第 3 6 卷第6 期
2 0 1 3 年 1 2 月
Vol. 36 No. 6
Dec. 2013
王巍巍,李艳伟.2013.低压倒槽影响下积层混合云形成过程模拟研究[J].大气科学学报,36(6):708-716.
Wang Wei-wei,Li Yan-wei. 2013. Simulation of formation process of convective and stratiform mixed clouds in depression inverted trough[ J]. Trans
Atmos Sci,36(6) :708-716. (in Chinese)
摘要:利用多普勒雷达资料和中尺度天气预报模式W RF (We at he r Research and Forecasting)模拟结
果,对 20 0 9 年 5 月9一1 0 日发生在太原及其周边地区的一次积层混合云降水形成过程进行分析。
结果表明,在积层混合云的形成初期,局地对流云得到发展,随着其强度不断增强,与周围云发生并
合过程(包括局地单体对流的并合、积云团的并合和积层混合云内强中心的并合),形成范围较大
的积层混合云云系。局地单体对流和积云团的并合可带来云体的爆发性增长,霰含量、雨水含量大
幅增加。积层混合云内强中心的并合对降水强度影响不大,但有利于降水面积扩大。低压倒槽和
弱冷锋是此次积层混合云形成和维持的主要影响因素。低压倒槽有利于低层大范围不稳定能量的
积累,风向切变有利于近距离云团的发展和并合,山地动力和热力作用有利于局地对流单体、积层
混合云内强中心的形成和加强。
关键词:积层混合云;并合过程;垂直结构
中图分类号:P426.5 文献标志码:A 文章编号:1674-7097 (2013) 06 -0708-09
S i m u l a t i o n o f f o r m a t i o n p r o c e s s o f c o n v e c t i v e a n d
s t r a t i f o r m m i x e d c l o u d s i n d e p r e s s i o n i n v e r t e d t r o u g h
W A N G W e i - w e i ,LI Yan-wei
(Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,NUIST,Nanjing 210044,China)
Abstract:Using the Doppler radar data and simulated results of the mesoscale model W R F (Weather
Research and Forecasting) ,this paper studies a precipitation process induced by convective and strati
form mixed clouds in Taiyuan and its siurounding areas during 9— 10 M a y 2009. Results show that the
local convection clouds are developed in the formation stage of convective and stratiform mixed clouds.
With development and strengthening of the convection,the convective and stratiform mixed clouds are
formed in a wider range,by means of merging process between the enhanced convection clouds and the
ambient clouds. The merging process includes the local single cells merging,the cloud clusters merging
and the high cores merging in convective and stratiform mixed clouds. The single cells merging and
cloud clusters merging can bring about the explosive growth of clouds with a sharp increase in graupel
content and rain water content. The high cores merging in convective and stratiform mixed clouds can
enlarge the rainfall area rather than the rainfall strength. The depression inverted trough and the were
cold font are main influencing factors of formation and maintenance of the convective and stratiform
mixed clouds. The depression inverted trough is beneficial to the accumulation of large-range convective
energy in the lower layer and the wind shear is favorable to the development and merging of cloud clus
ters at a short distance. The dynamic and thermal effects of mountainous region promote the formation
收稿日期:2012-05-08 "改回日期:2012-09-21
基金项目:国家自然科学基金资助项目(40975086)"江苏高校优秀学科建设工程资助项目(PAPD)
通信作者:王巍巍,博士生,实验师,研究方向为云雾降水、观测方法,wangweiwei@ nuist. edu. cn.
低 压 倒 槽 影 响 下 积 层 混 合 云 形 成 过 程 模 拟 研 究
王巍巍,李艳伟
(南京信息工程大学中国气象局气溶胶与云降水重点开放实验室,江苏南京210044)