Decrease in snowfall/rainfall ratio in the Tibetan Plateau from 1961 to 2013 |
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| Authors: | Jie Wang Mingjun Zhang Shengjie Wang Zhengguo Ren Yanjun Che Fang Qiang Deye Qu |
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| Institution: | 1.College of Geography and Environmental Science,Northwest Normal University,Lanzhou,China |
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| Abstract: | On the basis of two gridded datasets of daily precipitation and temperature with a spatial resolution of 0.5°×0.5°, and meteorological station data released by the National Meteorological Information Center (NMIC) during 1961–2013, the spatial and temporal variations of total amount of precipitation, amount of rainfall, amount of snowfall and snowfall/rainfall ratio (S/R) in the Tibetan Plateau (TP) are analyzed using Sen’s slope, the Mann–Kendall mutation test, Inverse Distance Weighting (IDW) and the Morlet wavelet. Total amount of precipitation and amount of rainfall generally show statistically significant increasing trends of 0.6 mm·a–1 and 1.3 mm·a–1, respectively, while amount of snowfall and S/R have significant decreasing trends of–0.6 mm·a–1 and–0.5% a–1, respectively. In most regions, due to significant increasing trends in total amount of precipitation and amount of rainfall, and significant decreasing trends in amount of snowfall, S/R shows a decreasing trend in the TP. Abrupt changes in total amount of precipitation, amount of rainfall, amount of snowfall and S/R are detected for 2005, 2004, 1996 and 1998, respectively. Total amount of precipitation, amount of rainfall, amount of snowfall and S/R are concentrated in cycles of approximately 5 years, 10 years, 16 years and 20 years, respectively. The trend magnitudes for total amount of precipitation and amount of rainfall all show decreasing-to-increasing trends with elevation, while amount of snowfall and S/R show decreasing trends. |
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