The storm tracks and the energy cycle of the Southern Hemisphere: sensitivity to sea-ice boundary conditions
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 remo...
Published in: | Annales Geophysicae |
---|---|
Main Authors: | , , |
Format: | Text |
Language: | English |
Published: |
2018
|
Subjects: | |
Online Access: | https://doi.org/10.1007/s00585-999-1478-2 https://angeo.copernicus.org/articles/17/1478/1999/ |
id |
ftcopernicus:oai:publications.copernicus.org:angeo34505 |
---|---|
record_format |
openpolar |
spelling |
ftcopernicus:oai:publications.copernicus.org:angeo34505 2023-05-15T13:36:36+02:00 The storm tracks and the energy cycle of the Southern Hemisphere: sensitivity to sea-ice boundary conditions Menéndez, C. G. Serafini, V. Treut, H. 2018-09-27 application/pdf https://doi.org/10.1007/s00585-999-1478-2 https://angeo.copernicus.org/articles/17/1478/1999/ eng eng doi:10.1007/s00585-999-1478-2 https://angeo.copernicus.org/articles/17/1478/1999/ eISSN: 1432-0576 Text 2018 ftcopernicus https://doi.org/10.1007/s00585-999-1478-2 2020-07-20T16:28:00Z 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. Key words. Air-sea interactions · Meteorology and atmospheric dynamics (climatology; ocean · atmosphere interactions) Text Antarc* Antarctic Sea ice Southern Ocean Copernicus Publications: E-Journals Antarctic Indian Pacific Southern Ocean The Antarctic Annales Geophysicae 17 11 1478 1492 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
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. Key words. Air-sea interactions · Meteorology and atmospheric dynamics (climatology; ocean · atmosphere interactions) |
format |
Text |
author |
Menéndez, C. G. Serafini, V. Treut, H. |
spellingShingle |
Menéndez, C. G. Serafini, V. Treut, H. The storm tracks and the energy cycle of the Southern Hemisphere: sensitivity to sea-ice boundary conditions |
author_facet |
Menéndez, C. G. Serafini, V. Treut, H. |
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 |
publishDate |
2018 |
url |
https://doi.org/10.1007/s00585-999-1478-2 https://angeo.copernicus.org/articles/17/1478/1999/ |
geographic |
Antarctic Indian Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Indian Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_source |
eISSN: 1432-0576 |
op_relation |
doi:10.1007/s00585-999-1478-2 https://angeo.copernicus.org/articles/17/1478/1999/ |
op_doi |
https://doi.org/10.1007/s00585-999-1478-2 |
container_title |
Annales Geophysicae |
container_volume |
17 |
container_issue |
11 |
container_start_page |
1478 |
op_container_end_page |
1492 |
_version_ |
1766081637298208768 |