大连市近60年降水变化特征分析

利用大连市1951—2010年逐月降水量观测资料,对大连市降水量的年代际、年、季、月分布特征进行全面分析。结果表明:大连市年代际、年降水量均呈减少趋势;春季降水量呈上升趋势,其余3个季节降水量均呈下降趋势,其中尤以夏季降水量减少最多;各月降水量分布非常不均,7月平均降水量最多,2月平均降水量最少;汛期集中了全年72.2%的降水量。

Analysis on Variation Characteristics of Precipitation in Dalian City in Recent 60 Years

Based on the datas of precipitation of Dalian city during the years from 1951 to 2010,the variation characteristics of decade,annual,seasonal,monthly precipitation in Dalian city were analyzed.The results showed that the variation characteristics of decade,annual precipitation in Dalian city appeared a decreasing trend;the precipitation in summer,autumn and winter decreased with the time sequence while that in spring increased and the maximum decrease of precipitation was in summer;the monthly precipitation was unevenly distributed with the precipitation in July was maximum and that in February was minimum;the flood season concentrated 72.2% of the whole year's precipitation.