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...
Main Authors: | , , |
---|---|
Other Authors: | , , , , , , , |
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 |
id |
ftunivnantes:oai:HAL:hal-00329145v1 |
---|---|
record_format |
openpolar |
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 |
_version_ |
1766260932714954752 |