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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ftinsu:oai:HAL:hal-01765565v1 2024-04-28T08:31:07+00:00 The influence of orography on modern ocean circulation Maffre, Pierre Ladant, Jean-Baptiste Donnadieu, Yannick Sepulchre, Pierre Godderis, Yves Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) 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)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Modélisation du climat (CLIM) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) 2018 https://hal.science/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.science/hal-01765565 doi:10.1007/s00382-017-3683-0 ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.science/hal-01765565 Climate Dynamics, 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 ftinsu https://doi.org/10.1007/s00382-017-3683-0 2024-04-05T00:46:12Z 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 Institut national des sciences de l'Univers: HAL-INSU Climate Dynamics 50 3-4 1277 1289 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
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 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) 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)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Modélisation du climat (CLIM) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) |
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.science/hal-01765565 https://doi.org/10.1007/s00382-017-3683-0 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.science/hal-01765565 Climate Dynamics, 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.science/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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1797588746769530880 |