“03.7”江苏大暴雨凝结潜热的数值模拟  

Numerical Simulation of Impact of the Condensation Latent Heat on "03.7" Rainstorm in Jiangsu Province

作　　者：濮梅娟[1] 沈树勤[1] 夏瑛[1] 曾明剑[1] 解令运[1] 陆维松[2] 

机构地区：[1]江苏省气象局,江苏南京210008 [2]南京信息工程大学,江苏南京210044

出　　处：《高原气象》2007年第2期333-343,共11页Plateau Meteorology

基　　金：江苏省气象局重点项目(200601)"重大气象灾害与突发公共事件应急服务系统"研究资助

摘　　要：运用美国中尺度数值模式（MM5）对2003年7月4～5日江苏省中部的大暴雨过程进行了有无降水凝结潜热加热的数值模拟研究。模拟结果表明，凝结潜热释放能使高层负涡度和低层正涡度强烈发展，形成地面至500hPa深厚的正涡度柱；使高层辐散、低层辐合和垂直上升运动显著增大一个量级；能诱发低空中尺度涡旋发生发展；使降水量增幅一个量级。凝结潜热释放是暴雨发生和雨量增幅的一种重要物理机制。Using the MM5V3 mesoscale numerical model, the rainstorm in middle Jiangsu Province from 4 to 5 of July 2003 is numerically simulated. The results indicate that the condensation latent heat releasing can cause negative vorticity in upper level and positive vorticity in lower to develop intensely and then form profoundly positive vorticity columniations from ground to 500 hPa in high; make divergence in high, convergence in low and vertical raising velocity one order of magnitude higher than before; induce the cyclone of MCS in low to develop; make the rainfall amplitude. Thereby condensing heat releasing is an important physical mechanism to cause and amplify this rainfall.

关 键 词：江苏地区 “03.7”暴雨 MM5V3模式 有无潜热加热 数值模拟 

分 类 号：P458.121.1[天文地球—大气科学及气象学]