更新时间:04-17 上传会员:白色球鞋
分类:农业大学 论文字数:6799 需要金币:1000个
摘要:以塔里木河流域为例,基于1959-2006年的时间序列,运用小波分析方法从不同的时间尺度上分析了年平均气温的非线性变化趋势,主要结论如下:从时间尺度16年(S4)及8年(S3)上来看,以1980年为时间节点,1980年以前,塔里木河流域年平均气温有微弱上升趋势,1980年以后,流域年平均气温明显上升,上升幅度1.0℃-2.0℃。如果把时间尺度缩小到S2上来看,那么,年平均气温在总体上仍然保持了S4、S3尺度的基本趋势,但是出现了比较明显的起伏振荡,以1993年为时间节点,1993年以前,年平均气温的变化以波动性为主,在波动中呈微弱上升趋势,1993年以后,年平均气温的变化以上升趋势为主,在上升过程中有微弱波动。本文从气候系统具有多时空尺度、多层次结构和分形特征的角度出发,应用小波分析方法分析研究塔里木河流域1959年-2006年48年气候时间序列数据,以期能够揭示该区域气温的非线性特征。
关键词:年平均气温;小波分析;非线性;塔里木河流域
Abstract: In the Tarim Basin, based on 1959-2006 annual time series using wavelet analysis from different time scales analysis of nonlinear changes in annual mean temperature trends, the main conclusions are as follows: from the large time scales, from the time S4 and S3-scale point of view, for the time nodes 1980, before 1980, the average temperature in the Tarim Basin has a weak upward trend since 1980, annual temperature has increased significantly, rising rate of 1.0℃~2.0℃. If the time scale down to the point of view S2, then the overall annual average temperature is still maintained in the S4, S3-scale basic trend, but there has been a significant fluctuation oscillations, the time nodes 1993, before 1993, the annual The mean temperature of the volatility mainly in fluctuations in the weakly increasing trend since 1993, the annual average temperature change to an upward trend, mainly in the course of a slight increase in volatility.
Keywords: Annual Mean Temperature; Wavelet Analysis; Nonlinear; Tarim Basin