2008年初南方冰雪天气逆温层特征及其维持机制  

Inversion layer feature and its maintenance mechanism during ice weather over southern China in January of 2008

作　　者：赵美艳[1] 徐海明[1] 

机构地区：[1]南京信息工程大学气象灾害省部共建教育部重点实验室,南京210044

出　　处：《气象科学》2010年第6期814-821,共8页Journal of the Meteorological Sciences

基　　金：国家重点基础研究发展计划(973计划)项目(2006CB403607);国家科技支撑计划项目(2007BAC29B02)

摘　　要：对2008年初的冻雨天气过程中大气层结特征做了研究,并集中对贵阳、南昌和南京三站的层结状况进行对比分析,分析结果表明:冻雨产生时对流层中低层有逆温层和暖层存在,且近地面温度须小于0℃;利用国际太平洋研究中心的区域气候模式IPRC-RegCM,对2008年1月18—2月2日期间的降水进行模拟并分3时段予以分析,利用模式输出结果分析3时段逆温层的维持机制。分析指出,模拟结果能较好的再现此次持续性过程的降水带分布;第一阶段逆温层上部的增温是由温度平流和凝结潜热加热共同作用,而后两个阶段则主要是温度的暖平流所致;对于逆温层底部的降温主要是由近地面的西北冷平流及空气的上升绝热冷却所致。The characteristics of atmospheric stratification of freezing rain process in early 2008 is analyzed,the stratification condition in Guiyang,Nanchang and Nanjing is diagnosed.The result indicates that the favorable condition for the freezing rain is the temperature inversion,warm layers in the lower troposphere,and the temperature on the ground surface must be less than 0 ℃.A regional climate model（IPRC-RegCM）,developed at the International Pacific Research Center（IPRC）,is utilized to simulate this rainfall event,which was divided into three stages,and then,the model output is used to analyze the mechanism for the maintenance of temperature inversion.The results are as follows： the numerical model can reproduce the distribution of precipitation band;the top＇s warming of temperature inversion during the first stage is affected by horizontal advection and latent heat of condensation,but during the next two stages,the top＇s warming is mainly maintained by warm advection;the bottom＇s cooling of temperature inversion is sustained by the cool advection and adiabatic cooling.

关 键 词：冻雨 逆温层 凝结潜热 

分 类 号：P458.122[天文地球—大气科学及气象学]