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Trends in Applied Sciences Research
Year: 2006  |  Volume: 1  |  Issue: 6  |  Page No.: 620 - 626

Trend of Dropping in Temperature Over Global Climate

Xian Sun and Zhen-Shan Lin    

Abstract: A novel multi-timescale analysis method, Empirical Mode Decomposition (EMD), is used to diagnose the variation of the annual mean temperature data of the global, China from 1881 to 2002. The results show that it contains four timescales quasi-periodic oscillations, 3 year and 6 year on interannual scales, interdecadal scales involving 20 year and 60 year and a trend, respectively. And the contributions of CO2 concentration to global temperature change is embodied by the trend signal, its influencing weight is not more than 40.19%, smaller than that of the rest four timescales climate natural variability in IMF1, IMF2, IMF3 and IMF4 (3, 6, 20 and 60 year, respectively). Though the increasing trend in atmospheric CO2 concentration, the modes of IMF2, IMF3 and IMF4 of global temperature are all in falling. Hence if maintains CO2 concentration constant at present, well then the radiation forcing of greenhouse warming is deficient to countercheck the natural change in global climate cooling in the future 20 years. In quasi 60 year timescales, abrupt temperature changes of China precede global temperature change, which provides a denotation for global climate change.

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