一次短时暴雨天气的稳定度和能量参数分析  

Analysis of the Stability and Energy Parameters in a Short-time Rainstorm

作　　者：林丽[1] 李荣[1] 张霞[1] 冯慧敏[1] 王红兴[1] 

机构地区：[1]郑州市气象局,郑州450005

出　　处：《气象与环境科学》2007年第4期45-48,共4页Meteorological and Environmental Sciences

摘　　要：利用常规探空资料,对2006年8月25日发生在郑州市的短时暴雨过程中的稳定度和能量参数进行了诊断分析,结果表明：对流有效位能和深对流指数在暴雨开始前有较明显的增大,且峰值与降水增强时段有6-12 h的提前量;稳定度指数也与短时暴雨的发生、发展有着良好的对应,当测站对流稳定度指数在-10℃以下、K指数达到35℃以上、A指数值增大到10℃以上时,遇有触发机制,极易产生强对流暴雨。Basing on conventional sounding information, this paper analyzes the stability and energy parameters in a short-time rainstorm which occurred in Zhengzhou on August 25, 2006. The result shows the convective available potential energy and deep convective index increase significantly before the rain- storm, and their peak values are 6 - 12 h ahead of the enhancing raining term. The stability indices a good correspondence with the short-time rainstorm＇ s occurring and development. When the convective stability index is below - 10 ℃ and K index reaches above 35 ℃ , meanwhile A index increases above 10 ℃, it generate strong convective storm easily if it once encounters trigger mechanism.

关 键 词：短时暴雨 稳定度指数 能量参数 

分 类 号：P458.3[天文地球—大气科学及气象学]