一次华南前汛期暴雨过程的物理量诊断分析  

Physical Diagnosis of a Heavy Rainfall in Pre- flood Season in South China

作　　者：刘璇 

机构地区：[1]民航华东地区空中交通管理局气象中心,上海200335

出　　处：《安徽农业科学》2015年第13期254-258,共5页Journal of Anhui Agricultural Sciences

摘　　要：采用NCEP／NCAR1°×1°6h全球再分析资料、1h加密雨量资料和常规气象观测资料，从降水相关物理量入手，对“08．6．14”华南前汛期降水过程进行诊断分析。结果表明，来自孟加拉湾和南海源地的水汽为2008年6月14—19日华南降水提供了充足的枢汽条件；从地面到对流层顶存在的正负涡度耦合和正负散度耦合的双耦机制，构成了此次降水的动力机制；低层大气的不稳定层结和异常强烈的螺旋度为暴雨提供了启动机制。The physical diagnosis of precipitation during Pre - flood Season in South China from June 14th, 2008 is analyzed by using NCEP/ NCAR global reanalysis data with the resolution of 1°× 1°every 6 hours, hourly rainfall data and conventional meteorological data. The results indicate that during Pre - flood Season in South China from June 14th to June 19th, 2008, the Bay of Bengal and South China Sea transported abundant moisture towards South China. The coupling of positive ＆ negative vorticity and positive＆ negative divergence can be considered as a double coupling mechanism. And the double coupling mechanism existing from the ground to the tropopause constituted the dynamic mecha- nism of the precipitation. The instability of lower atmosphere and abnormal increased helicity provided a trigger mechanism to the heavy rain.

关 键 词：华南前汛期 暴雨 物理量 诊断分析 

分 类 号：S161.6[农业科学—农业气象学]