摘要
区域降水量不但是影响土壤风蚀的一个重要因素,同时还对植被及农牧业发展起着决定性的作用。以内蒙古寒旱区降水量为研究对象,在收集多年气象站观测数据的基础上,引入MHF小波函数,对其时间序列进行小波分析。揭示了区域降水量变化的多时间尺度的复杂结构,分析了其在不同时间尺度下的周期性和突变诊断点。研究表明:内蒙古寒旱区降水具有明显的季节性和阶段性特征,以1年和9年的周期振动最强;在整个时间域上,降水量呈减小趋势。
The study focused on the precipitation time series of past long years in dry - cold areas, Inner Mongolia, China, which is one of important factors influencing on wind erosion, vegetations, agricultural development. The MHF wavelet method was adopted to analyze the temporal - frequency multi - time scale variations and jumpfeatures of dust storm activities, which can reveal the multi - scale characteristics of dust storm. Gonsequently, the periods and turning points of precipitation in different time - scale were revealed. Meanwhile, the trend of rainfall in the following years was forecasted. The results showed that the precipitation showed obvious staggeredfeatures in dry - cold areas, Inner Mongolia, China. It was also found that approximate 1 - year and 9 - year pe- riod- oscillation was the strongest. In final the wavelet coefficients patterns exhibited a probablely decreasing trend in the following years.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2012年第4期113-116,共4页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金(10262001)
科技部重大基础前期研究专项(2002ccc03400)
内蒙古高等学校科学研究项目(NJzy08044)
内蒙古农业大学博士科研启动项目(BJ07-27)资助
关键词
降水
MHF小波
多时间尺度
寒旱区
precipitation
MHF wavelet method
multi - time scale
dry - cold areas
