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南亚高压南部环境位涡对台风加强的影响分析、

ISSN号：1004-4965
期刊名称：《热带气象学报》
时间：0
分类：P444[天文地球—大气科学及气象学]
作者机构：[1]南京信息工程大学气象灾害省部共建教育部重点实验室,江苏南京210044
相关基金：国家重点基础研究发展项目规划“973”（2009CB421503、2004CB418303）;国家自然科学基金（40775033）;国家自然科学基金（40975037）;公益性行业（气象）科研专项经费项目（GYHY20086009）;江苏省优秀科技创新团队基金;江苏高校优势学科建设工程资助项目（PAPD）共同资助

关键词：位涡, 台风加强, 南亚高压, 倾斜涡度发展(SVD), 位涡反演, potential vorticity（PV）, intensification of Typhoon, South Asia High（SAH）, Slantwise VorticityDevelopment（SVD）, PV inversion

中文摘要：

利用2002--2009年8年中。6、7、8、9月的NCEP1°x1°再分析资料对登陆我国大陆的台风与150hPa高层位涡的关系进行统计，8年中共有23个台风受到150hPa南亚高压南部边缘位涡的影响。其中3个台风（0216“森拉克”、0604“碧利斯”、0903“莲花”），在其发展初期在南亚高压南部的大值环境位涡进入台风中心后，台风中心气压下降。通过诊断分析从等值线的角度得出高层位涡与此类台风发展的关系，在150hPa高层正位涡异常的作用下，等熵面向大值位涡处汇聚，这种形式可使正位涡异常区两侧的等熵面向下倾斜，从而引起台风中高层的暖中心加强以及中层位涡增大，中层的位涡增大以及暖中心的出现又有利于低层气旋性涡度增长，导致台风中心气压下降，使台风强度增强。根据吴国雄的倾斜涡度发展（SVD）理论，其原因可能是等熵面倾斜使垂直涡度发展，从而加强对流运动潜热释放使台风暖心加强，使得台风的强度加强。通过位涡反演试验也证实了高层位涡对中层位涡发展的影响大于低层。

英文摘要：

NCEP 1°Х 1 ° reanalysis data set of June, July, August, and September from 2002--2009 is used in this study to statistically analyze the relationship between the 150 hPa level environmental potential vorticity （PV） located at the south edge of South Asia High （SAH） and the Typhoons landfall in China. The results show that： 23 typhoons are effected by 150 hPa level＇s PV which is located at the south edge of SAH from 2002--2009. The pressures of 3 typhoon centers （0216Senlaku, 0604Bilis and 0903Linfa） declined after the high value environmental PV of the south edge of SAH moved to the center of the typhoon. Through the diagnostic analysis from the view of the isoline, we found the relationship between the intensification of these typhoons and the PV anomaly of the high levels. The isentropic surface draw close to the high LeVers PV anomaly under the influence of the 150 hPa level＇s PV anomaly, which can lead to the isentropic surfaces of the PV anomaly＇s both sides decline. The warm core of the middle and high levels of the typhoon strengthens when the middle level＇s PV increases. Both of them result in the reinforce of the cyclonic vorticity in the low level. As a result, the center pressure of the typhoon declines. According to Guo-xiong WU＇s theory of Slantwise Vorticity Development（SVD）, the incline of the isentropic surfaces leads to the development of the vertical vorticity which contributes to the vertical motion and the release of the latent heat. Then the typhoon and its warm core are both strengthened. Piecewise PV inversion also points out that the high level＇s PV influences the mid-level greater than the low level.

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