宁夏2006-07-14暴雨天气过程能量场特征分析

Characteristic analysis of energy field of rainstorm on 14 July 2007 in Ningxia

根据实时高空及地面温、压、湿资料,制做出未饱和湿空气静力总温度、饱和湿空气静力总温度、饱和能量差、对流稳定度及潜在稳定度等能量图表,对宁夏中北部地区2006-7-14暴雨发生的能量场特征进行了分析.结果表明,该次暴雨的出现和早期出现的高能系统及深厚对流不稳定层有一定的对应关系.暴雨前,地面有能量锋、锢囚高能舌,高能中心与暴雨落区对应.说明能量诊断预报方法作为常规天气学方法的辅助手段,对提高宁夏暴雨的短时或临近预报准确率有重要的参考价值.

Energy diagram of the unsaturated moist static total temperature,saturated moist static total temperature,the saturated energy range, the convective stability and the potential stability are drawn by using of the conventional meteorological information of the temperature, pressure and humidity of the ground and high. Characteristics of the energy field on the torrential rain occurring on 14 July 2006 in middle-north part of Ningxia are analyzed by using of the energy diagram. The analysis shows the Ω system of the high energy and the deep convective instability before the occurrence of the rainstorm is an indicator of the torrential rain occurring in a certain sense. Before the occurrence of the rainstorm there are the energy front, the occluded high energy tongue and the centre of the high energy. They are the indicator of falling field of the torrential rain. The results show that diagnostic forecast method of energy is an auxiliary means of normal meteorological methods. It has important reference value that can raise forecast accuracy of short-time and close-time rainstorm prediction.