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Stratosphere-Troposphere Coupling: The Importance of Stationary Planetary Waves

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If you have a question about this talk, please contact Ryan Woodard.

Open to non-BAS; please contact Gary Abel (gaab@bas.ac.uk or 221281) if you would like to attend.

I will discuss the impact of topographically forced stationary waves in the dynamical coupling between the stratosphere and the troposphere in a simple atmospheric General Circulation Model similar to that of Polvani and Kushner (2002, GRL ). I find that the mean structure and variability of the polar vortex in this model is very sensitive to the structure of the topography, and Northern Hemisphere-like variability, with the correct frequency of warming events, occurs only for a relatively narrow range of topographic heights. The variable polar vortex (i.e. one associated with realistically frequent sudden warmings) is less coupled to the troposphere on climatological timescales than in the absence of topographic forcing. On intraseasonal timescales, however, coupling between the stratosphere and troposphere depends critically on the stationary wave induced variability of the polar vortex.

This talk is part of the British Antarctic Survey series.

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