Subtropical dipole modes simulated in a coupled general circulation model
International audience The growth and decay mechanisms of subtropical dipole modes in the southern Indian and South Atlantic Oceans and their impacts on southern African rainfall are investigated using results from a coupled general circulation model originally developed for predicting tropical clim...
Published in: | Journal of Climate |
---|---|
Main Authors: | , , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2012
|
Subjects: | |
Online Access: | https://hal.science/hal-00758345 https://hal.science/hal-00758345/document https://hal.science/hal-00758345/file/%5B15200442%20-%20Journal%20of%20Climate%5D%20Subtropical%20Dipole%20Modes%20Simulated%20in%20a%20Coupled%20General%20Circulation%20Model.pdf https://doi.org/10.1175/JCLI-D-11-00396.1 |
id |
ftinsu:oai:HAL:hal-00758345v1 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Atmosphere-ocean interaction Oceanic mixed layer Precipitation Sea surface temperature Interannual variability Seasonal variability [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
Atmosphere-ocean interaction Oceanic mixed layer Precipitation Sea surface temperature Interannual variability Seasonal variability [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes Morioka, Yushi Tozuka, Tomoki Masson, Sébastien Terray, Pascal Luo, Jing-Jia Yamagata, Toshio Subtropical dipole modes simulated in a coupled general circulation model |
topic_facet |
Atmosphere-ocean interaction Oceanic mixed layer Precipitation Sea surface temperature Interannual variability Seasonal variability [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience The growth and decay mechanisms of subtropical dipole modes in the southern Indian and South Atlantic Oceans and their impacts on southern African rainfall are investigated using results from a coupled general circulation model originally developed for predicting tropical climate variations. The second (most) dominant mode of interannual sea surface temperature (SST) variations in the southern Indian (South Atlantic) Ocean represents a northeast–southwest oriented dipole, now called subtropical dipole mode. The positive (negative) SST interannual anomaly pole starts to grow in austral spring and reaches its peak in February. In austral late spring, the suppressed (enhanced) latent heat flux loss associated with the variations in the subtropical high causes a thinner (thicker) than normal mixed layer thickness that, in turn, enhances (reduces) the warming of the mixed layer by the climatological shortwave radiation. The positive (negative) pole gradually decays in austral fall because the mixed layer cooling by the entrainment is enhanced (reduced), mostly owing to the larger (smaller) temperature difference between the mixed layer and the entrained water. The increased (decreased) latent heat loss due to the warmer (colder) SST also contributes to the decay of the positive (negative) pole. Although further verification using longer observational data is required, the present coupled model suggests that the South Atlantic subtropical dipole may play a more important role in rainfall variations over the southern African region than the Indian Ocean subtropical dipole. |
author2 |
Department of Earth and Planetary Science Tokyo Graduate School of Science Tokyo The University of Tokyo (UTokyo)-The University of Tokyo (UTokyo) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Variabilité climatique tropicale et globale (VARCLIM) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Research Institute for Global Change (RIGC) Japan Agency for Marine-Earth Science and Technology (JAMSTEC) |
format |
Article in Journal/Newspaper |
author |
Morioka, Yushi Tozuka, Tomoki Masson, Sébastien Terray, Pascal Luo, Jing-Jia Yamagata, Toshio |
author_facet |
Morioka, Yushi Tozuka, Tomoki Masson, Sébastien Terray, Pascal Luo, Jing-Jia Yamagata, Toshio |
author_sort |
Morioka, Yushi |
title |
Subtropical dipole modes simulated in a coupled general circulation model |
title_short |
Subtropical dipole modes simulated in a coupled general circulation model |
title_full |
Subtropical dipole modes simulated in a coupled general circulation model |
title_fullStr |
Subtropical dipole modes simulated in a coupled general circulation model |
title_full_unstemmed |
Subtropical dipole modes simulated in a coupled general circulation model |
title_sort |
subtropical dipole modes simulated in a coupled general circulation model |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.science/hal-00758345 https://hal.science/hal-00758345/document https://hal.science/hal-00758345/file/%5B15200442%20-%20Journal%20of%20Climate%5D%20Subtropical%20Dipole%20Modes%20Simulated%20in%20a%20Coupled%20General%20Circulation%20Model.pdf https://doi.org/10.1175/JCLI-D-11-00396.1 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
ISSN: 0894-8755 EISSN: 1520-0442 Journal of Climate https://hal.science/hal-00758345 Journal of Climate, 2012, 25, pp.4029-4047. ⟨10.1175/JCLI-D-11-00396.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/JCLI-D-11-00396.1 hal-00758345 https://hal.science/hal-00758345 https://hal.science/hal-00758345/document https://hal.science/hal-00758345/file/%5B15200442%20-%20Journal%20of%20Climate%5D%20Subtropical%20Dipole%20Modes%20Simulated%20in%20a%20Coupled%20General%20Circulation%20Model.pdf BIBCODE: 2012JCli.25.4029M doi:10.1175/JCLI-D-11-00396.1 IRD: fdi:010057045 WOS: 000306043600004 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/JCLI-D-11-00396.1 |
container_title |
Journal of Climate |
container_volume |
25 |
container_issue |
12 |
container_start_page |
4029 |
op_container_end_page |
4047 |
_version_ |
1797569488764272640 |
spelling |
ftinsu:oai:HAL:hal-00758345v1 2024-04-28T08:38:16+00:00 Subtropical dipole modes simulated in a coupled general circulation model Morioka, Yushi Tozuka, Tomoki Masson, Sébastien Terray, Pascal Luo, Jing-Jia Yamagata, Toshio Department of Earth and Planetary Science Tokyo Graduate School of Science Tokyo The University of Tokyo (UTokyo)-The University of Tokyo (UTokyo) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Variabilité climatique tropicale et globale (VARCLIM) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Research Institute for Global Change (RIGC) Japan Agency for Marine-Earth Science and Technology (JAMSTEC) 2012-06 https://hal.science/hal-00758345 https://hal.science/hal-00758345/document https://hal.science/hal-00758345/file/%5B15200442%20-%20Journal%20of%20Climate%5D%20Subtropical%20Dipole%20Modes%20Simulated%20in%20a%20Coupled%20General%20Circulation%20Model.pdf https://doi.org/10.1175/JCLI-D-11-00396.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/JCLI-D-11-00396.1 hal-00758345 https://hal.science/hal-00758345 https://hal.science/hal-00758345/document https://hal.science/hal-00758345/file/%5B15200442%20-%20Journal%20of%20Climate%5D%20Subtropical%20Dipole%20Modes%20Simulated%20in%20a%20Coupled%20General%20Circulation%20Model.pdf BIBCODE: 2012JCli.25.4029M doi:10.1175/JCLI-D-11-00396.1 IRD: fdi:010057045 WOS: 000306043600004 info:eu-repo/semantics/OpenAccess ISSN: 0894-8755 EISSN: 1520-0442 Journal of Climate https://hal.science/hal-00758345 Journal of Climate, 2012, 25, pp.4029-4047. ⟨10.1175/JCLI-D-11-00396.1⟩ Atmosphere-ocean interaction Oceanic mixed layer Precipitation Sea surface temperature Interannual variability Seasonal variability [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2012 ftinsu https://doi.org/10.1175/JCLI-D-11-00396.1 2024-04-05T00:36:09Z International audience The growth and decay mechanisms of subtropical dipole modes in the southern Indian and South Atlantic Oceans and their impacts on southern African rainfall are investigated using results from a coupled general circulation model originally developed for predicting tropical climate variations. The second (most) dominant mode of interannual sea surface temperature (SST) variations in the southern Indian (South Atlantic) Ocean represents a northeast–southwest oriented dipole, now called subtropical dipole mode. The positive (negative) SST interannual anomaly pole starts to grow in austral spring and reaches its peak in February. In austral late spring, the suppressed (enhanced) latent heat flux loss associated with the variations in the subtropical high causes a thinner (thicker) than normal mixed layer thickness that, in turn, enhances (reduces) the warming of the mixed layer by the climatological shortwave radiation. The positive (negative) pole gradually decays in austral fall because the mixed layer cooling by the entrainment is enhanced (reduced), mostly owing to the larger (smaller) temperature difference between the mixed layer and the entrained water. The increased (decreased) latent heat loss due to the warmer (colder) SST also contributes to the decay of the positive (negative) pole. Although further verification using longer observational data is required, the present coupled model suggests that the South Atlantic subtropical dipole may play a more important role in rainfall variations over the southern African region than the Indian Ocean subtropical dipole. Article in Journal/Newspaper South Atlantic Ocean Institut national des sciences de l'Univers: HAL-INSU Journal of Climate 25 12 4029 4047 |