摘要
根据黄土高原中部1981—2008年的58个观测站的月降雨量资料进行趋势变化及季节分配特征分析,结果表明,黄土高原中部年均降雨量在空间上呈现明显的梯度变化,从东南部向西北部逐渐减少,中部降雨量多年来持平.四季降雨量均在减少且平均降雨量变化存在明显的季节性差异,其中夏季降雨量减少趋势最明显,整体呈现下降趋势,干旱化趋势十分明显.应用小波分析,看出黄土高原中部降雨量具有2～3和7 a左右的年际振荡,其中以2～3 a的年际振荡尤为明显.
Through the trend changes and seasonal distributions of characteristics analysis of monthly rainfall data about 58 stations in the middle of the Loess Plateau from 1981 to 2008,a conclusion could be obtained that in the middle of the Loess Plateau,average annual rainfall in space showed a clear gradient,and gradually reduced from southeast to northwest,but the rainfall in central area kept stable for years.The rainfall of four seasons was reducing and the average rainfall changes were obvious seasonal differences.Especially in summer,it presented obvious decreasing trend and the drought trend was extremely visible.The results of wavelet analysis showed that the rainfall in the middle of the Loess Plateau had oscillations of 2~3 and 7 years,particularly in 2~3 years.
出处
《四川师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第5期724-728,共5页
Journal of Sichuan Normal University（Natural Science）
基金
2011年中国气象局预报员专项基金(CMAYBY2011-054)资助项目
关键词
降雨量
趋势变化
统计特征
rainfall
trend change
statistical characteristics
