加热效应对南海季风低压垂直环流的贡献

人们对季风低压的研究大多是限于印度季风低压,而对南海季风低压研究甚少。近年来作者用合成法对南海季风低压的结构做了一些研究,同时根据FGGEⅢB资料用涡度方程和扰动动能方程做诊断分析,讨论了南海季风低压的发生发展过程。结果表明:对于南海季风低压的形成和维持,积云对流和环境场的作用有着重要贡献,而斜压不稳定和正压不稳定的贡献很小。

THE CONTRIBUTION OF HEATING EFFECT TO THE VERTICAL CIRCULATION OF MONSOON DEPRESSION OVER SOUTHERN CHINA SEA

The detail diagnostic analyses are made on two cases of Monsoon Depression over Southern China Sea by using FGGE3B data (no initialization),the diagnostic balance model (Krishnamurti, 1968) and the cumulus parameterization scheme (Kuo, 1974).The vertical circulation evolution of the Depression in the process of its genesis and development is contrasted in both cases, with and without diabatic heating. Meanwhile the studies are also made for the contribulion of latent heat to the vertical circulation. The results show that the largescale heating effect only plays a main role to the initial vertical motion field, and the cumulus heating effect is a main factor to the strengthening and maintaining of the Depression vertical circulation.