Temperature Changes and their Driving Mechanism in Pan-Hexi Region
The Qilian Mountains located at the monsoon marginal zone, although the climate change frame in the region in recent thousand years has been reconstructed, different scholars have different studied conclusions as to the explanation of extreme climate events. Therefore, great efforts should be made to study the paleoclimate changes. The study selected wavelet and cross wavelet to reconstructed the time-scale oscillations of temperature changes in the Qilian Mountains and surrounding regions, the results showed that temperature were the periodical changes of 2-3 years, 30-50 years and 70-120 years; the “Little Ice Age” in the reconstructed temperature series corresponded to the intense energy development period of cosmic ray factors; the temperature variation periods at hundred-year scale corresponded to solar activity periods; large range of volcanic activities corresponded to the region’s temperature periodical changes of 120 years and 250 years but the influences of greenhouse gases and aerosols on temperature of the region were unclear. Atlantic multi-decadal oscillation and the region’s temperature changes from several decadal scales to several hundred-year scales showed a better consistence and resonant period. Sea surface temperature and winter North Atlantic oscillation index and the region’s temperature series showed a significant resonant period at hundred-year scale. The past climate and environmental evolution and possible formation mechanism in Qilian and surrounding regions, have a very important significance to predict future climate changes and runoff into the upper reaches of inland rivers.
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