近63年盘锦地区春播期降水变化特征分析

Analysis on the Characteristics of Precipitation during Spring Sowing Period in Panjin Area in Recent 63 Years

应用盘锦地区1957~2019年国家基本气象站逐日降水资料,通过线性趋势、滑动平均、小波分析等方法,分析了盘锦地区春播期(3~5月)降水变化特征,并对盘锦地区春季首场透雨气候特征进行了分析。结果表明:盘锦春季降水量整体呈略有增加趋势,其中3月、5月为增加趋势,4月份降水量呈减少趋势;春季降水偏多偏少交替变化存在准20年和12年的年代际周期,不同阶段表现出明显的准6年、4年和2年的年际周期变化规律;春播期首场透雨平均出现日期在4月21日,出现日期的年际变化呈偏晚趋势;盘锦地区春季3~5月最长连续无降水日数平均高达20 d,春季无降水日数年际变化趋势呈增加趋势。

Using the daily precipitation data from the national basic weather station in Panjin area from 1957 to 2019,the characteristics of precipitation changes during the spring sowing period(March to May)in Panjin area were analyzed through linear trend,moving average,wavelet analysis and other methods.The climatic characteristics of soaking rain were analyzed.The results show that the overall spring precipitation in Panjin shows a slight increase trend,among which March and May are the increasing trends,and the April precipita-tion is decreasing;the spring rainfall is more and less alternating with a quasi-20-year and 12-year interdec-adal change.Cycle,different stages show obvious quasi-six-year,four-year and two-year inter-annual cyclical changes;the average date of the first soaking rain in the spring sowing period is April 21,and the inter-annual change of the appearing date is late;Panjin The average number of longest continuous no precipitation days in spring from March to May in the region is as high as 20 days,and the interannual variation trend of the num-ber of no precipitation days in spring is increasing.