初夏华南两类季风槽的对比研究——1.诊断分析

本文采用多层非线性平衡模式及动能平衡和能量转换方程对华南两类季风槽进行了对比研究。研究表明,陆上类风的无辐散部分引起的垂直运动是基本的,而大尺度凝结加热和积云对流加热引起的垂直运动有很大的增幅作用,海上类垂直运动场主要靠弱积云对流维持。两类季风槽内辐散风的动能制造及次网格尺度效应都是主要的动能源,而无辐散风则引起负的动能产生。两类季风槽内都有一致的正斜压转换。 

ACOMPARATIVE STUDY FOR TWO KINDS OF MONSOON TROUGH OVER SOUTHERN CHINA IN EARLY SUMMER

A comparative study is made between the land and sea monsoon troughs by applying diagnostic balance model, kinetic energy balance equation and energy convertion equatio, ns.For the land trough, the vertical motion associated with non-divergence wind is basic and those associated, with the large scale condensation and cumulus convection heating have large amplifying effects.But for the sea trough, its vertical motion field is mainly maintained by cumulus convection.The kinetic energy generation induced by divergence wind and the subgrid scale effect is the main kinetic energy source for both cases, meanwhile the non-divergence wind cause negative kinetic energy generation.There exists positive baraclinic convertion within both kinds of monsoon trough.