ANOMALOUS VARIATIONS OF GUANGDONG PRECIPITATION IN SUMMER IN RELATION TO MONSOON

The relationship between the variation of precipitation in Guangdong Province is investigated using the correlation analysis and composite comparison methods in conjunction with precipitation data from 36 surface weather stations in the province and reanalyzed 850 hPa data from NCEP, U.S.A. A significant positive correlation is found between the variation of precipitation in summer there and the intensity of the southwesterly over the South China Sea though without being so inconclusive that a strong southwesterly over the sea is accompanied by more rain in Guangdong. For the front-associated flood season in April-June, the former is a carrier of rainwater for Guangdong but with insignificant linkage with the intensity of the southwest monsoon. There is even such a situation in which the precipitation gets stronger though with a weakened southwest monsoon from the tropics in May-June, which is mainly attributable to the increase of monsoon from the subtropics. For the typhoon-associated flood season in July-September, the Guangdong precipitation increases as the southwest monsoon strengthens over the central and northern South China Sea and the subtropical monsoon reduces its effects on the province.