摘要
利用淮海地区1955—2004年23个气象站点的逐日降水资料,分析了淮海地区降水的主要周期振荡以及突变点,结果表明:该地区降水均有多个时间尺度的周期变化特征,降水周期变化显著,干湿交替现象明显;降水的年代际以及年际尺度的主要周期:年降水为12a、9a、5a,春季降水为14a、6a、3a,夏季为10a、4a,秋季为21a、10a、7a,冬季为18a、5a。年降水减少趋势明显,在1967年发生了突变,由相对多雨期转入相对少雨期;春季、夏季、秋季降水都有不同程度的减少趋势,而冬季降水则表现为增加的趋势。
Using the daily precipitation data （1955--2004） of 23 meteorological stations in Huaihai region, the periodic and abrupt changes of processes in recent 50 a are analyzed. The results show that precipitation has multi-time-scale features. The variations of precipitation periods and the phenomenon of transformation between dry and wet periods are obvious. The tests on periodic changes indicate that annual precipitation has 12,9 and 5 a period; spring precipitation has 14, 6 and 3 a period, summer precipitation has 10 and 4 a period; autumn precipitation has 21, 10 and 7 a period; winter precipitation has 18 and 5 a period. The decreasing trend of annual is obvious and the abrupt year was 1967. Spring, summer and autumn precipitation have descending trend in various degrees, but winter precipitation has increasing trend.
出处
《气象科学》
CSCD
北大核心
2010年第2期221-227,共7页
Journal of the Meteorological Sciences
基金
江苏省气象灾害重点实验室(KLME05017)
关键词
降水周期
气候突变
小波分析
Periodic precipitation Climate abrupt Wavelet Analysis
