一次强降水过程的热量和水汽收支分析  

Analysis of Heat and Moisture Budget of a Heavy Precipitation Process

作　　者：王爱君 宋晓辉[2] 田秀霞[2] 王丽英[2] 李菊香 

机构地区：[1]丰南区气象局,河北丰南063300 [2]邯郸市气象局,河北邯郸056001

出　　处：《气象与环境科学》2010年第B09期1-5,共5页Meteorological and Environmental Sciences

基　　金：国家自然科学基金项目（40875024）;河北省自然科学基金项目（D2008001282）资助

摘　　要：利用NCEP／NCAR每日4次全球再分析1°×1°网格资料，计算了2007年7月18日河北南部暴雨过程的水汽通量、视热源（Q1）和视水汽汇（Q2），分析了降水区热量和水汽收支的变化，并探讨了其垂直分布特征。结果表明：本次暴雨过程是由沿低涡切变线相继生成并强烈发展的中尺度对流云团造成的；当有强对流发生并伴有强降水时，就会有强的视热源Q1和视水汽汇Q2出现，且与强降水区基本对应，对流层上半部的相对冷层为暴雨区上空积云对流提供了极为有利的热力不稳定条件。By using the NCEP/NCAR global reanalysis grid data （4 times per day）, the vapor flux, apparent heat source（ Q1 ） and apparent moisture sink（Q2） of a severe rainstorm on July 18 th, 2007 in southern Hebei province, the features of heat and moisture budgets and its vertical distribution over the precipitation areas were analyzed. Results show that the rainstorm was caused by meso-scale convective cloud cluster successive generating and developing along the low vortex with shear line. Strong convection with heavy rainfall produce strong apparent heat source Ql and apparent moisture sink Q2, the higher value regions Q1 and Q2 basically corresponded with the heavy rainfall region. Relative cooling level in the upper troposphere provides favorable unstable thermodynamic condition for cumulus convection over rainstorm areas.

关 键 词：暴雨 视热源 视水汽汇 

分 类 号：P458.3[天文地球—大气科学及气象学]