Reponses of middle atmospheric circulation to the 2009 major sudden stratospheric warming

作者：ShengYang Gu,Xin Hou,JiaHui Qi,KeMin TengChen,XianKang Dou

摘要：In this research, the roles of gravity waves and planetary waves in the change to middle atmospheric residual circulation duringa sudden stratospheric warming period are differentiated and depicted separately by adopting the downward control principle. Ouranalysis shows clear anomalous poleward residual circulation patterns from the equator to high latitudes in the lower winterstratosphere. At the same time, upward mean flows are identified at high latitudes of the winter upper stratosphere and mesosphere,which turn equatorward in the mesosphere and reach as far as the tropical region, and consequently the extratropical region in thesummer hemisphere. The downward control principle shows that anomalous mesospheric residual circulation patterns, includinginterhemispheric coupling, are solely caused by the change in gravity wave forcing resulting from the reversal of the winter stratosphericzonal wind. Nevertheless, both planetary waves and gravity waves are important to variations in the winter stratospheric circulation, butwith opposite effects.

發文機構：School of Electronic Information

關鍵詞：suddenstratosphericwarmingresidualcirculationgravityandplanetarywaves

分類號： P43[天文地球—大氣科學及氣象學]