摘要
西南涡天气降水是中部区域春、秋季飞机人工增雨最主要的三种作业天气类型之一。利用常规气象观测资料和NCEP再分析资料,对2008年4月8 9日和2009年4月18 19日两次典型西南涡降水天气过程对比分析发现,近圆形和椭圆形西南涡的动力场结构存在一定差异。对增雨条件分析发现:两次过程500 h Pa上都存在大气垂直上升运动,低层水汽条件良好;500 h Pa冰面过饱和水汽压正值区均在低涡形成并影响中部区域时开始出现,并随低涡移动发展。因此,选择500 h Pa冰面过饱和水汽压≥0 h Pa且垂直上升速度≤-0.1 Pa·s-1的区域作为增雨潜力区。其中,近圆形西南涡过程增雨潜力区出现在低涡中心前方附近和暖式切变线北侧、低涡闭合线处,椭圆形西南涡过程增雨潜力区位于辐合线北端及低涡闭合线东北方向一定距离处。
Southwest vortex weather precipitation is one of the three most important weather types in the aircraft precipitation enhancement in spring and autumn in central area. Using regular meteorological observation data and NCEP reanalysis data,comparing the two typical southwest vortex precipitation processes,which are on 8 9 April 2008 and 18 19 April 2009,differences are found in the structure of dynamic field between approximately round and oval southwest vortex. By analyzing precipitation enhancement conditions of the two processes,atmospheric vertical motions are found on 500 h Pa and sufficient water vapor on low level. Positive zone of icy supersaturation vapor pressure on 500 h Pa appears when the vortex forms and affects central area,it moves and develops with the vortex. The area where icy supersaturation vapor pressure≥0 h Pa and vertical velocity≤-0. 1 Pa·s^-1 is selected as precipitation enhancement potential area. The precipitation enhancement potential area lives in front nearby of the center and the closed line of vortex,and the northern side of warm shear line when the vortex is approximately round,while the potential area is located on the northern part of convergence line and a certain distance from the northeastern direction of vortex closed line when the vortex is oval in shape.
作者
杨敏
黄毅梅
Yang Min;Huang Yimei(The Weather Modification Center of Henan Province,Zhengzhou 450003,China)
出处
《气象与环境科学》
2018年第1期69-76,共8页
Meteorological and Environmental Sciences
基金
中国气象局气象关键技术集成与应用项目(CMAGJ2014M33)
河南省气象局科研项目(Z201414)资助
关键词
中部区域
西南涡
增雨潜力区
central area
southwest vortex
precipitation enhancement potential area
作者简介
杨敏（1984-），女，河南商丘人，高级工程师，硕士，从事人工影响天气研究．E—mail：yangmin310@sina．cn;通讯作者：黄毅梅（1974--），男，湖北天门人，正研级高级工程师，硕士，从事云降水物理与人工影响天气研究．E-mail：huangyimei@sina．com
