Transient Characteristics of Residual Meridional Circulation during Stratospheric Sudden Warming |
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Authors: | DENG Shumei CHEN Yuejuan HUANG Yong LUO Tao and BI Yun |
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Institution: | Anhui Institute of Meteorological Sciences, Hefei 230031,School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230031,Anhui Institute of Meteorological Sciences, Hefei 230031,School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230031,School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230031 |
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Abstract: | The residual meridional circulation derived from the transformed
Eulerian-mean thermodynamic equation and continuity equation can be
separated into two parts, the slowly varying diabatic circulation and the
transient circulation, as demonstrated by others. We calculated and
composite-analyzed the transient and diabatic circulation for 14
stratospheric sudden warming (SSW) events from 1979--2002 by using the daily
ECMWF reanalysis data. Specifically, the transient residual meridional
circulation was calculated both with and without inclusion of the eddy heat
transport term in the transformed Eulerian-mean thermodynamic equation to
investigate the importance of the eddy heat transport term. The results
showed that calculations of transient residual meridional circulation
present rapid variations during SSWs, with or without inclusion of the eddy
heat transport term. Although the patterns of transient residual meridional
circulation with the eddy heat transport term were similar to that without
the eddy heat transport term during SSW, the magnitudes in the upper
stratosphere and high-latitude regions differed. As for the diabatic
circulation, its daily variations were small during SSW events, and its
patterns were in agreement with its monthly average. |
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Keywords: | stratospheric sudden warming transient residual meridional circulation composite analysis |
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