Evaluation of a high-resolution regional climate simulation over Greenland
International audience A simulation of the 1991 summer has been performed over south Greenland with a coupled atmosphere-snow regional climate model (RCM) forced by the ECMWF re-analysis. The simulation is evaluated with in-situ coastal and ice-sheet atmospheric and glaciological observations. Model...
Published in: | Climate Dynamics |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2005
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-00374621 https://doi.org/10.1007/s00382-005-0005-8 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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English |
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[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Lefebre, Filip Fettweis, Xavier Gallée, Hubert Van Ypersele, Jean-Pascal Marbaix, Philippe Greuell, Wouter Calanca, Pierluigi Evaluation of a high-resolution regional climate simulation over Greenland |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience A simulation of the 1991 summer has been performed over south Greenland with a coupled atmosphere-snow regional climate model (RCM) forced by the ECMWF re-analysis. The simulation is evaluated with in-situ coastal and ice-sheet atmospheric and glaciological observations. Modelled air temperature, specific humidity, wind speed and radiative fluxes are in good agreement with the available observations, although uncertainties in the radiative transfer scheme need further investigation to improve the model's performance. In the sub-surface snow-ice model, surface albedo is calculated from the simulated snow grain shape and size, snow depth, meltwater accumulation, cloudiness and ice albedo. The use of snow metamorphism processes allows a realistic modelling of the temporal variations in the surface albedo during both melting periods and accumulation events. Concerning the surface albedo, the main finding is that an accurate albedo simulation during the melting season strongly depends on a proper initialization of the surface conditions which mainly result from winter accumulation processes. Furthermore, in a sensitivity experiment with a constant 0.8 albedo over the whole ice sheet, the average amount of melt decreased by more than 60%, which highlights the importance of a correctly simulated surface albedo. The use of this coupled atmosphere-snow RCM offers new perspectives in the study of the Greenland surface mass balance due to the represented feedback between the surface climate and the surface albedo, which is the most sensitive parameter in energy-balance-based ablation calculations. |
author2 |
Institut d'Astronomie et de Géophysique Georges Lemaître (UCL-ASTR) Université Catholique de Louvain = Catholic University of Louvain (UCL) Flemish Institute for Technological Research (VITO) 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) Institute for Marine and Atmospheric Research Utrecht (IMAU) Utrecht University Utrecht Swiss Federal Research Station for Agroecology and Agriculture |
format |
Article in Journal/Newspaper |
author |
Lefebre, Filip Fettweis, Xavier Gallée, Hubert Van Ypersele, Jean-Pascal Marbaix, Philippe Greuell, Wouter Calanca, Pierluigi |
author_facet |
Lefebre, Filip Fettweis, Xavier Gallée, Hubert Van Ypersele, Jean-Pascal Marbaix, Philippe Greuell, Wouter Calanca, Pierluigi |
author_sort |
Lefebre, Filip |
title |
Evaluation of a high-resolution regional climate simulation over Greenland |
title_short |
Evaluation of a high-resolution regional climate simulation over Greenland |
title_full |
Evaluation of a high-resolution regional climate simulation over Greenland |
title_fullStr |
Evaluation of a high-resolution regional climate simulation over Greenland |
title_full_unstemmed |
Evaluation of a high-resolution regional climate simulation over Greenland |
title_sort |
evaluation of a high-resolution regional climate simulation over greenland |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal-insu.archives-ouvertes.fr/insu-00374621 https://doi.org/10.1007/s00382-005-0005-8 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal-insu.archives-ouvertes.fr/insu-00374621 Climate Dynamics, Springer Verlag, 2005, 25 (1), pp.99 à 116. ⟨10.1007/s00382-005-0005-8⟩ |
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op_doi |
https://doi.org/10.1007/s00382-005-0005-8 |
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Climate Dynamics |
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25 |
container_issue |
1 |
container_start_page |
99 |
op_container_end_page |
116 |
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1766016417695531008 |
spelling |
ftccsdartic:oai:HAL:insu-00374621v1 2023-05-15T16:27:17+02:00 Evaluation of a high-resolution regional climate simulation over Greenland Lefebre, Filip Fettweis, Xavier Gallée, Hubert Van Ypersele, Jean-Pascal Marbaix, Philippe Greuell, Wouter Calanca, Pierluigi Institut d'Astronomie et de Géophysique Georges Lemaître (UCL-ASTR) Université Catholique de Louvain = Catholic University of Louvain (UCL) Flemish Institute for Technological Research (VITO) 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) Institute for Marine and Atmospheric Research Utrecht (IMAU) Utrecht University Utrecht Swiss Federal Research Station for Agroecology and Agriculture 2005 https://hal-insu.archives-ouvertes.fr/insu-00374621 https://doi.org/10.1007/s00382-005-0005-8 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-005-0005-8 insu-00374621 https://hal-insu.archives-ouvertes.fr/insu-00374621 doi:10.1007/s00382-005-0005-8 ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal-insu.archives-ouvertes.fr/insu-00374621 Climate Dynamics, Springer Verlag, 2005, 25 (1), pp.99 à 116. ⟨10.1007/s00382-005-0005-8⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2005 ftccsdartic https://doi.org/10.1007/s00382-005-0005-8 2021-10-24T20:08:37Z International audience A simulation of the 1991 summer has been performed over south Greenland with a coupled atmosphere-snow regional climate model (RCM) forced by the ECMWF re-analysis. The simulation is evaluated with in-situ coastal and ice-sheet atmospheric and glaciological observations. Modelled air temperature, specific humidity, wind speed and radiative fluxes are in good agreement with the available observations, although uncertainties in the radiative transfer scheme need further investigation to improve the model's performance. In the sub-surface snow-ice model, surface albedo is calculated from the simulated snow grain shape and size, snow depth, meltwater accumulation, cloudiness and ice albedo. The use of snow metamorphism processes allows a realistic modelling of the temporal variations in the surface albedo during both melting periods and accumulation events. Concerning the surface albedo, the main finding is that an accurate albedo simulation during the melting season strongly depends on a proper initialization of the surface conditions which mainly result from winter accumulation processes. Furthermore, in a sensitivity experiment with a constant 0.8 albedo over the whole ice sheet, the average amount of melt decreased by more than 60%, which highlights the importance of a correctly simulated surface albedo. The use of this coupled atmosphere-snow RCM offers new perspectives in the study of the Greenland surface mass balance due to the represented feedback between the surface climate and the surface albedo, which is the most sensitive parameter in energy-balance-based ablation calculations. Article in Journal/Newspaper Greenland Ice Sheet Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Greenland Climate Dynamics 25 1 99 116 |