Stationary Atmospheric Responses to an Idealized Sea Surface Temperature Anomaly in the Southern Ocean.
International audience The stationary atmospheric response to an idealized sea surface temperature anomaly (SSTA) is studied with a quasigeostrophic atmospheric model of the Southern Hemisphere. Sensitivity of the stationary response to the midlatitude SSTA location is determined and responses are d...
Published in: | Journal of Climate |
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Main Authors: | , , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2011
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Online Access: | https://hal.science/hal-00650199 https://hal.science/hal-00650199/document https://hal.science/hal-00650199/file/%5B15200442%20-%20Journal%20of%20Climate%5D%20Stationary%20Atmospheric%20Responses%20to%20an%20Idealized%20Sea%20Surface%20Temperature%20Anomaly%20in%20the%20Southern%20Ocean.pdf https://doi.org/10.1175/2011JCLI3737.1 |
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ftinsu:oai:HAL:hal-00650199v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Sea surface temperature Southern Ocean Atmosphere-ocean interaction Baroclinic flows Barotropic flows Quasigeostrophic models [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
Sea surface temperature Southern Ocean Atmosphere-ocean interaction Baroclinic flows Barotropic flows Quasigeostrophic models [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Maze, Guillaume d'Andrea, Fabio Colin de Verdiere, Alain Klein, Patrice Stationary Atmospheric Responses to an Idealized Sea Surface Temperature Anomaly in the Southern Ocean. |
topic_facet |
Sea surface temperature Southern Ocean Atmosphere-ocean interaction Baroclinic flows Barotropic flows Quasigeostrophic models [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience The stationary atmospheric response to an idealized sea surface temperature anomaly (SSTA) is studied with a quasigeostrophic atmospheric model of the Southern Hemisphere. Sensitivity of the stationary response to the midlatitude SSTA location is determined and responses are decomposed on vertical modes. The SSTA almost directly forces baroclinic responses, inducing warm-air anomalies 40°-50° downstream, eastward, to the SSTA. These baroclinic responses arise from an equilibrium between the SSTA-induced anomalous vortex stretching and (i) advection by the quasi-stationary flow and (ii) dissipation by high-frequency eddies. The barotropic response consists of a midlatitude ridge (trough) and a South Pole trough (ridge) for SSTAs localized from the Drake Passage to the western Indian Ocean (from south of Australia to the center of the Pacific Ocean). This response can be further decomposed into (i) a zonally asymmetric component, a quasi-stationary wave train forced by a barotropic ridge downstream of the SSTA; and (ii) a zonal-mean component similar to a meridional shift of westerlies and hence a southern annular mode (SAM)-like pattern. The former component is phase locked with the SSTA position, while the latter has a phase that depends on the relative SSTA position with regard to the background quasi-stationary wave pattern. The study shows that the barotropic downstream ridge response is responsible for modifying the low-frequency eddy-mean flow interactions through relative vorticity fluxes and inducing the bipolar projection of the zonal-mean response. |
author2 |
Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 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) |
format |
Article in Journal/Newspaper |
author |
Maze, Guillaume d'Andrea, Fabio Colin de Verdiere, Alain Klein, Patrice |
author_facet |
Maze, Guillaume d'Andrea, Fabio Colin de Verdiere, Alain Klein, Patrice |
author_sort |
Maze, Guillaume |
title |
Stationary Atmospheric Responses to an Idealized Sea Surface Temperature Anomaly in the Southern Ocean. |
title_short |
Stationary Atmospheric Responses to an Idealized Sea Surface Temperature Anomaly in the Southern Ocean. |
title_full |
Stationary Atmospheric Responses to an Idealized Sea Surface Temperature Anomaly in the Southern Ocean. |
title_fullStr |
Stationary Atmospheric Responses to an Idealized Sea Surface Temperature Anomaly in the Southern Ocean. |
title_full_unstemmed |
Stationary Atmospheric Responses to an Idealized Sea Surface Temperature Anomaly in the Southern Ocean. |
title_sort |
stationary atmospheric responses to an idealized sea surface temperature anomaly in the southern ocean. |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.science/hal-00650199 https://hal.science/hal-00650199/document https://hal.science/hal-00650199/file/%5B15200442%20-%20Journal%20of%20Climate%5D%20Stationary%20Atmospheric%20Responses%20to%20an%20Idealized%20Sea%20Surface%20Temperature%20Anomaly%20in%20the%20Southern%20Ocean.pdf https://doi.org/10.1175/2011JCLI3737.1 |
geographic |
Drake Passage Indian Pacific South Pole Southern Ocean |
geographic_facet |
Drake Passage Indian Pacific South Pole Southern Ocean |
genre |
Drake Passage South pole Southern Ocean |
genre_facet |
Drake Passage South pole Southern Ocean |
op_source |
ISSN: 0894-8755 EISSN: 1520-0442 Journal of Climate https://hal.science/hal-00650199 Journal of Climate, 2011, 24 (14), pp.3686-3704. ⟨10.1175/2011JCLI3737.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/2011JCLI3737.1 hal-00650199 https://hal.science/hal-00650199 https://hal.science/hal-00650199/document https://hal.science/hal-00650199/file/%5B15200442%20-%20Journal%20of%20Climate%5D%20Stationary%20Atmospheric%20Responses%20to%20an%20Idealized%20Sea%20Surface%20Temperature%20Anomaly%20in%20the%20Southern%20Ocean.pdf doi:10.1175/2011JCLI3737.1 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/2011JCLI3737.1 |
container_title |
Journal of Climate |
container_volume |
24 |
container_issue |
14 |
container_start_page |
3686 |
op_container_end_page |
3704 |
_version_ |
1785581883898200064 |
spelling |
ftinsu:oai:HAL:hal-00650199v1 2023-12-17T10:29:29+01:00 Stationary Atmospheric Responses to an Idealized Sea Surface Temperature Anomaly in the Southern Ocean. Maze, Guillaume d'Andrea, Fabio Colin de Verdiere, Alain Klein, Patrice Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 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) 2011-07 https://hal.science/hal-00650199 https://hal.science/hal-00650199/document https://hal.science/hal-00650199/file/%5B15200442%20-%20Journal%20of%20Climate%5D%20Stationary%20Atmospheric%20Responses%20to%20an%20Idealized%20Sea%20Surface%20Temperature%20Anomaly%20in%20the%20Southern%20Ocean.pdf https://doi.org/10.1175/2011JCLI3737.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/2011JCLI3737.1 hal-00650199 https://hal.science/hal-00650199 https://hal.science/hal-00650199/document https://hal.science/hal-00650199/file/%5B15200442%20-%20Journal%20of%20Climate%5D%20Stationary%20Atmospheric%20Responses%20to%20an%20Idealized%20Sea%20Surface%20Temperature%20Anomaly%20in%20the%20Southern%20Ocean.pdf doi:10.1175/2011JCLI3737.1 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0894-8755 EISSN: 1520-0442 Journal of Climate https://hal.science/hal-00650199 Journal of Climate, 2011, 24 (14), pp.3686-3704. ⟨10.1175/2011JCLI3737.1⟩ Sea surface temperature Southern Ocean Atmosphere-ocean interaction Baroclinic flows Barotropic flows Quasigeostrophic models [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2011 ftinsu https://doi.org/10.1175/2011JCLI3737.1 2023-11-22T17:34:17Z International audience The stationary atmospheric response to an idealized sea surface temperature anomaly (SSTA) is studied with a quasigeostrophic atmospheric model of the Southern Hemisphere. Sensitivity of the stationary response to the midlatitude SSTA location is determined and responses are decomposed on vertical modes. The SSTA almost directly forces baroclinic responses, inducing warm-air anomalies 40°-50° downstream, eastward, to the SSTA. These baroclinic responses arise from an equilibrium between the SSTA-induced anomalous vortex stretching and (i) advection by the quasi-stationary flow and (ii) dissipation by high-frequency eddies. The barotropic response consists of a midlatitude ridge (trough) and a South Pole trough (ridge) for SSTAs localized from the Drake Passage to the western Indian Ocean (from south of Australia to the center of the Pacific Ocean). This response can be further decomposed into (i) a zonally asymmetric component, a quasi-stationary wave train forced by a barotropic ridge downstream of the SSTA; and (ii) a zonal-mean component similar to a meridional shift of westerlies and hence a southern annular mode (SAM)-like pattern. The former component is phase locked with the SSTA position, while the latter has a phase that depends on the relative SSTA position with regard to the background quasi-stationary wave pattern. The study shows that the barotropic downstream ridge response is responsible for modifying the low-frequency eddy-mean flow interactions through relative vorticity fluxes and inducing the bipolar projection of the zonal-mean response. Article in Journal/Newspaper Drake Passage South pole Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Drake Passage Indian Pacific South Pole Southern Ocean Journal of Climate 24 14 3686 3704 |