摘要
[目的]分析中卫市"7.28"区域性暴雨的成因。[方法]利用NCEP/NCAR再分析资料、Micaps常规资料,对2011年7月28日中卫市区域性暴雨天气成因进行分析。[结果]在"东高西低"环流形势下,200 hPa西风急流、500 hPa冷槽、700 hPa低涡和切变线的建立,以及850 hPa冷暖空气的快速交替和副热带高压的稳定北上,导致了此次暴雨天气的发生。暴雨落区位于高空急流的右侧,低空急流左侧,700 hPa切变线南侧。各物理量场的分析表明,暴雨区上空水汽条件、垂直运动、能量、涡度、散度及风场分布均有利于暴雨的产生。暴雨发生时,雷达回波主要表现为混合云降水回波,回波强度30～45 dBz,回波顶高7～8 km。[结论]该研究为以后中卫市的暴雨预报提供了一些经验及理论指导。
[ Objective] The research aimed to analyze formation reason of ＂7.28＂ regional rainstorm in Zhongwei City. [ Method ] NCEW NCAR reanalysis data and Micaps routine data were used to analyze cause of the regional rainstorm which occurred in Zhongwei City on July 28, 2011. [ Result] Under the east-high-west-low circulation situation, factors which caused this rainstorm included westerly jet at 200 hPa, cold trough at 500 hPa, low vortex and shear line at 700 hPa, quick ahemation of the warm and cold air at 850 hPa, stability and northwardmoving of the subtropical high. Falling zone of the rainstorm was located at the right of the upper jet, the left of the low-level jet and the south of 700 hPa shear line. Analyses of each physical quantity field showed that distribution of the moisture condition, vertical motion, energy, vor- ticity, divergence and wind field over the rainstorm area were all beneficial for rainstorm generation. When the rainstorm occurred, radar echo was mixed-cloud precipitation type. The echo intensity was from 30 to 45dBz, and top height of the echo was from 7 to 8 kin. [ Conclusion] The research provided some experience and theoretical guidance for future rainstorm forecast in Zhongwei City.
出处
《安徽农业科学》
CAS
2012年第9期5567-5570,共4页
Journal of Anhui Agricultural Sciences
关键词
区域性暴雨
影响系统
诊断分析
雷达回波
Regional rainstorm
Influence system
Diagnostic analysis
Radar echo
作者简介
白玲（1963-），女，宁夏中卫人，高级工程师，从事短期天气预报工作及暴雨研究，E-mail：nxzwqxj@163．com。
