抚州市近50年降水气候特征分析

Analysis of Climate Features of Precipitation in Fuzhou City in Recent 50 Years

利用1961-2010年抚州市逐日降水资料,对抚州市年降水量进行时空分布特征分析,结果表明：年平均降水量空间分布极为不均,年平均降水量最少为1692.5 mm,最多为1979.1 mm,东部多于西部,北部多于南部;降水量存在着明显的年际、年代际差异,总体呈增加趋势,平均以25.3 mm/10 a的速度增加;降水量暖季多冷季少,年降水量主要集中在汛期4-7月,占年平均降水量的54.9%;EOF分析表明,抚州市年降水量空间分布主要呈现总体一致型,共同的天气影响系统和环流形势是其决定性因素;但也存在着南北与东西分布差异,这是由影响系统强弱、移动路径与地形等因素共同造成的。

Based on the daily precipitation data of Fuzhou city during 1961 - 2010,the spatial and temporal distribution characteristics of annual precipitation in this city were analyzed. The results showed that the spatial distribution of annual average precipitation was extremely uneven,the annual average precipitation varied from 1692. 5 mm to 1979. 1 mm,and it was more in eastern and northern part,while less in western and southern part. The precipitation existed obvious interannual and interdecadal differences,and it generally showed an increasing trend with the average increasing rate of 25. 3 mm /10 a. The precipitation in warm season was more than that in cold season,and the precipitation from April to July was the most within a year,accounting for 54. 9% of the annual average precipitation. EOF analysis indicated that the spatial distribution of annual precipitation in Fuzhou city was generally consistent,which was decided by the common weather affecting system and circulation situation; there was also differences in the spatial distribution of annual precipitation between the north and the south,and between the east and the west,which was caused by the intensity of the affecting system,moving path and geography together.