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Abstract:

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.

Registro:

Documento: Artículo
Título:The storm tracks and the energy cycle of the Southern Hemisphere: Sensitivity to sea-ice boundary conditions
Autor:Menéndez, C.G.; Serafini, V.; Le Treut, H.
Filiación:Ctro. Invest. Mar y Atmosfera/C., Ciudad Universitaria, Pabellón 2, (1428) Buenos Aires, Argentina
Lab. de Meteorol. Dynamique/CNRS, Université P. et M. Curie, Tour 15-25, 4 place Jussieu, 75252 Paris Cedex 05, France
Palabras clave:Air-sea interactions; Meteorology and atmospheric dynamics (climatology; ocean-atmosphere interactions)
Año:1999
Volumen:17
Número:11
Página de inicio:1478
Página de fin:1492
DOI: http://dx.doi.org/10.1007/s00585-999-1478-2
Título revista:Annales Geophysicae
Título revista abreviado:Ann. Geophys.
ISSN:09927689
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09927689_v17_n11_p1478_Menendez

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Citas:

---------- APA ----------
Menéndez, C.G., Serafini, V. & Le Treut, H. (1999) . The storm tracks and the energy cycle of the Southern Hemisphere: Sensitivity to sea-ice boundary conditions. Annales Geophysicae, 17(11), 1478-1492.
http://dx.doi.org/10.1007/s00585-999-1478-2
---------- CHICAGO ----------
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" . Annales Geophysicae 17, no. 11 (1999) : 1478-1492.
http://dx.doi.org/10.1007/s00585-999-1478-2
---------- MLA ----------
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" . Annales Geophysicae, vol. 17, no. 11, 1999, pp. 1478-1492.
http://dx.doi.org/10.1007/s00585-999-1478-2
---------- VANCOUVER ----------
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. Ann. Geophys. 1999;17(11):1478-1492.
http://dx.doi.org/10.1007/s00585-999-1478-2