摘要
采用东北地区99个测站1960～2000年逐日降水资料,运用小波分析、突变分析、旋转EOF等方法,研究了东北地区不同区域夏季降水的长期变化特征。结果表明,东北地区夏季降水呈减少趋势,并存在14年和2～4年的变化周期。东北地区夏季降水异常可分为5种空间分布类型:东北西南部型、东北东南部型,东北东北部型、东北西北部型、东北中部型。东北东南部地区夏季降水减少趋势最明显,东北西南部降水的增加趋势最明显。各区域降水的变化周期有所区别,东北东北部存在16～18年的变化周期,其它地区存在10～14年的变化周期,各区域降水突变的时间主要在60年代和80年代。
Summer precipitation data in Northeast China from 1960 to 2000 was used to study the temporal and spatial features of summer rainfall. The results show that summer rainfall in Northeast China exhibited a downward trend with variation periods of 14 years and 2 to 4 years. Two abrupt summer rainfall changes occurred in 1964 and 1988/1989. The variations of summer precipitation in Northeast China can be divided into 5 types: southwest, southeast, northeast, northwest, and central Northeast China. Difference variation tendencies were found in different areas. Rainfall significantly decreased in the southeast of Northeast China and increased in the southwest of Northeast China. Meanwhile, the precipitation over different areas exhibited different periods and different occurring time of abrupt change. There is a 16-18 year cycle period in rainfall variation in the northeast of Northeast China and a 10-14 year period over the others areas. The abrupt changes took place in the 1960's and 1980's.
出处
《气象科技》
2005年第2期136-141,共6页
Meteorological Science and Technology
基金
江苏省"青蓝工程"基金项目资助
