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Variation and Abrupt Change of Precipitation in Nyingchi Prefecture of Tibet Autonomous Region in Past 350 Years

LIU Xiao-hong+1, QIN Da-he+1, SHAO Xue-mei+2,ZHAO Liang-ju+1, CHEN Tuo+1, REN Jia-wen+1 (1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou Gansu 730000, China;2. Institute of Geographic Sciences and Nature Resources Research, Chinese Academy of Sciences, Beijing 100101, China)  
Reconstruction of autumn precipitation from stable carbon isotope series in Nyingchi Prefecture of Tibet Autonomous Region, together with the trend and phase analyses of past 350 years precipitations by method of wavelet, it is found that there are about 2~3 years, 13 years and 36 years cycles in precipitation series. The complex of precipitation period and abrupt change at different time-scale using the methods of wavelet and moving-t is analyzed. Finally the possibility due to abrupt climate change is discussed. The shorter the time-scale, the more abrupt change occurs.
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