近48年抚州地区气候干湿状况分析

ANALYSES OF THE DRY-WET CHANGES OVER THE PAST 48 YEARS IN FUZHOU CITY

利用抚州市11个气象观测站的气温、降水量与蒸发量资料,计算分析气候干旱指数时空变化特征,同时分析降水、降水距平、蒸降差等特征变化,以揭示1962—2009年抚州地区气候干湿变化状况。结果表明,抚州市各地的干湿变化基本一致,干旱指数的变化是波动的且呈下降趋势。20世纪60年代、80年代中后期至90年代中期,是抚州市干旱出现较多时段;90年代后期至2002年,是洪涝出现较多的时段。干旱指数变小的趋势抚州市北部地区大于中、南部地区。降水增多,蒸降差呈下降且波动性强。

To reveal the changes of dry-wet over the past 48 years in Fuzhou area,the data of the annual mean temperature,precipitation and evaportation were used to analyze the trends of the drought index,percentage of precipitation and the difference between evaportation and precipitation from 11 stations in Fuzhou area.The results showed that the change of dry and wet stages was consistent with those of the whole Fuzhou area,and the drought Index decreased wavily.Droughts occurred frequently in 1960s and middle-late 1980s to middle 1990s,and floods often happened in the period of late 1990s to 2002.The dry-wet index,precipitation and the difference between evaportation and precipitation decreased in whole Fuzhou area,with those in north area smaller than those in middle and south area.