辽宁2008年3场暴雨对比分析  

Diagnostic analysis of three regional rainstorms in Liaoning in 2008

作　　者：孙欣[1] 陈传雷[1] 赵明[1] 贾旭轩[1] 吴晓峰[1] 

机构地区：[1]沈阳中心气象台,沈阳110016

出　　处：《气象科学》2010年第6期881-888,共8页Journal of the Meteorological Sciences

基　　金：中国气象局气象新技术推广项目(CMATG2009MS02);公益性行业(气象)科研专项(GYHY(QX)200906011)

摘　　要：利用常规气象观测资料、1.0°×1.0°NCEP再分析资料,针对辽宁2008年夏季三次区域性暴雨天气过程,在天气学分析的基础上,对低空急流、水汽场和能量锋相互作用产生暴雨的机制进行探讨。结果表明:低空急流对水汽和能量的输送起非常重要的作用,它一方面为暴雨的产生提供了所需要的大量水汽,另一方面又使得暴雨区低层大气增湿增暖,从而引起对流不稳定加强及垂直上升运动强烈,为暴雨的发生提供大量的不稳定能量。低空急流、纬向剖面上的宽且厚湿柱和能量锋的位置、强度与辽宁强降水的等级和落区关系密切。Using conventional observation and 1.0°×1.0° NCEP re-analysis data for 3 regional heavy rain storms in summer of 2008,the interaction mechanisms of low-level jet,water vapor field and energy front,which cause the rainstorm,is discussed in this paper,based on the synoptic analysis.The results show that low-level jet plays an important role for the delivery of vapor moisture and energy.On one hand,low-level jet provides much needed vapor moisture for the creation of rainstorm,on the other hand,it makes the lower atmosphere of rainfall area warming and humidifying,causing the convective instability to strengthen and vertical ascending motion to be severe,supplying a large amount of unstable energy for the occurrence of rainstorm.Low level jet,the wide and thick zonal cross-section of wet-column as well as the location,intensity of the energy front correlate closely with the level and the falling area of the heavy precipitation.

关 键 词：暴雨 低空急流 水汽 能量锋 

分 类 号：P458.121.1[天文地球—大气科学及气象学]