The influence of orography on modern ocean circulation
International audience The effects of orography on climate are investigated with a coupled ocean-atmosphere general circulation model (IPSL-CM5). Results are compared with previous investigations in order to dig out robust consequences of the lack of orography on the global scale. Emphasis is made o...
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Online Access: | https://hal.archives-ouvertes.fr/hal-01765565 https://doi.org/10.1007/s00382-017-3683-0 |
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ftccsdartic:oai:HAL:hal-01765565v1 2023-05-15T17:34:41+02:00 The influence of orography on modern ocean circulation Maffre, Pierre Ladant, Jean-Baptiste Donnadieu, Yannick Sepulchre, Pierre Godderis, Yves Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Modélisation du climat (CLIM) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) 2018 https://hal.archives-ouvertes.fr/hal-01765565 https://doi.org/10.1007/s00382-017-3683-0 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-017-3683-0 hal-01765565 https://hal.archives-ouvertes.fr/hal-01765565 doi:10.1007/s00382-017-3683-0 ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.archives-ouvertes.fr/hal-01765565 Climate Dynamics, Springer Verlag, 2018, 50 (3-4), pp.1277-1289. ⟨10.1007/s00382-017-3683-0⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2018 ftccsdartic https://doi.org/10.1007/s00382-017-3683-0 2021-12-26T00:01:53Z International audience The effects of orography on climate are investigated with a coupled ocean-atmosphere general circulation model (IPSL-CM5). Results are compared with previous investigations in order to dig out robust consequences of the lack of orography on the global scale. Emphasis is made on the thermohaline circulation whose sensitivity to orography has only been subject to a very limited number of studies using coupled models. The removal of the entire orography switches the Meridional Overturning Circulation from the Atlantic to the Pacific, following freshwater transfers from the latter to the former that reverse the salinity gradient between these oceans. This is in part due to the increased freshwater export from the Pacific to the Atlantic through North America in the absence of the Rocky Mountains and the consecutive decreased evaporation in the North Atlantic once the Atlantic MOC weakens, which cools the northern high-latitudes. In addition and unlike previous model studies, we find that tropical freshwater transfers are a major driver of this switch. More precisely, the collapse of the Asian summer monsoon, associated with westward freshwater transfer across Africa, is critical to the freshening of the Atlantic and the increased salt content in the Pacific. Specifically, precipitations are increasing over the Congo catchment area and induce a strong increase in runoff discharging into the tropical Atlantic. In addition, the removal of the Andes shifts the area of strong precipitation toward the Amazonian catchment area and results in a larger runoff discharging into the Tropical Atlantic. Article in Journal/Newspaper North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Pacific Climate Dynamics 50 3-4 1277 1289 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Maffre, Pierre Ladant, Jean-Baptiste Donnadieu, Yannick Sepulchre, Pierre Godderis, Yves The influence of orography on modern ocean circulation |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The effects of orography on climate are investigated with a coupled ocean-atmosphere general circulation model (IPSL-CM5). Results are compared with previous investigations in order to dig out robust consequences of the lack of orography on the global scale. Emphasis is made on the thermohaline circulation whose sensitivity to orography has only been subject to a very limited number of studies using coupled models. The removal of the entire orography switches the Meridional Overturning Circulation from the Atlantic to the Pacific, following freshwater transfers from the latter to the former that reverse the salinity gradient between these oceans. This is in part due to the increased freshwater export from the Pacific to the Atlantic through North America in the absence of the Rocky Mountains and the consecutive decreased evaporation in the North Atlantic once the Atlantic MOC weakens, which cools the northern high-latitudes. In addition and unlike previous model studies, we find that tropical freshwater transfers are a major driver of this switch. More precisely, the collapse of the Asian summer monsoon, associated with westward freshwater transfer across Africa, is critical to the freshening of the Atlantic and the increased salt content in the Pacific. Specifically, precipitations are increasing over the Congo catchment area and induce a strong increase in runoff discharging into the tropical Atlantic. In addition, the removal of the Andes shifts the area of strong precipitation toward the Amazonian catchment area and results in a larger runoff discharging into the Tropical Atlantic. |
author2 |
Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Modélisation du climat (CLIM) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) |
format |
Article in Journal/Newspaper |
author |
Maffre, Pierre Ladant, Jean-Baptiste Donnadieu, Yannick Sepulchre, Pierre Godderis, Yves |
author_facet |
Maffre, Pierre Ladant, Jean-Baptiste Donnadieu, Yannick Sepulchre, Pierre Godderis, Yves |
author_sort |
Maffre, Pierre |
title |
The influence of orography on modern ocean circulation |
title_short |
The influence of orography on modern ocean circulation |
title_full |
The influence of orography on modern ocean circulation |
title_fullStr |
The influence of orography on modern ocean circulation |
title_full_unstemmed |
The influence of orography on modern ocean circulation |
title_sort |
influence of orography on modern ocean circulation |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.archives-ouvertes.fr/hal-01765565 https://doi.org/10.1007/s00382-017-3683-0 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.archives-ouvertes.fr/hal-01765565 Climate Dynamics, Springer Verlag, 2018, 50 (3-4), pp.1277-1289. ⟨10.1007/s00382-017-3683-0⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-017-3683-0 hal-01765565 https://hal.archives-ouvertes.fr/hal-01765565 doi:10.1007/s00382-017-3683-0 |
op_doi |
https://doi.org/10.1007/s00382-017-3683-0 |
container_title |
Climate Dynamics |
container_volume |
50 |
container_issue |
3-4 |
container_start_page |
1277 |
op_container_end_page |
1289 |
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1766133602440970240 |