气候变化领域集成服务门户(CCPortal): Observed changes in snow depth and number of snow days in the eastern and central Tibetan Plateau

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DOI	10.3354/cr00985
	Observed changes in snow depth and number of snow days in the eastern and central Tibetan Plateau
	You, Qinglong; Kang, Shichang; Ren, Guoyu; Fraedrich, Klaus; Pepin, Nick; Yan, Yuping; Ma, Lijuan
发表日期	2011
ISSN	0936-577X
EISSN	1616-1572
卷号	46 期号:2
英文摘要	The Tibetan Plateau (TP) has the largest area of snow in the mid-latitude regions, and is strongly affected by the climate change. We examine the temporal variability of winter snow depth and number of days of snow cover at 69 Chinese Meteorological Administration stations above 2000 m a.s.l. in the eastern and central TP during 1961-2005. Snow depth is positively correlated with the number of snow days (R = 0.89, p < 0.0001). Regional mean winter (DJF) depth and days of snow cover increase at rates of 0.32 mm decade(-1) and 0.40 d decade(-1) from 1961 to 1990, but at rates of -1.80 mm decade(-1) and -1.59 d decade(-1) (i.e. decrease) between 1991 and 2005. The long term trends are weakly positive, but unrepresentative of shorter time periods. Thus snow depth and cover change depends on the timescale examined and cannot be attributed solely to increased greenhouse gas forcing. The decreasing snow depth in recent years will influence hydrological processes and water resources on the plateau and downstream. Both snow depth and duration have positive correlations with the winter Arctic Oscillation/North Atlantic Oscillation (AO/NAO) index and Nino-3 region (5 degrees N-5 S, 150 degrees-90 degrees W) sea surface temperature (SST). During high AO/NAO index years, both a deeper India-Burma trough and an intensified cyclonic circulation near Lake Baikal bring more snowfall to the TP, consistent with a higher water vapor flux. The opposite is true in low AO/NAO years. Thus secular changes of snow depth and duration in the TP are not independent of changes in the macro-scale atmospheric circulation.
关键词	Snow depth Snow days Tibetan Plateau Arctic Oscillation North Atlantic Oscillation
学科领域	Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences ; Meteorology & Atmospheric Sciences
来源期刊	CLIMATE RESEARCH
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/111619
作者单位	Chinese Acad Sci, Lab Tibetan Environm Changes & Land Surface Proc, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China
推荐引用方式 GB/T 7714	You, Qinglong,Kang, Shichang,Ren, Guoyu,et al. Observed changes in snow depth and number of snow days in the eastern and central Tibetan Plateau[J]. 中国科学院西北生态环境资源研究院,2011,46(2).
APA	You, Qinglong.,Kang, Shichang.,Ren, Guoyu.,Fraedrich, Klaus.,Pepin, Nick.,...&Ma, Lijuan.(2011).Observed changes in snow depth and number of snow days in the eastern and central Tibetan Plateau.CLIMATE RESEARCH,46(2).
MLA	You, Qinglong,et al."Observed changes in snow depth and number of snow days in the eastern and central Tibetan Plateau".CLIMATE RESEARCH 46.2(2011).