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GEOPHYSICAL RESEARCH LETTERS, VOL. 32, L23806, doi:10.1029/2005GL023804, 2005

Simulation of Polar Antarctic trends: Influence of tropical SST

Barbara Grassi

Department of Physics, University of L'Aquila, Coppito-L'Aquila, Italy


Gianluca Redaelli

Department of Physics, University of L'Aquila, Coppito-L'Aquila, Italy


Guido Visconti

Department of Physics, University of L'Aquila, Coppito-L'Aquila, Italy


Abstract

The polar Antarctic atmosphere has been recently characterized by a progressive intensification of the circumpolar westerly winds, both in the stratospheric and tropospheric component. We simulate the response of the polar southern hemisphere atmosphere to a prescribed trend of oceanic equatorial temperature to demonstrate a possible link between the progressive warming of tropical sea surface temperature (SST) and Antarctic climate changes in the last decades. Model simulations produce an atmospheric response suggesting an influence of equatorial SST on polar dynamics, particularly during summer months.

Received 14 June 2005; accepted 27 October 2005; published 6 December 2005.

Index Terms: 1610 Global Change: Atmosphere (0315, 0325); 3337 Atmospheric Processes: Global climate models (1626, 4928); 3339 Atmospheric Processes: Ocean/atmosphere interactions (0312, 4504).

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Citation: Grassi, B., G. Redaelli, and G. Visconti (2005), Simulation of Polar Antarctic trends: Influence of tropical SST, Geophys. Res. Lett., 32, L23806, doi:10.1029/2005GL023804.