Analysis of the Role Played by Circulation in the Persistent
Precipitation over South China in June 2010 |
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| Authors: | YUAN Fang CHEN Wen and ZHOU Wen |
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| Institution: | Center for Monsoon System Research, Institute of Atmospheric Physics,
Chinese Academy of Sciences, Beijing 100190,
Graduate University of the Chinese Academy of Sciences, Beijing 100049 |
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| Abstract: | South China (SC) experienced persistent heavy rain in June 2010. The
climatic anomalies and related mechanism are analyzed in this study. Results
show that the large-scale circulation pattern favorable for precipitation
was maintained. In the upper level, the South Asian High and westerly jet
stream provided a divergent circulation over SC. In the middle and low
levels, an anomalous strong subtropical high (STH) extended to the South
China Sea. The southwesterly monsoon flow along the northwest flank of the
STH transported abundant water vapor from the western North Pacific, the Bay
of Bengal, and the South China Sea to SC. The precipitation can be
classified into two types: the West Siberia low (WSL)-induced low-level
cyclone mode, and the STH-induced low-level jet mode. STH and WSL indices
are defined to estimate the influence of these two systems, respectively.
Analysis shows that both are critical for precipitation, but their
respective contributions differ from year to year. In 2010, both were
important factors for the heavy rainfall in June. |
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| Keywords: | South China precipitation circulation the subtropical
high the west Siberia low |
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