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Physical Characteristics of Heavy Rainfall Associated with Strong Low Level Jet

Zhai GuoqingDing Huajun(Department of Geography, Hangzhou University, Hangzhou 310028)(Hangzhou Meteorological Bureau, Hangzhou 310007)Sun ShuqingGao Kun(Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029)(Department of  
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
【Fund】: 国家自然科学基金
【CateGory Index】: P458.121.1
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