摘要
对江淮流域８例与低空急流相伴的大暴雨天气过程进行了热力学、动力学特征分析。结果表明：从散度方程的计算看，在低空急流的左前侧有较强的辐合增强区，有利于该地区出现强暴雨天气。条件对称不稳定通常与α中尺度雨带的发展有关。本文发现当条件对称不稳定区与低空急流的加强相联系时，有利于湿位涡的发展，对该地区强天气的发生有利。最后就各种物理量诊断的综合分析，提出未来暴雨天气的落区预报方法。
The thermodynamic and dynamic analysis on eight cases of heavy rainfall accompanied with strong low level jet in the Changjiang and Huaihe River valley are made in this paper It indicates by calculating the divergence equation that the convergence increases obviously in the area in front of and on the left side of the low level jet It shows a favorable condition to the development of the mesoscale systems The conditional symmetric instability usually relates to the development of meso-α scale rain belt It is found that when its unstable region appears with the strengthening of the low level jet, the severe weather may occur in that area The role of low level jet in the accumulation, transportation and release of the thermodynamic instability energy is also discussed Finally, based on the comprehensive analysis of various thermodynamic and dynamic variables, a forecasting method of heavy rainstorm position is suggested
出处
《大气科学》
CSCD
北大核心
1999年第1期112-118,共7页
Chinese Journal of Atmospheric Sciences
基金
国家自然科学基金
