摘要
文章对１９９１年７月吉林省连续出现的两次较大的、不同性质的降水过程进行了诊断分析与数值模拟；分析发现，７月２０日的在暖区中发展起来的中尺度对流复合体纯积云暴雨过程，其视热源（Ｑ＿１）的垂直剖面呈双峰状；７月２１～２２日，在稳定的气旋降水中嵌有中尺度积云对流降水，其视热源剖面峰值较低，位于５５０ｈＰａ左右。模拟结果表明，在不同的天气系统中积云加热剖面的峰值高度是不同的，而这一差异对大尺度环境流场的反馈作用也是不同的。
Two cases of heavy rainfall occurred in Jilin province July,1991 are diagnosedand simulated by using MM2 and MM4 mesoscale models. The results of diagnosticanalyses show that the case of 20th July is a mesoscale cumulus complex ( MCC)developed in warm area. The vertical profile of the apparent heat source(Q_1)for thisheavy rain from the only curnulus cloud has two peaks. However, for case of 21th to22th July, MCCs embody in stable precipitation of cyclone with only one peak of Q_1apparent heat source vertical profile.This single peak is over about 550 hPa and is lowerthan the upper peak of the former case;The results from numerical simulation indicatethat the heights of cumulus heating peaks for different weather systems are differentand,this different of lieating peak heights may cause different feedback to large scaleenvironmental field.
出处
《应用气象学报》
CSCD
北大核心
1995年第2期171-176,共6页
Journal of Applied Meteorological Science
基金
国家"八五"攻关课题9060806资助
关键词
积云
降水
积层混合云
加热剖面
数值试验
Cumulus precipitation
Vertical profile of the heating
Numerical experiment
