灵丘县近56年降水特征及变化趋势分析

Recent 56 years precipitation characteristics and trend analysis in Lingqiu

文章采用灵丘县气象观测站1958—2013年的降水资料；分析了1958年到2013年灵丘县各年代际的年降水量、年平均降水量、四季降水量、日最大降水量和≥10．0mm的降水日数的演变规律；得出了灵丘县年降水量趋于减少，50年代末年平均降水量最多，60年代趋于减少，70年代降幅从缓，80年代降水略有增幅，90年代略有下降，20世纪截止2013年的降水量略有增加但是不明显。四季的降水变化较大，其中春季降水变化不明显，夏季降水量呈现明显减少的趋势，秋季降水增加，冬季降水量呈现减少的趋势，日最大降水量和10毫米以上降水日数呈现减少趋势，尤其≥50．0mm的暴雨日数在70年代之后更是明显减少。

Through the analysis of 1958 to 2013, Lingqiu decadal annual precipitation, an average annual rainfall precipitation of the four seasons, daily maximum precipitation and acuity 10.0 millimeters of precipitation days evolution law, draw a conclusion that Li tends to reduce in the 60s, 70 s decline ng sl annual rainfall tends to decrease, most of the late 50 s average rainfall, owly,precipitation increase slightly in the 80 s, fell slightly in the 90 s, the 20th century by 2013 precipitation increases slightly but not obvious. Precipitation change of four seasons is bigger, the spring precipitation change is not obvious, the summer precipitation shows the tendency of decreased significantly, the autumn precipitation increase the winter precipitation shows the tendency of decrease, daily maximum precipitation and precipitation days showed a trend of decrease over 10 mm,especially after the rain days in the 70 s.