关键词: 天津, 降水量, 降水日数, 线性倾向估计, 突变检验

Abstract: Based on daily precipitation data from 1958 to 2007 in Tianjin, the characteristics of precipitation were analyzed. The results indicate that annual precipitation and annual precipitation days decrease with 8.9 mm/10 a and 4.1 d/10 a in recent 50 years in Tianjin, respectively. The decreasing trend of annual precipitation days is more significant than that of annual precipitation. Precipitation decreases obviously in summer and winter, while it increases in spring and autumn. Precipitation days are the decreasing trends in four seasons. The obviously abrupt changes of annual precipitation days and summer precipitation occur about 1980 and in 1989 respectively, while abrupt changes of precipitation days in different seasons are in 1970s or 1980s, except in winter. The nonsynchronous variations of precipitation days and precipitation show that extreme precipitation events will increase, which is unfavorable for agricultural production and ecological environment.