攀枝花市自然降水资源变化特征分析

Analysis of Variation Characteristics of Precipitation Resources in Panzhihua

攀枝花地区的自然降水受西南季风水汽和地形再分配作用,时空分布差异明显。笔者利用攀枝花仁和站1965～2009年降水资料,统计分析了攀枝花年降水、汛期降水和各季节降水的气候变化特征。结果表明,20世纪70年代以来春季、夏季、汛期与年降水量的降水变化显著一致,目前呈现为增多趋势;秋季呈减少趋势。通过年降水的10年滑动平均可以看出,攀枝花市自然降水资源的年际变化有其自身的规律性,当前处于一个缓慢下降的态势。

Affected by the southwest monsoon water vapor and the topography redistribution, the differences of rainfall in spatial and temporal distribution was significant in Panzhihua Region. By using rainfall data during 1965 -2009 in Panzhihua, the variation characteristics of annu- al precipitation, seasonal precipitation and flood season precipitation were analyzed. The results showed that since 1970s＇, spring, summer, flood season and the annual precipitation changes were remarkable consistency, at present showing increase tendency, autumn showing reduced tendency. Through annual precipitation 10-years moving average, it was found that the annual variation of rainfall sources in Panzhihua City has its own regularity, at present, showing a slowly decreasing trend.