Causal Analysis of a Unusual Continuous Torrential Rainfall Event in Guangdong in Winter 2013
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Abstract:
Guangdong suffered the heaviest continuous torrential rainfall from 13 to 17 December 2013, according to the winter records since 1951 Based on the data of conventional meteorological observation, automatic weather station, and NCEP reanalysis, the characteristics and the possible causes of the continuous torrential rain are analyzed. The results show that the circulation situation at middle and high levels in Asia shows a “ridge in north and trough in south” pattern, which was favorable for the southward moving of cold air and the persistent meeting with the moist southerly from the Bay of Bengal and the South China Sea, and resulted in an unusual local meridional circulation above Guangdong. There appeared intense divergence at upper levels and intense convergence at lower levels, a favorable condition for torrential rainfall. Compared with the continuous freezing rain and snow weather in Guangdong at the beginning of 2008, the meridional wavelength of the ridge and trough was larger, and the extension of the trough was farther south than normal; therefore, the cumulative precipitation in this event was stronger without freezing rainfall.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.