The Antarctica Polar Vortex:. Study of Winter 2005

Details The Antarctica Polar Vortex:. Study of Winter 2005 The Antarctica Polar Vortex:. Study of Winter 2005

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009otam.conf..366l&link_type=abstract

Optical Turbulence: Astronomy Meets Meteorology, Proceedings of the Astronomy Meets Meteorology, Proceedings of the Optical Turb

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Polar Vortex, Atmospherical Effects, Optical Turbulence

Scientific paper

During winter and springtime, the flow above Antarctica at high altitude (upper troposphere and stratosphere) is dominated by the presence of a vortex centered above the continent. It lasts typically from August to November. This vortex is characterized by a strong cyclonic jet centered above the polar high. In a recent study1 of four different sites in the Antarctic internal plateau (South Pole, Dome C, Dome A and Dome F), it was made the hypothesis that the wind speed strength in the upper atmosphere should be related to the distance of the site to the center of the Antarctic polar vortex. This high altitude wind is very important from an astronomical point of view since it might trigger the onset of the optical turbulence and strongly affect other optical turbulence parameters. What we are interested in here is to localize the position of the minimum value of the wind speed at different heights in the troposphere, particularly above 10 km. For that we studied the analyses from the ECMWF for winter 2005 at different levels. We deduced a preferential position of this minimum, tilted with altitude, in a zone between South Pole and Dome A, for the year 2005. This extensive study over one entire winter confirms the "position space" of the polar high deduced by Ref. 1.

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