Dynamics of sea-surface temperature anomalies in the Southern Ocean diagnosed from a 2D mixed-layer model

International audience We analyze the processes responsible for the generation and evolution of sea-surface temperature anomalies observed in the Southern Ocean during a decade based on a 2D diagnostic mixed-layer model in which geostrophic advection is prescribed from altimetry. Anomalous air-sea h...

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Published in:Climate Dynamics
Main Authors: Vivier, Frédéric, Iudicone, Daniele, Busdraghi, Fabiano, Park, Young-Hyang
Other Authors: 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)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2010
Subjects:
SAM
Online Access:https://hal.science/hal-00763279
https://doi.org/10.1007/S00382-009-0724-3
id ftinsu:oai:HAL:hal-00763279v1
record_format openpolar
institution Open Polar
collection Institut national des sciences de l'Univers: HAL-INSU
op_collection_id ftinsu
language English
topic Southern Ocean
SST anomalies
Mixed layer
Heat budget
ENSO
SAM
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]
spellingShingle Southern Ocean
SST anomalies
Mixed layer
Heat budget
ENSO
SAM
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]
Vivier, Frédéric
Iudicone, Daniele
Busdraghi, Fabiano
Park, Young-Hyang
Dynamics of sea-surface temperature anomalies in the Southern Ocean diagnosed from a 2D mixed-layer model
topic_facet Southern Ocean
SST anomalies
Mixed layer
Heat budget
ENSO
SAM
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]
description International audience We analyze the processes responsible for the generation and evolution of sea-surface temperature anomalies observed in the Southern Ocean during a decade based on a 2D diagnostic mixed-layer model in which geostrophic advection is prescribed from altimetry. Anomalous air-sea heat flux is the dominant term of the heat budget over most of the domain, while anomalous Ekman heat fluxes account for 20-40% of the variance in the latitude band 40°-60°S. In the ACC pathway, lateral fluxes of heat associated with anomalous geostrophic currents are a major contributor, dominating downstream of several topographic features, reflecting the influence of eddies and frontal migrations. A significant fraction of the variability of large-scale SST anomalies is correlated with either ENSO or the SAM, each mode contributing roughly equally. The relation between the heat budget terms and these climate modes is investigated, showing in particular that anomalous Ekman and air-sea heat fluxes have a co-operating effect (with regional exceptions), hence the large SST response associated with each mode. It is further shown that ENSO- or SAM-locked anomalous geostrophic currents generate substantial heat fluxes in all three basins with magnitude comparable with that of atmospheric forcings for ENSO, and smaller for the SAM except for limited areas. ENSO-locked forcings generate SST anomalies along the ACC pathway, and advection by mean flows is found to be a non-negligible contribution to the heat budget, exhibiting a wavenumber two zonal structure, characteristic of the Antarctic Circumpolar Wave. By contrast SAM-related forcings are predominantly zonally uniform along the ACC, hence smaller zonal SST gradients and a lesser role of mean advection, except in the SouthWest Atlantic. While modeled SST anomalies are significantly correlated with observations over most of the Southern Ocean, the analysis of the data-model discrepancies suggests that vertical ocean physics may play a significant role in the ...
author2 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)
format Article in Journal/Newspaper
author Vivier, Frédéric
Iudicone, Daniele
Busdraghi, Fabiano
Park, Young-Hyang
author_facet Vivier, Frédéric
Iudicone, Daniele
Busdraghi, Fabiano
Park, Young-Hyang
author_sort Vivier, Frédéric
title Dynamics of sea-surface temperature anomalies in the Southern Ocean diagnosed from a 2D mixed-layer model
title_short Dynamics of sea-surface temperature anomalies in the Southern Ocean diagnosed from a 2D mixed-layer model
title_full Dynamics of sea-surface temperature anomalies in the Southern Ocean diagnosed from a 2D mixed-layer model
title_fullStr Dynamics of sea-surface temperature anomalies in the Southern Ocean diagnosed from a 2D mixed-layer model
title_full_unstemmed Dynamics of sea-surface temperature anomalies in the Southern Ocean diagnosed from a 2D mixed-layer model
title_sort dynamics of sea-surface temperature anomalies in the southern ocean diagnosed from a 2d mixed-layer model
publisher HAL CCSD
publishDate 2010
url https://hal.science/hal-00763279
https://doi.org/10.1007/S00382-009-0724-3
genre Antarc*
Antarctic
Southern Ocean
genre_facet Antarc*
Antarctic
Southern Ocean
op_source ISSN: 0930-7575
EISSN: 1432-0894
Climate Dynamics
https://hal.science/hal-00763279
Climate Dynamics, 2010, 34 (2-3), pp.153-184. ⟨10.1007/S00382-009-0724-3⟩
op_relation info:eu-repo/semantics/altIdentifier/doi/10.1007/S00382-009-0724-3
hal-00763279
https://hal.science/hal-00763279
BIBCODE: 2010ClDy.34.153V
doi:10.1007/S00382-009-0724-3
op_doi https://doi.org/10.1007/S00382-009-0724-3
container_title Climate Dynamics
container_volume 34
container_issue 2-3
container_start_page 153
op_container_end_page 184
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spelling ftinsu:oai:HAL:hal-00763279v1 2024-04-28T07:56:39+00:00 Dynamics of sea-surface temperature anomalies in the Southern Ocean diagnosed from a 2D mixed-layer model Vivier, Frédéric Iudicone, Daniele Busdraghi, Fabiano Park, Young-Hyang 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) 2010-02 https://hal.science/hal-00763279 https://doi.org/10.1007/S00382-009-0724-3 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/S00382-009-0724-3 hal-00763279 https://hal.science/hal-00763279 BIBCODE: 2010ClDy.34.153V doi:10.1007/S00382-009-0724-3 ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.science/hal-00763279 Climate Dynamics, 2010, 34 (2-3), pp.153-184. ⟨10.1007/S00382-009-0724-3⟩ Southern Ocean SST anomalies Mixed layer Heat budget ENSO SAM [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2010 ftinsu https://doi.org/10.1007/S00382-009-0724-3 2024-04-05T00:21:12Z International audience We analyze the processes responsible for the generation and evolution of sea-surface temperature anomalies observed in the Southern Ocean during a decade based on a 2D diagnostic mixed-layer model in which geostrophic advection is prescribed from altimetry. Anomalous air-sea heat flux is the dominant term of the heat budget over most of the domain, while anomalous Ekman heat fluxes account for 20-40% of the variance in the latitude band 40°-60°S. In the ACC pathway, lateral fluxes of heat associated with anomalous geostrophic currents are a major contributor, dominating downstream of several topographic features, reflecting the influence of eddies and frontal migrations. A significant fraction of the variability of large-scale SST anomalies is correlated with either ENSO or the SAM, each mode contributing roughly equally. The relation between the heat budget terms and these climate modes is investigated, showing in particular that anomalous Ekman and air-sea heat fluxes have a co-operating effect (with regional exceptions), hence the large SST response associated with each mode. It is further shown that ENSO- or SAM-locked anomalous geostrophic currents generate substantial heat fluxes in all three basins with magnitude comparable with that of atmospheric forcings for ENSO, and smaller for the SAM except for limited areas. ENSO-locked forcings generate SST anomalies along the ACC pathway, and advection by mean flows is found to be a non-negligible contribution to the heat budget, exhibiting a wavenumber two zonal structure, characteristic of the Antarctic Circumpolar Wave. By contrast SAM-related forcings are predominantly zonally uniform along the ACC, hence smaller zonal SST gradients and a lesser role of mean advection, except in the SouthWest Atlantic. While modeled SST anomalies are significantly correlated with observations over most of the Southern Ocean, the analysis of the data-model discrepancies suggests that vertical ocean physics may play a significant role in the ... Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Climate Dynamics 34 2-3 153 184