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Fractal Research on Changing Trends of Precipitation and Rain Day in Tibetan Plateau

FENG Zi-li et al (College of Air Traffic Management,Civil Aviation Flight University of China,Guanghan,Sichuan 618307)  
The fractal research on annual precipitations and annual rain days of 12 meteorological stations such as Lhasa,Tuotuo River and Ganzi etc.in Tibetan plateau were conducted by R/S analysis.The results showed that the total change trends of annual precipitation and annual rain day had very obvious Hurst phenomena,and the long-term correlation characteristic between time sequences of annual precipitation and annual rain day showed to be durative on the whole.The change trends of annual precipitation included not only decreasing trend but also increasing trend,the change of annual rain day showed to be completely "unified" significant decreasing trend,and the long-term change trends of annual rain day and annual precipitation were not completely accordant.
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