摘要
使用南昌站探空资料,计算出1998-2008年10年中I的气候分布特征,统计出2005-2008年景德镇市23次暴雨过程中I的平均场,最后与2010-2012年江西几次强暴雨过程中的I分布进行了对比分析,结果表明：暴雨发生前24 h,由江西、湖南南部有I高能舌经赣东北地区伸向安徽与江苏省北部,景德镇市处在伸展的高能舌内。在长江中下游N30°附近有明显的I锋区,景德镇市处东段锋区内。暴雨发生时,处景德镇以南的南昌、衢州值明显增强,而处景德镇以北的武汉、安庆的I值则有所降低,导致景德镇所处的I锋区的强度增强。暴雨结束后,不稳定能量得到充分释放,I明显减弱。个例分析表明,强暴雨区主要出现在I大值区以北1～2个纬距内的I强锋区中或大值区的北部边缘。
By using air sounding data of Nanchang,this article shows the characteristics of distribution of climatic Ⅰ from 1998 to 2008 and the average Ⅰ of 23 heavy rain storms from 2005 to 2008 was calculated which lead to some conclusions by comparing with the distribution of Ⅰ of several storms from 2010 to 2012. 24 hours before the storms,Jingdezhen is located in the in east high-level zone of Ⅰ near 30°N,which stretches from the south of Hunan and Jiangxi to Anhui and Jiangsu.When the heavy rain happens,the Ⅰ fronts over Jingdezhen enhance for the reason that it increases over Nanchang and Quzhou while decreases over Wuhan and Anqing. After the storms,the unstable energy is fully released and Ⅰ decreases obviously. Case analysis also support the conclusion that heavy rain fall occurs in the Ⅰ front which locates in the north of high level zone or the northern fringe of high level zone.
出处
《江西科学》
2014年第5期600-605,共6页
Jiangxi Science
基金
2013年中国气象局预报员专项(CMAYBY2013-037)
中国气象科学研究院灾害天气国家重点实验室2012年开放课题(2012LASW-B01)共同资助
关键词
暴雨
强天气威胁指数(Ⅰ)
空间分布特征
heavy rain
meteorological indexes
characteristics of distribution
