摘要
作者利用每日 4个时次的 1°× 1°NCEP资料、逐时的GMS 5卫星红外云图资料、雷达组合反射率及雷达回波顶高图像资料和上海雨量自动站观测资料 ,对 2 0 0 1年 8月 5至6日上海特大暴雨过程进行了分析 ,认为 :( 1 )停滞在上海地区的热带低压为此次特大暴雨的发生提供了有利的背景 ,而低压内部不断更替出现的中尺度对流云团是暴雨的直接制造者 ;( 2 ) 5日夜至 6日晨 ,热带低压内至少有四个中尺度雨团发生发展 ,雨团的水平长度小于 1 0 0km ,宽度约 5 0 km ,生命史 1～ 3h不等 ,属于典型的β中尺度系统 ;( 3)来自西太平洋和南海的暖湿气流向上海地区输送了充足的水汽 ;( 4 )热带低压内对流层低层的辐合、高层的辐散有利于强上升运动的维持 ,强上升气流携带充足的水汽、能量有利于对流云团的发生发展 。
A strong heavy rainfall occurred in Shanghai during 5-6 August 2001.The above-mentioned case has been analyzed using the special observational data, including automatic meteorological stations data, radar images and satellite images. The results show that the heavy rainfall was mainly associated with the mesoscale convective systems developing in landing tropical depression(TD). Four main rain clusters, at least, have been found in Shanghai from 16 BLT (Beijing Local Time) 5 August to 08 BLT 6 August 2001. The horizontal size of them was about tens kilometers and the life cycle was around 1-3 hours which belonged to the typical meso-β systems. There were moisture convergence zones in middle and lower troposphere in Shanghai. It was emphasized that the TD provided the favorable environmental conditions for occurrence of heavy rainfall. In addition, it is noticed that the South China Sea and the West Pacific may be the important moisture source place.
出处
《大气科学》
CSCD
北大核心
2004年第2期254-268,i004,共16页
Chinese Journal of Atmospheric Sciences
基金
国家重点基础研究发展规划项目G1 9980 40 90 8
国家自然科学基金资助项目 49875 0 1 1资助
关键词
热带低压
暴雨过程分析
中尺度
上海
城市气象灾害
tropical depression
heavy rainfall
meso-scale system
meteorological disaster in city
