Decrease in snowfall/rainfall ratio in the Tibetan Plateau from 1961 to 2013  

1961-2013年青藏高原雪雨比变化（英文）

作　　者：王杰 张明军 王圣杰 任正果 车彦军 强芳 瞿德业 

机构地区：[1]College of Geography and Environmental Science, Northwest Normal University

出　　处：《Journal of Geographical Sciences》2016年第9期1277-1288,共12页地理学报（英文版）

基　　金：National Basic Research Program of China(973 Program),No.2013CBA01801;National Natural Science Foundation of China,No.41461003,No.41161012

摘　　要：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 SIR 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, SIR 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 SIR 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 SIR show decreasing trends.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 SIR 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, SIR 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 SIR 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 SIR show decreasing trends.

关 键 词：Tibetan Plateau gridded data snowfall/rainfaU ratio PRECIPITATION 

分 类 号：P426.6[天文地球—大气科学及气象学]