宽甸地区降水序列趋势变化及周期分析

Analysis on Precipitation Sequence Trend and Cycles in Kuandian Area

利用1954—2008年55年降水观测资料,分析宽甸地区年降水变化特征、趋势变化和周期演变规律。结果表明:宽甸地区年降水量55年序列及年际逐一增加子序列呈现减少趋势,截至2008年倾向率为-4.180 mm/10年;20世纪60年代是降水量丰富期,对降水趋势变化有一定影响。30年滑动平均序列以1954—1983年降幅最大,速率为-11.889 mm/10年。在1954—2008年序列中,1964年和1967年出现2次降水突变减少,平均降水量分别减少227 mm和200.63 mm。

Based on precipitation data during nearly 55 years from 1954 to 2008, annual rainfall variation features, trend change and evolution cycle of precipitation in Kuandian County were analyzed. It showed that 55 years length sequences of annual gradually-increasing subsequence of precipitation. As of 2008 ,the trending rate is -4.180 mm per 10 years.1960s was plentiful rainfall period,has certain influence on the precipitation trend change.30 years moving average sequence reaches the maximum values during 1954 to 1983 ,the rate was -11.889 mm per 10 years.As for sequences during 1954 to 2008 ,in 1964 and 1967 the precipitation suddenly reduced by 227 mm and 200.63 mm respectively.