气候变化领域集成服务门户(CCPortal): Spatial and temporal trend of potential evapotranspiration and related driving forces in Southwestern China, during 1961-2009

CCPortal

DOI	10.1016/j.quaint.2013.12.045
	Spatial and temporal trend of potential evapotranspiration and related driving forces in Southwestern China, during 1961-2009
	Li Zongxing; Feng Qi; Wei, Liu; Wang Tingting; Gao Yan; Wang Yamin; Cheng Aifang; Li Jianguo; Liu Li
发表日期	2014
ISSN	1040-6182
EISSN	1873-4553
卷号	336
英文摘要	Potential evapotranspiration (ETo) is an integral component of the hydrological cycle and the global energy balance, and its long-term variation is of much concern in climate change studies. Trends of temporal and spatial patterns in potential evapotranspiration and related driving factors over southwestern China are evaluated for the period 1961-2009, based on data from 111 standard meteorological stations. The results showed that southwestern China is experiencing a statistical decrease of ETo at a rate of 5.0 mm/10 y during 1961-2009. This decrease mainly started in the 1980s when accelerated warming occurred, which reflected the existence of the "evaporation paradox". However, autumn ETo showed a similar inter-annual variation with temperature rise. In spatial characteristics, the statistically significant decrease of ETo mainly occurred in the lower altitude region, whereas stations with increases or non-significant decreases are mainly in higher altitude regions. Through the analysis, the driving factors are the following: (1) the decreased wind speed is the main driving force for ETo decrease because the higher saturated vapor pressure would restrain evaporation owing to the weak water vapor exchange under lower wind speed. (2) Increased sunshine hours lead to stronger evaporation. This influence mainly occurred in the Xizang plateau-Hengduan Mountains and Yunnan-Guizhou plateau. (3) The weakly increased precipitation is also linked to the decreased ETo because the precipitation increase will cancel the partially increased ETo. (4) The decreased relative humidity would cause a corresponding decline of saturated vapor pressure, which must lead to the rise of ETo. (5) Climate warming is not the crucial driving factor for ETo inter-annual variation, but the accelerated warming had some influence on summer and autumn ETo, especially during the period of 1991-2009. In addition, the topography also had some influence. Thus, variation is dominated by the comprehensive functions of multi-factors, owing to the complex nature of ETo. (C) 2013 Elsevier Ltd and INQUA. All rights reserved.
学科领域	Physical Geography; Geology
语种	英语
WOS研究方向	Geography, Physical ; Geosciences, Multidisciplinary
来源期刊	QUATERNARY INTERNATIONAL
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/111749
作者单位	Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Gansu Hydrol & Water Resources Engn Res Ctr, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Li Zongxing,Feng Qi,Wei, Liu,et al. Spatial and temporal trend of potential evapotranspiration and related driving forces in Southwestern China, during 1961-2009[J]. 中国科学院西北生态环境资源研究院,2014,336.
APA	Li Zongxing.,Feng Qi.,Wei, Liu.,Wang Tingting.,Gao Yan.,...&Liu Li.(2014).Spatial and temporal trend of potential evapotranspiration and related driving forces in Southwestern China, during 1961-2009.QUATERNARY INTERNATIONAL,336.
MLA	Li Zongxing,et al."Spatial and temporal trend of potential evapotranspiration and related driving forces in Southwestern China, during 1961-2009".QUATERNARY INTERNATIONAL 336(2014).