【作者】 郑峰；

【Author】 Zheng Feng (Nanjing Institute of Meteorology,Nanjing 210044, China)

【机构】 南京信息工程大学大气科学系；

【摘要】 利用NCEP1x1再分析资料对2001年8月3～4日浙南闽北的东风波暴雨过程,根据螺旋度和Q矢量分析了过程中的暴雨演变以及雁荡山脉[1]诱生中尺度低涡发生发展的原因,同时提出螺旋度锋区和Q矢量散度锋区的概念,结果表明:螺旋度、Q矢量散度大值中心和锋区的强度及位置的演变较好反映了暴雨落区和中尺度低涡的诱生、移动,螺旋度、Q矢量的时空演变对暴雨发生有一定的预示意义,螺旋度计算较Q矢量计算的诱生低涡初生位置准确,螺旋度锋区和Q矢量散度锋区叠加区准确呈现出暴雨的落区、诱生低涡的初生位置,说明该锋区叠加区对降水和系统的诊断能力强,具有很好的指示意义。更多还原

【Abstract】 It introduces mainly the process of the most heavy shower occurring in south seacoast of Zhejiang caused by eastly wave from August 3 to 4 ,2001.At the same time,we discuss the low cyclonic eddy caused by eastly wave.Helicity and its effects on the all process are seen.The results show that there exits close relationship between helicity and the most heavy shower,the higher helicity might be one of the mechanisms for rain storm development. The paper also shows that close relationship exits between Q vector divergence and the most shower. The common region of high Q vector divergence and high helicity can forcast low cyclonic eddy and rain strom better.更多还原