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《Acta Geographica Sinica》 2016-01
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Change of snowfall/rainfall ratio in the Tibetan Plateau based on a gridded dataset with high resolution during 1961-2013

WANG Jie;ZHANG Mingjun;WANG Shengjie;REN Zhengguo;CHE Yanjun;ZHANG Fuxian;College of Geography and Environmental Science, Northwest Normal University;  
Based on the daily precipitation and temperature from a 0.5° × 0.5° gridded dataset and meteorological stations during 1961- 2013 released by the National Meteorological Information Center, the spatial and temporal changes of annual precipitation, rainfall, snowfall and snowfall/rainfall ratio(S/R) in the Tibetan Plateau in recent 53 years were analyzed by using Sen slope, Mann- Kendall mutation test, IDW(inverse distance- weighted) interpolation and Morlet wavelet. The results indicated that:(1) Generally, precipitation and rainfall show increasing trends by 0.6 mm · a~(-1)(p 0.05) and 1.3 mm · a~(-1)(p 0.001), respectively, while snowfall and S/R show decreasing trends by 0.6 mm·a~(-1)(p 0.01) and 0.5%·a~(-1)(p 0.001),respectively.(2) Precipitation and rainfall show increasing trends, but snowfall shows a decreasing trend in most parts of the Tibetan Plateau. On this basis, S/R shows a decreasing trend.(3) Abrupt and cycle analysis shows that the abrupt changes of the precipitation, rainfall,snowfall and S/R occurred in 2005, 2004, 1996 and 1998, respectively. The precipitation,rainfall, snowfall and S/R present cycles of approximately 5 years, 10 years, 16 years and 20 years, respectively.(4) As elevation increases, the trend magnitude for precipitation and rainfall shows a decrease-to-increase trend, and that for snowfall and S/R shows a decreasing trend.
【Fund】: 全球变化国家重大科学研究计划项目(2013CBA01801);; 国家自然科学基金项目(41461003 41161012)~~
【CateGory Index】: P426.63
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