淮河流域一次梅雨锋暴雨的中尺度动力特征分析  

Mesoscale dynamic feature analysis of a rainstorm happening along plum rains front in Huaihe River Basin

作　　者：王勇[1,2] 丁治英[1,2] 沈新勇[1,2] 李勋[3] 

机构地区：[1]南京信息工程大学大气科学学院,江苏南京210044 [2]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 [3]海南省气象台,海南海口570203

出　　处：《自然灾害学报》2012年第3期126-135,共10页Journal of Natural Disasters

基　　金：国家自然科学基金项目(40975037;41075039);国家重点基础研究发展项目规划"973"(2011CB403405);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)

摘　　要：针对2007年7月8日发生在苏皖淮河流域的暴雨,采用WRF中尺度数值模式模拟结果、FNL每日4次1°*1°再分析资料、6h地面实况观测降水资料和FY-2相当黑体亮温TBB资料对该次降水的发生、发展过程进行了分析研究。结果表明:(1)该次降水在有利的大气环流形势下,强降水发生在呈准东西向分布的梅雨锋上。位于蒙古国与我国华北—东北交界处上空的切断低压给淮河流域输入了冷空气。冷空气与西南低空急流带来的暖湿气流交汇,增强了大气斜压性;(2)正的非热成风涡度的发展促进了高层相对于低层的辐散减压,有利于垂直上升运动的发展;(3)低空强急流带所形成的动力、热力和水汽条件对暴雨落区位置产生了重要影响。In view of the rainstorm which happened in Huaihe River Basin on July 8,2007, this essay adopted the simulation results of WRF mesoscale numerical model, the FNL reanalysis data, the precipitation data from 6-hour observation of the practical condition and the TBB data from FY-2 satellite to analyze and investigate the process of precipitation. Results show that ： （ 1 ） The precipitation happened under the favorable situation of atmospheric cir- culation and the heavy precipitation happened along plum rains front which distributes in the direction of quasi-east- west. The cut-off low pressure which lies over the boundary of Mongolia and north and northeast China inputs into Huaihe River Basin cold airstreams which intersected with the warm and humid airstreams brought by the jet stream in the minimum altitude of southwest. The intersection enhances the atmospheric baroclinicity. （2） The develop- ment of positive non-thermal-wind vortices helps the divergence decompression of high level relative to lower level and benefits the ascending motion. （3） The jet stream band formed in the low altitude creates suitable conditions of power, heat and vapor which greatly influence the location of rainstorm-bands.

关 键 词：天气学 诊断分析 梅雨锋暴雨 热成风 低空急流 

分 类 号：P426.6[天文地球—大气科学及气象学]