盛夏南海北部台风和热带低压登陆前、后的对比分析

盛夏南海北部台风与热带低压登陆前、后对比诊断分析表明，影响这两类热带低值系统发展的物理因子和过程为：涡度平流作用对二者在海上发展都不利；有利的大尺度环境流场造成的气旋性辐合、气压场作功以及积云对流活动造成的涡度、扰动动能、热量的积累是台风，低压发展的基本因子；台风发展以斜压转换过程明显，热带低压发展以正压转换过程为主。

COMPARATIVE STUDY ON THE LANDING/LANDED TYPHOON AND TROPICAL DEPRESSION OVER THE NORTHERN AREA OF SOUTH CHINA SEA IN MID-SUMMER

A case study has been presented in this paper. between landing/landed typhoon and tropical depression over the northern area of South China Sea in mid-summer. It's found that typhoon development depends mainly on the baroclinic transformation process. While the tonicaldepression on the barotropic process. Those prior dominant factors for these low pressure syStems are cyclonic convergence of large scale enviroment, work by pressure, and disturbed kine matic energy by cumulus convection. On the contrast, the vortidty advection is not a prior factor for the development of these low pressure systems.