豫北一次雷雨大风过程的干湿能量位涡数值分析

Numerical analysising of dry vorticity of a thunderstorm and wet energy potential process in North Henan

从大气基本运动方程及大气总能量概念出发，以2013年8月1日02时前后河南西北部的一次典型雷雨大风天气为例，利用NCEP资料对本次强雷暴大风天气过程进行分析，将干能量位涡与湿能量位涡的表达式及守恒性确定后，分析干湿能量位涡的耦合性在雷暴发生时所表现的特征。通过分析发现，干能量位涡的崩溃与湿能量位涡的正斜压项耦合性可以较好地预示雷雨大风天气，中高空干能量位涡在增强后的崩溃，有利于雷雨大风天气发生，低层湿能量位涡的不稳定正压与斜压系统耦合时，预示该区域将有雷雨大风发生。

Starting from the basic movement of atmospheric equations and the concept of atmospheric energy. Using a typical thunderstorm weather on August 1.2013.02 when around northwest of Henan as an example.The severe thunderstorm gale weather process were analyzed by using NCEP data.After calculating dry energy potential vorticity expression and the conservation of wet energy potential vorticity was determined.Analysis of energy potential vorticity and energy coupling in the features of thunderstorm. We find that barotropic and baroclinic coupling stem energy potential vorticity and the collapse of the wet potential vorticity of the energy can be used to predicting the Thunderstorm Gale Weather.In the upper stem collapse energy potential vorticity in the enhancement was Conducived to the occurrence of thunderstorm.low-level moisture energy potential vorticity instability barotropic and baroclinic system coupling indicating that the region will have thunderstorm occurred.