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南半球平流层极涡崩溃早晚年环流异常特征
发布日期:2014-01-20 18:07:12    点击次数:10611        

Abstract:  Polar vortex breakup is an important circulation transformation process in Stratosphere. The 31 years reanalysis data was used to investigate the character of early and late breakup of polar vortex in Southern Hemisphere Stratosphere. The result shows that the circulation anomalies are consistent from lower to high Stratosphere with positive temperature anomalies and geopotential height anomalies and negative zonal wind anomalies prior to and after the early breakups. Such character is not obvious in the late breakups and the anomalies are contrary with that in early breakups. The consistent anomalies during the process of polar vortex breakup in Southern Hemisphere are different with that in Northern Hemisphere polar vortex breakups, which have opposite anomalies before and after the vortex breakups. Further investigation demonstrates that planetary waves play an important role in the Southern Hemisphere vortex breakup. Upward planetary wave is stronger and lasts longer in early breakups, while it is weaker in late breakups. Through wave and circulation interaction, the anomaly of upward planetary wave leads to the positive and negative geopotential height at high latitude in Stratosphere in October of early and late breakup years. The geopotential height anomalies at high latitude in Stratosphere persist and finally affect the breakup time of polar vortex. The analysis also shows that there may be some connection between the late breakups and La Nina, while the connection is not evident in early breakups.

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南半球平流层极涡崩溃早晚年环流异常特征.pdf

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