近56年玉门四季降水量对气候变化的响应

利用1953～2008年玉门镇四季降水量，分析了近56年玉门的四季降水量变化趋势，气候突变、异常年份等。结果表明，春季降水量长期变化趋势不明显；夏季降水量呈上抛物线变化趋势，秋季表现为增多趋势，冬季降水量呈明显的下抛物线变化趋势。20世纪50年代除冬季降水量较多外，其他各季降水量都较少；60年代春季降水量较多；70年代夏季降水量较多；60年代和80年代秋季降水量都较少；90年代后冬季降水量较多。冬季降水量增多与气候变暖的响应更强；夏季降水量在1979年发生了突变，之前呈增多变化趋势．之后呈减少变化趋势，冬季降水量在1984年发生了突变，之前呈减少变化趋势，之后呈增多变化趋势。

Responses of Precipitation in Four Seasons to Climatic Change in Yumen during 1953-2008

Make use of precipitation all the year round in Yumen City during 1953-2008,analyze change trend of annual precipitation,the weather mutation,abnormal year,etc..The results showed that: the long-term changing trend of precipitation in spring was not obvious;precipitation in summer showed a convex parabola changing trend,precipitation in autumn showed an increasing tendency,and in winter a concave parabola tendency.In 1950s,precipitation was less in all seasons except winter;in 1960s,relatively more precipit...