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...
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_09927689_v17_n11_p1478_Menendez |
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todo:paper_09927689_v17_n11_p1478_Menendez2023-10-03T15:55:41Z The storm tracks and the energy cycle of the Southern Hemisphere: Sensitivity to sea-ice boundary conditions Menéndez, C.G. Serafini, V. Le Treut, H. Air-sea interactions Meteorology and atmospheric dynamics (climatology; ocean-atmosphere interactions) 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09927689_v17_n11_p1478_Menendez |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Air-sea interactions Meteorology and atmospheric dynamics (climatology; ocean-atmosphere interactions) |
| spellingShingle |
Air-sea interactions Meteorology and atmospheric dynamics (climatology; ocean-atmosphere interactions) Menéndez, C.G. Serafini, V. Le Treut, H. The storm tracks and the energy cycle of the Southern Hemisphere: Sensitivity to sea-ice boundary conditions |
| topic_facet |
Air-sea interactions Meteorology and atmospheric dynamics (climatology; ocean-atmosphere interactions) |
| 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. |
| format |
JOUR |
| author |
Menéndez, C.G. Serafini, V. Le Treut, H. |
| author_facet |
Menéndez, C.G. Serafini, V. Le 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_09927689_v17_n11_p1478_Menendez |
| work_keys_str_mv |
AT menendezcg thestormtracksandtheenergycycleofthesouthernhemispheresensitivitytoseaiceboundaryconditions AT serafiniv thestormtracksandtheenergycycleofthesouthernhemispheresensitivitytoseaiceboundaryconditions AT letreuth thestormtracksandtheenergycycleofthesouthernhemispheresensitivitytoseaiceboundaryconditions AT menendezcg stormtracksandtheenergycycleofthesouthernhemispheresensitivitytoseaiceboundaryconditions AT serafiniv stormtracksandtheenergycycleofthesouthernhemispheresensitivitytoseaiceboundaryconditions AT letreuth stormtracksandtheenergycycleofthesouthernhemispheresensitivitytoseaiceboundaryconditions |
| _version_ |
1782028531200425984 |