近四百年北半球气温变化的分析:EMD方法的应用
EMD ANALYSIS OF NORTHERN HEMISPHERE TEMPERATURE VARIABILITY DURING LAST 4 CENTURIES
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摘要: 介绍了时间序列的经验模态分解(EMD)方法,将EMD方法应用于近400年北半球重建平均气温资料的分析,从气候时间序列中提取气候信号中各个尺度的变化,进而分析气候的周期性振荡在20世纪的20年代变暖、40年代变冷及70年代变暖的可能作用。Abstract: Empirical Mode Decomposition, a new time series analysis method, is introduced in this paper. Applying EMD to last 400 hundred reconstructed climate data of north hemisphere, different scale signal is separated. By analyzing the last 3 components of EMD results, we reach some conclusion about the role of climate periodic change on the 20 centuries climate change.
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Key words:
- empirical mode decomposition /
- climate variability /
- global warming
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