江淮气旋暴雨中的能量收支  

A ENERGETICS ANALYSIS OF A CYCLONE ASSOCIATED WITH HEAVY RAINOVER YANGTZE-HUAIHE VALLEYS IN 1991

作　　者：韦统健[1] 胡迪[1] 

机构地区：[1]南京大学大气科学系

出　　处：《气象科学》1996年第1期12-19,共8页Journal of the Meteorological Sciences

摘　　要：本文利用MM4模式对91年7月6～7日江淮气旋暴雨过程进行了模拟，并将输出结果用于能量平衡计算。发现在气旋发展过程中动能一直有显著增加，其能源主要来自水平动能通量散度，而有效位能通过散度风动能向旋转风动能的转换也是不可忽略的。散度风动能向旋转民动能的转换主要通过柯氏力的作用来实现。虽然散度风动能只占总动能的1．77％，但它的变化和暴雨有密切的关系。Using the PSUINCAR mesoscal model (MM4),a numerical simulation was performed for a cyclonic developing process over YangtzeHuaihe valleys. The modeling output data was employed to evaluate the energies and their conversions in system. The results show that the development of the surface cyclone is accompanied by a obvious increase of the rotational kinetic energy. From the analysis of the contribution of different terms to the energy, the import of the surrounding kinetic energy is the predominant energy source,but the energy conversion of the divergent kinetic energy into rotational kinetic energy can not be neglected.The energy conversion that goes to the rotational kinetic energy from the divergent kinetic energy is mainly accomplished through Coriolis force effect. Even though the divergent kinetic energy is only 1. 77 % of the total kinetic,its variation is closely related to heavy rain

关 键 词：气旋 散度风动能 暴雨 能量收支 

分 类 号：P444[天文地球—大气科学及气象学] P433