Other
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.a31c..04m&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #A31C-04
Other
3334 Middle Atmosphere Dynamics (0341, 0342), 3349 Polar Meteorology, 3362 Stratosphere/Troposphere Interactions, 3367 Theoretical Modeling
Scientific paper
The Polar Vortex Reversal laboratory experiments have been done by using a shallow water rotating tank with hemi-spheric planetary beta effect. In the experiment, the planetary waves are excited at the lower latitudes, and propagates into the higher latitudes through rigid rotating westerly polar vortex ( westerly wind ), finally the initial westerly vortex is reversed into easterly in high latitudes, which correspond with the stratospheric sudden warming. In the experiment, the weak initial westerly polar vortex is easily reversed, and the reversal of strong initial polar vortex is hard to happen. This property of the reversal suggests a positive feedback mechanism between the polar vortex and the reversal in real atmosphere. Through weak initial westerly polar vortex, once the deceleration of polar vortex would happen, the secondary deceleration would happen much more easily, even if the polar vortex would be restored through the way of thermal process. As a result, the weak winter mean polar vortex may have a tendency to be maintained. Vice versa, in strong initial polar vortex In order to survey the above feedback mechanism, observed atmospheric polar vortex reversals have been investigated by using the NCEP data. As a result, In the frequency distribution of strength of stratospheric polar vortex averaged over winter season in high latitudes during the past 50 years, we can see the double peaks which correspond with the strong winter mean polar vortex and the weak one, like as the above suggestion. Index of deceleration of stratospheric polar vortex in winter high latitudes was defined at each year, and fluctuation of the index was compared with other winter mean indexes, year by year. As a result it was found that the polar vortex deceleration index has not only strong positive correlation with sub-tropical tropospheric jet but also negative correlation with mid-latitudinal stratospheric westerly wind, like as the above laboratory experiment.
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