我国南方春季双层锋区锋生过程的分析

THE ANALYSES ON FORMATIONAL MECHANISM OF DOUBLE-LEVEL FRONTAL ZONES IN SPRING OVER SOUTH OF CHINA

中文摘要:

      在我国南方春季连阴雨期间.经常存在着南、北两支急流.南支急流下方,存在着双层锋区,亦即存在着不相连接的高空锋区与低空锋区(图1)^[1].多层锋区现象早在1951年谢义炳、陈玉樵就曾指出过^[2],1953年Mohri亦作过研究^[3].其它有关文献虽也有不少描述,但对其成因却讨论较少.本文拟利用高原东侧稠密的探空站资料,借助客观分析方法及锋生公式对其进行分析.

英文摘要:

      In this paper,the double-level frontal zones under south branch jet in spring over south of China are investigated based on the dense radiosonde resports.The results calculated from the frontagenetical formula show that the lower-level frontal zone is mainly due to the air flow coavergence,whilc the upper-level frontal zone is primarily caused by the different distribution of vertical motion,i.e. ∂ω/∂y<0.