基于高分辨率格点数据的1961-2013年青藏高原雪雨比变化

doi:10.11821/dlxb201601011

Abstract

Abstract:

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.

Key words: Tibetan Plateau, gridded dataset, snowfall/rainfall ratio, trend

WANG Jie,ZHANG Mingjun,WANG Shengjie,REN Zhengguo,CHE Yanjun,ZHANG Fuxian. Change of snowfall/rainfall ratio in the Tibetan Plateau based on a gridded dataset with high resolution during 1961-2013[J].Acta Geographica Sinica, 2016, 71(1): 142-152.

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	倾向率变化区间(mm·a^-1或a^-1)	格点的百分率(%)
	倾向率变化区间(mm·a^-1或a^-1)	正趋势	显著正趋势	负趋势	显著负趋势
降水量	-12.1~14.1	76.9	45.1	23.1	20.9
降雨量	-4.6~14.0	87.2	65.1	12.8	14.9
降雪量	-12.1~3.3	25.2	13.6	74.8	41.8
雪雨比	-6.2~13.1	8.6	10.5	91.4	59.1

	突变年份	突变前均值	突变后均值	突变后与突变前数值差
降水量(mm)	2005	433.4	469.3	35.9
降雨量(mm)	2004	266.4	318.8	52.4
降雪量(mm)	1996	172.1	151.8	-20.3
雪雨比(%)	1998	70	50	-20

Change of snowfall/rainfall ratio in the Tibetan Plateau based on a gridded dataset with high resolution during 1961-2013

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