Characteristics and Influences of Precipitation Tendency in Foshan under Environmental Variations

Precipitation data of main precipitation stations of Foshan's 5 zones during 1956-2010 are ana- lyzed by Thiessen Polygons to explore the average monthly precipitation of Foshan. The method of linear re- gression is used to detect the variation characteristics of monthly and quarterly precipitation. The method of moving average and Mann-Kendall are used to explore the variation tendency, significance and mutation de- tection of Foshan's precipitation during those 50 years. Combined with the variation of climatic environment, these conclusions are drawn: the precipitation of Foshan is getting higher during 1956-2010, and a mutation of rising was detected in 1997; Foshan's annual average precipitation is positively correlated with the annual average temperature of Guangdong; the precipitation of summer is mainly controlled by urban heat island caused by human activities. No regular pattern is detected in annual variation of extreme precipitation.