Using NCEP/NCAR 1°×1° FNL datasets, the CMA surface precipitation data and Qinghai-Tibetan Plateau and shear line year books, the dimensional structure characteristics and their causes of the plateau shear line S1019 were diagnosed which occurred on July 16-17, 2010. The results show, in its generative development period, there exist strong divergence area near the South Asia high ridge, and low level relative vorticity has developed rapidly in the aspect of scope and intensity. Overall, it shows a baroclinic vertical structural configuration. It appears a "warm and wet core" structure near the height of 300 hPa, the apparent heat source Q1 and apparent moisture sink Q2 both strengthening in the vertical direction, the Q1 maximum value center lifted from 400 hPa up to 300 hPa while the positive extreme value of Q2 decreased from 300 hPa to 600 hPa. In the decaying period, the divergence area decreased significantly near the top of 100 hPa along South Asia high ridge, it mainly appears wet and cold in the upper troposphere, the low level relative vorticity value decreases in the scope and intensity, the southwest vortex gradually moves out of the Qinghai-Tibetan Plateau area, the lower level completely controlled by the cold and wet air. When the precipitation tends to end, both the apparent heat source Q1 and apparent moisture sink Q2 reduce quickly.
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