Atmospheric Circulations Induced by a Mid latitude SST Front: A GCM Study
International audience The atmospheric effects of sea surface temperature (SST) anomalies over and near western boundary currents are a matter of renewed interest. The general circulation model (GCM) of the Laboratoire de Meteorologie Dynamique (LMD-Z) has a zooming capability that allows a regional...
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ftepunivpsaclay:oai:HAL:hal-01111219v1 2024-06-09T07:48:13+00:00 Atmospheric Circulations Induced by a Mid latitude SST Front: A GCM Study Brachet, Sidonie Codron, Francis Feliks, Yizhak Ghil, Michael Le Treut, Hervé Simonnet, Eric Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) Department of Atmospheric and Oceanic Sciences Los Angeles (AOS) University of California Los Angeles (UCLA) University of California (UC)-University of California (UC) Institute of Geophysics and Planetary Physics Los Angeles (IGPP) Israel Inst Biol Res, Dept Math, Ness Ziona, Israel Institut Non Linéaire de Nice Sophia-Antipolis (INLN) Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UniCA) 2012 https://hal.science/hal-01111219 https://hal.science/hal-01111219/document https://hal.science/hal-01111219/file/Brachet2012.pdf https://doi.org/10.1175/JCLI-D-11-00329.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/JCLI-D-11-00329.1 hal-01111219 https://hal.science/hal-01111219 https://hal.science/hal-01111219/document https://hal.science/hal-01111219/file/Brachet2012.pdf doi:10.1175/JCLI-D-11-00329.1 info:eu-repo/semantics/OpenAccess ISSN: 0894-8755 EISSN: 1520-0442 Journal of Climate https://hal.science/hal-01111219 Journal of Climate, 2012, 25 (6), pp.1847-1853. ⟨10.1175/JCLI-D-11-00329.1⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2012 ftepunivpsaclay https://doi.org/10.1175/JCLI-D-11-00329.1 2024-05-16T12:40:51Z International audience The atmospheric effects of sea surface temperature (SST) anomalies over and near western boundary currents are a matter of renewed interest. The general circulation model (GCM) of the Laboratoire de Meteorologie Dynamique (LMD-Z) has a zooming capability that allows a regionally increased resolution. This GCM is used to analyze the impact of a sharp SST front in the North Atlantic Ocean: two simulations are compared, one with climatological SSTs and the other with an enhanced Gulf Stream front. The results corroborate the theory developed previously by the present team to explain the impact of oceanic fronts. In this theory, the vertical velocity at the top of the atmospheric boundary layer has two components: mechanical and thermal. It is the latter that is dominant in the tropics, while in midlatitudes both play a role in determining the wind convergence above the boundary layer. The strengthened SST front does generate the previously predicted stronger ascent above the warmer water south of the front and stronger descent above the colder waters to the north. In the GCM simulations, the ascent over the warm anomalies is deeper and more intense than the descent. Article in Journal/Newspaper North Atlantic École Polytechnique, Université Paris-Saclay: HAL Journal of Climate 25 6 1847 1853 |
institution |
Open Polar |
collection |
École Polytechnique, Université Paris-Saclay: HAL |
op_collection_id |
ftepunivpsaclay |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Brachet, Sidonie Codron, Francis Feliks, Yizhak Ghil, Michael Le Treut, Hervé Simonnet, Eric Atmospheric Circulations Induced by a Mid latitude SST Front: A GCM Study |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience The atmospheric effects of sea surface temperature (SST) anomalies over and near western boundary currents are a matter of renewed interest. The general circulation model (GCM) of the Laboratoire de Meteorologie Dynamique (LMD-Z) has a zooming capability that allows a regionally increased resolution. This GCM is used to analyze the impact of a sharp SST front in the North Atlantic Ocean: two simulations are compared, one with climatological SSTs and the other with an enhanced Gulf Stream front. The results corroborate the theory developed previously by the present team to explain the impact of oceanic fronts. In this theory, the vertical velocity at the top of the atmospheric boundary layer has two components: mechanical and thermal. It is the latter that is dominant in the tropics, while in midlatitudes both play a role in determining the wind convergence above the boundary layer. The strengthened SST front does generate the previously predicted stronger ascent above the warmer water south of the front and stronger descent above the colder waters to the north. In the GCM simulations, the ascent over the warm anomalies is deeper and more intense than the descent. |
author2 |
Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) Department of Atmospheric and Oceanic Sciences Los Angeles (AOS) University of California Los Angeles (UCLA) University of California (UC)-University of California (UC) Institute of Geophysics and Planetary Physics Los Angeles (IGPP) Israel Inst Biol Res, Dept Math, Ness Ziona, Israel Institut Non Linéaire de Nice Sophia-Antipolis (INLN) Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UniCA) |
format |
Article in Journal/Newspaper |
author |
Brachet, Sidonie Codron, Francis Feliks, Yizhak Ghil, Michael Le Treut, Hervé Simonnet, Eric |
author_facet |
Brachet, Sidonie Codron, Francis Feliks, Yizhak Ghil, Michael Le Treut, Hervé Simonnet, Eric |
author_sort |
Brachet, Sidonie |
title |
Atmospheric Circulations Induced by a Mid latitude SST Front: A GCM Study |
title_short |
Atmospheric Circulations Induced by a Mid latitude SST Front: A GCM Study |
title_full |
Atmospheric Circulations Induced by a Mid latitude SST Front: A GCM Study |
title_fullStr |
Atmospheric Circulations Induced by a Mid latitude SST Front: A GCM Study |
title_full_unstemmed |
Atmospheric Circulations Induced by a Mid latitude SST Front: A GCM Study |
title_sort |
atmospheric circulations induced by a mid latitude sst front: a gcm study |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.science/hal-01111219 https://hal.science/hal-01111219/document https://hal.science/hal-01111219/file/Brachet2012.pdf https://doi.org/10.1175/JCLI-D-11-00329.1 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0894-8755 EISSN: 1520-0442 Journal of Climate https://hal.science/hal-01111219 Journal of Climate, 2012, 25 (6), pp.1847-1853. ⟨10.1175/JCLI-D-11-00329.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/JCLI-D-11-00329.1 hal-01111219 https://hal.science/hal-01111219 https://hal.science/hal-01111219/document https://hal.science/hal-01111219/file/Brachet2012.pdf doi:10.1175/JCLI-D-11-00329.1 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/JCLI-D-11-00329.1 |
container_title |
Journal of Climate |
container_volume |
25 |
container_issue |
6 |
container_start_page |
1847 |
op_container_end_page |
1853 |
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1801379854575206400 |