气候变化领域集成服务门户(CCPortal): Global evapotranspiration over the past three decades: estimation based on the water balance equation combined with empirical models

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DOI	10.1088/1748-9326/7/1/014026
	Global evapotranspiration over the past three decades: estimation based on the water balance equation combined with empirical models
	Zeng, Zhenzhong; Piao, Shilong; Lin, Xin; Yin, Guodong; Peng, Shushi; Ciais, Philippe; Myneni, Ranga B.
通讯作者	Piao, SL (通讯作者)
发表日期	2012
ISSN	1748-9326
卷号	7 期号:1
英文摘要	We applied a land water mass balance equation over 59 major river basins during 2003-9 to estimate evapotranspiration (ET), using as input terrestrial water storage anomaly (TWSA) data from the GRACE satellites, precipitation and in situ runoff measurements. We found that the terrestrial water storage change cannot be neglected in the estimation of ET on an annual time step, especially in areas with relatively low ET values. We developed a spatial regression model of ET by integrating precipitation, temperature and satellite-derived normalized difference vegetation index (NDVI) data, and used this model to extrapolate the spatio-temporal patterns of changes in ET from 1982 to 2009. We found that the globally averaged land ET is about 604 mm yr(-1) with a range of 558-650 mm yr(-1). From 1982 to 2009, global land ET was found to increase at a rate of 1.10 mm yr(-2), with the Amazon regions and Southeast Asia showing the highest ET increasing trend. Further analyses, however, show that the increase in global land ET mainly occurred between the 1980s and the 1990s. The trend over the 2000s, its magnitude or even the sign of change substantially depended on the choice of the beginning year. This suggests a non-significant trend in global land ET over the last decade.
关键词	POTENTIAL EVAPOTRANSPIRATION DROUGHT GRACE CLIMATE
英文关键词	evapotranspiration; normalized difference vegetation index (NDVI); gravity recovery and climate experiment (GRACE) satellites; terrestrial water storage anomaly (TWSA)
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000302580600037
来源期刊	ENVIRONMENTAL RESEARCH LETTERS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258091
推荐引用方式 GB/T 7714	Zeng, Zhenzhong,Piao, Shilong,Lin, Xin,et al. Global evapotranspiration over the past three decades: estimation based on the water balance equation combined with empirical models[J]. 中国科学院青藏高原研究所,2012,7(1).
APA	Zeng, Zhenzhong.,Piao, Shilong.,Lin, Xin.,Yin, Guodong.,Peng, Shushi.,...&Myneni, Ranga B..(2012).Global evapotranspiration over the past three decades: estimation based on the water balance equation combined with empirical models.ENVIRONMENTAL RESEARCH LETTERS,7(1).
MLA	Zeng, Zhenzhong,et al."Global evapotranspiration over the past three decades: estimation based on the water balance equation combined with empirical models".ENVIRONMENTAL RESEARCH LETTERS 7.1(2012).