The storm tracks and the energy cycle of the Southern Hemisphere: sensitivity to sea-ice boundary conditions

International audience The effect of sea-ice on various aspects of the Southern Hemisphere (SH) extratropical climate is examined. Two simulations using the LMD GCM are performed: a control run with the observed sea-ice distribution and an anomaly run in which all SH sea-ice is replaced by open ocea...

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Main Authors: Menéndez, C. G., Serafini, V., Le Treut, Hervé
Other Authors: Centro de Investigaciones del Mar y la Atmósfera (CIMA), Consejo Nacional de Investigaciones Científicas y Técnicas Buenos Aires (CONICET)-Facultad de Ciencias Exactas y Naturales Buenos Aires (FCEyN), Universidad de Buenos Aires Buenos Aires (UBA)-Universidad de Buenos Aires Buenos Aires (UBA), 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
Language:English
Published: HAL CCSD 1999
Subjects:
Online Access:https://hal.science/hal-00329145
https://hal.science/hal-00329145/document
https://hal.science/hal-00329145/file/angeo-17-1478-1999.pdf
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spelling ftunivnantes:oai:HAL:hal-00329145v1 2023-05-15T13:54:48+02:00 The storm tracks and the energy cycle of the Southern Hemisphere: sensitivity to sea-ice boundary conditions Menéndez, C. G. Serafini, V. Le Treut, Hervé Centro de Investigaciones del Mar y la Atmósfera (CIMA) Consejo Nacional de Investigaciones Científicas y Técnicas Buenos Aires (CONICET)-Facultad de Ciencias Exactas y Naturales Buenos Aires (FCEyN) Universidad de Buenos Aires Buenos Aires (UBA)-Universidad de Buenos Aires Buenos Aires (UBA) 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) 1999 https://hal.science/hal-00329145 https://hal.science/hal-00329145/document https://hal.science/hal-00329145/file/angeo-17-1478-1999.pdf en eng HAL CCSD European Geosciences Union hal-00329145 https://hal.science/hal-00329145 https://hal.science/hal-00329145/document https://hal.science/hal-00329145/file/angeo-17-1478-1999.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00329145 Annales Geophysicae, 1999, 17 (11), pp.1478-1492 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 1999 ftunivnantes 2023-02-08T04:19:58Z International audience The effect of sea-ice on various aspects of the Southern Hemisphere (SH) extratropical climate is examined. Two simulations using the LMD GCM are performed: a control run with the observed sea-ice distribution and an anomaly run in which all SH sea-ice is replaced by open ocean. When sea-ice is removed, the mean sea level pressure displays anomalies predominantly negatives near the Antarctic coast. In general, the meridional temperature gradient is reduced over most of the Southern Ocean, the polar jet is weaker and the sea level pressure rises equatorward of the control ice edge. The high frequency filtered standard deviation of both the sea level pressure and the 300-hPa geopotential height decreases over the southern Pacific and southwestern Atlantic oceans, especially to the north of the ice edge (as prescribed in the control). In contrast, over the Indian Ocean the perturbed simulation exhibits less variability equatorward of about 50°S and increased variability to the south. The zonal averages of the zonal and eddy potential and kinetic energies were evaluated. The effect of removing sea-ice is to diminish the available potential energy of the mean zonal flow, the available potential energy of the perturbations, the kinetic energy of the growing disturbances and the kinetic energy of the mean zonal flow over most of the Southern Ocean. The zonally averaged intensity of the subpolar trough and the rate of the baroclinic energy conversions are also weaker. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean Université de Nantes: HAL-UNIV-NANTES Antarctic Southern Ocean The Antarctic Pacific Indian
institution Open Polar
collection Université de Nantes: HAL-UNIV-NANTES
op_collection_id ftunivnantes
language English
topic [SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
spellingShingle [SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
Menéndez, C. G.
Serafini, V.
Le Treut, Hervé
The storm tracks and the energy cycle of the Southern Hemisphere: sensitivity to sea-ice boundary conditions
topic_facet [SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
description International audience The effect of sea-ice on various aspects of the Southern Hemisphere (SH) extratropical climate is examined. Two simulations using the LMD GCM are performed: a control run with the observed sea-ice distribution and an anomaly run in which all SH sea-ice is replaced by open ocean. When sea-ice is removed, the mean sea level pressure displays anomalies predominantly negatives near the Antarctic coast. In general, the meridional temperature gradient is reduced over most of the Southern Ocean, the polar jet is weaker and the sea level pressure rises equatorward of the control ice edge. The high frequency filtered standard deviation of both the sea level pressure and the 300-hPa geopotential height decreases over the southern Pacific and southwestern Atlantic oceans, especially to the north of the ice edge (as prescribed in the control). In contrast, over the Indian Ocean the perturbed simulation exhibits less variability equatorward of about 50°S and increased variability to the south. The zonal averages of the zonal and eddy potential and kinetic energies were evaluated. The effect of removing sea-ice is to diminish the available potential energy of the mean zonal flow, the available potential energy of the perturbations, the kinetic energy of the growing disturbances and the kinetic energy of the mean zonal flow over most of the Southern Ocean. The zonally averaged intensity of the subpolar trough and the rate of the baroclinic energy conversions are also weaker.
author2 Centro de Investigaciones del Mar y la Atmósfera (CIMA)
Consejo Nacional de Investigaciones Científicas y Técnicas Buenos Aires (CONICET)-Facultad de Ciencias Exactas y Naturales Buenos Aires (FCEyN)
Universidad de Buenos Aires Buenos Aires (UBA)-Universidad de Buenos Aires Buenos Aires (UBA)
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 Menéndez, C. G.
Serafini, V.
Le Treut, Hervé
author_facet Menéndez, C. G.
Serafini, V.
Le Treut, Hervé
author_sort Menéndez, C. G.
title The storm tracks and the energy cycle of the Southern Hemisphere: sensitivity to sea-ice boundary conditions
title_short The storm tracks and the energy cycle of the Southern Hemisphere: sensitivity to sea-ice boundary conditions
title_full The storm tracks and the energy cycle of the Southern Hemisphere: sensitivity to sea-ice boundary conditions
title_fullStr The storm tracks and the energy cycle of the Southern Hemisphere: sensitivity to sea-ice boundary conditions
title_full_unstemmed The storm tracks and the energy cycle of the Southern Hemisphere: sensitivity to sea-ice boundary conditions
title_sort storm tracks and the energy cycle of the southern hemisphere: sensitivity to sea-ice boundary conditions
publisher HAL CCSD
publishDate 1999
url https://hal.science/hal-00329145
https://hal.science/hal-00329145/document
https://hal.science/hal-00329145/file/angeo-17-1478-1999.pdf
geographic Antarctic
Southern Ocean
The Antarctic
Pacific
Indian
geographic_facet Antarctic
Southern Ocean
The Antarctic
Pacific
Indian
genre Antarc*
Antarctic
Sea ice
Southern Ocean
genre_facet Antarc*
Antarctic
Sea ice
Southern Ocean
op_source ISSN: 0992-7689
EISSN: 1432-0576
Annales Geophysicae
https://hal.science/hal-00329145
Annales Geophysicae, 1999, 17 (11), pp.1478-1492
op_relation hal-00329145
https://hal.science/hal-00329145
https://hal.science/hal-00329145/document
https://hal.science/hal-00329145/file/angeo-17-1478-1999.pdf
op_rights info:eu-repo/semantics/OpenAccess
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