梅雨锋致洪暴雨的β中尺度涡旋机理的分析  

Mechanism Study of Meso-β Scale Vortex System of Heavy Rain in Meiyu Front

作　　者：陆汉城[1] 成巍[1] 朱民[1] 宋晓亮[1] 康建伟[1] 

机构地区：[1]解放军理工大学气象学院,江苏南京211101

出　　处：《解放军理工大学学报（自然科学版）》2002年第4期70-76,共7页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目 ( 4 0 175 0 12 ) .

摘　　要：利用模式高分辨率资料 ,对 β中尺度涡旋系统发生和发展的机理进行探讨 ,发现在湿中性条件下 ,中尺度气旋得到强烈发展是与物理量的中尺度输送和集中及局地区域产生急剧陡峭的上升运动有关。用辐散风动能转换函数诊断分析了暴雨不同时期β中尺度涡旋系统发展的能量来源 ,得出能量转换与涡散场相互作用的物理图像。这种能量转换增强与涡散场发展相互促进的正反馈过程是系统发展增强的主要因素 ,同时使得强烈上升运动不致很快消失 ,是暴雨生命史维持 1 0By using the high resolution model output data, further study on the cause of meso-β scale vortex system shows that the development of mesoscale vortex system is connected with the mesoscale transportation and accumulation of various thermodynamic and dynamic variables and abrupt vertical motion in regional area in the moist neutral stratification condition. The energy source for the development of meso-β scale vortex system in the different periods is diagnosed by divergent wind kinetic function. A concept model is proposed to explain the process of energy changes and the interaction between variables of vorticity and divergence. This process is the main cause of the enhanced development of the system. It also ensures intense vertical motion and makes the heavy rain to last a long time.

关 键 词：梅雨锋 致洪暴雨 涡旋机理 β中尺度涡旋系统 能量转换 涡散场 天气分析 

分 类 号：P458.121.1[天文地球—大气科学及气象学]