关键词: 降水日数, 年际变化, 空间特征, 突变分析, 石家庄

Abstract: Based on daily precipitation data from 1972 to 2007 in 17 weather stations of Shijiazhuang, the temporal and spatial distributions of different levels precipitation days were analyzed by linear trends method and Mann-Kendall mutation testing during the recent 36 years. The results show that the total precipitation days and different levels precipitation days decrease obviously, and the decreasing tendency of heavy rainstorm days is the weakest. An abrupt change of annual total precipitation days occurs in 1992, and precipitation evolves to extreme since 1990s. Annual total precipitation days and different levels precipitation days decrease from the northwest and the southeast to middle areas. There are rainy day center and rainstorm center in the northwest mountains areas and southeast plain. Annual total precipitation days and light rain days decrease obviously in each weather station, especially in the north, northwest and southeast areas. On the other hand, other levels precipitation days also decrease in most weather stations, while the speed of decrease is relative small.