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SYNOPTIC ANALYSIS OF THE RELATIONSHIP OF COUPLING BETWEEN UPPER AND LOW-LEVEL JETS AND HEAVY RAINS

Xiao Wenjun Chen Qiushi (Department of Geophysics, Beijing University)  
A synoptical case study about the relationship between coupling of the upper and low-level jets and heavy rains is discussed in this paper. When the maximum of wind speed in upper level jet moves eastward to the east coast of China, it is found that a LLJ appears in the south of the entrance region on 700 mb level. The axis of LLJ is nearly parallel to the upper jet's axis. Heavy rains and a horizontal shear line occur in the region between two jets. The relationship between coupling of upper and low-level jets and heavy rains can also be clearly shown in a composite cross-section of wind fields.The observed results can be explained by the unstable gravity-inertia wave in the adjustment process when we use the splitting analysis method between the advec-tion and adjustment processes.
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