in the Transantarctic Mountains are strongly improved using smooth valleys rather than rough valleys. Pressure and temperature fields are affected by the representation of the orographic roughness, specifically in the Transantarctic Mountains and over the Ross Ice Shelf. A smooth representation of escarpment regions shows better agreement with automatic weather station observations than a rough representation. This work stresses the need to improve the representation of subgrid-scale orography to simulate realistic katabatic flows. This paper also provides a way of improving surface winds in an atmospheric model without increasing its resolution. |
author2 |
CLIPS 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)-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 |
Jourdain, Nicolas C. Gallée, Hubert |
author_facet |
Jourdain, Nicolas C. Gallée, Hubert |
author_sort |
Jourdain, Nicolas C. |
title |
Influence of the orographic roughness of glacier valleys across the Transantarctic Mountains in an atmospheric regional model |
title_short |
Influence of the orographic roughness of glacier valleys across the Transantarctic Mountains in an atmospheric regional model |
title_full |
Influence of the orographic roughness of glacier valleys across the Transantarctic Mountains in an atmospheric regional model |
title_fullStr |
Influence of the orographic roughness of glacier valleys across the Transantarctic Mountains in an atmospheric regional model |
title_full_unstemmed |
Influence of the orographic roughness of glacier valleys across the Transantarctic Mountains in an atmospheric regional model |
title_sort |
influence of the orographic roughness of glacier valleys across the transantarctic mountains in an atmospheric regional model |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://hal.science/hal-00561259 https://doi.org/10.1007/S00382-010-0757-7 |
geographic |
Ross Ice Shelf Ross Sea Transantarctic Mountains |
geographic_facet |
Ross Ice Shelf Ross Sea Transantarctic Mountains |
genre |
Ice Shelf Ross Ice Shelf Ross Sea |
genre_facet |
Ice Shelf Ross Ice Shelf Ross Sea |
op_source |
ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.science/hal-00561259 Climate Dynamics, 2010, 36 (5-6), pp.1067-1081. ⟨10.1007/S00382-010-0757-7⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/S00382-010-0757-7 hal-00561259 https://hal.science/hal-00561259 BIBCODE: 2010ClDy.tmp.27J doi:10.1007/S00382-010-0757-7 |
op_doi |
https://doi.org/10.1007/S00382-010-0757-7 |
container_title |
Climate Dynamics |
container_volume |
36 |
container_issue |
5-6 |
container_start_page |
1067 |
op_container_end_page |
1081 |
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1798847750527254528 |
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ftunigrenoble:oai:HAL:hal-00561259v1 2024-05-12T08:05:27+00:00 Influence of the orographic roughness of glacier valleys across the Transantarctic Mountains in an atmospheric regional model Jourdain, Nicolas C. Gallée, Hubert CLIPS 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)-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) 2010-03 https://hal.science/hal-00561259 https://doi.org/10.1007/S00382-010-0757-7 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/S00382-010-0757-7 hal-00561259 https://hal.science/hal-00561259 BIBCODE: 2010ClDy.tmp.27J doi:10.1007/S00382-010-0757-7 ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.science/hal-00561259 Climate Dynamics, 2010, 36 (5-6), pp.1067-1081. ⟨10.1007/S00382-010-0757-7⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2010 ftunigrenoble https://doi.org/10.1007/S00382-010-0757-7 2024-04-18T02:30:35Z International audience Glacier valleys across the Transantarctic Mountains are not properly taken into account in climate models, because of their coarse resolution. Nonetheless, glacier valleys control katabatic winds in this region, and the latter are thought to affect the climate of the Ross Sea sector, frsater formation to snow mass balance. The purpose of this paper is to investigate the role of the production of turbulent kinetic energy by the subgrid-scale orography in the Transantarctic Mountains using a 20-km atmospheric regional model. A classical orographic roughness length parametrization is modified to produce either smooth or rough valleys. A one-year simulation shows that katabatic winds in the Transantarctic Mountains are strongly improved using smooth valleys rather than rough valleys. Pressure and temperature fields are affected by the representation of the orographic roughness, specifically in the Transantarctic Mountains and over the Ross Ice Shelf. A smooth representation of escarpment regions shows better agreement with automatic weather station observations than a rough representation. This work stresses the need to improve the representation of subgrid-scale orography to simulate realistic katabatic flows. This paper also provides a way of improving surface winds in an atmospheric model without increasing its resolution. Article in Journal/Newspaper Ice Shelf Ross Ice Shelf Ross Sea Université Grenoble Alpes: HAL Ross Ice Shelf Ross Sea Transantarctic Mountains Climate Dynamics 36 5-6 1067 1081 |