气候变化领域集成服务门户(CCPortal): A worldwide analysis of spatiotemporal changes in water balance-based evapotranspiration from 1982 to 2009

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DOI	10.1002/2013JD020941
	A worldwide analysis of spatiotemporal changes in water balance-based evapotranspiration from 1982 to 2009
	Zeng, Zhenzhong; Wang, Tao; Zhou, Feng; Ciais, Philippe; Mao, Jiafu; Shi, Xiaoying; Piao, Shilong
通讯作者	Piao, SL (通讯作者)
发表日期	2014
ISSN	2169-897X
EISSN	2169-8996
起始页码	1186
结束页码	1202
卷号	119 期号:3
英文摘要	A satellite-based water balance method is developed to model global evapotranspiration (ET) through coupling a water balance (WB) model with a machine-learning algorithm (the model tree ensemble, MTE) (hereafter WB-MTE). The WB-MTE algorithm was firstly trained by combining monthly WB-estimated basin ET with the potential drivers (e.g., radiation, temperature, precipitation, wind speed, and vegetation index) across 95 large river basins (5824 basin-months) and then applied to establish global monthly ET maps at a spatial resolution of 0.5 degrees from 1982 to 2009. The global land ET estimated from WB-MTE has an annual mean of 59317mm for 1982-2009, with a spatial distribution consistent with previous studies in all latitudes but the tropics. The ET estimated by WB-MTE also shows significant linear trends in both annual and seasonal global ET during 1982-2009, though the trends seem to have stalled after 1998. Moreover, our study presents a striking difference from the previous ones primarily in the magnitude of ET estimates during the wet season particularly in the tropics, where ET is highly uncertain due to lack of direct measurements. This may be tied to their lack of proper consideration to solar radiation and/or the rainfall interception process. By contrast, in the dry season, our estimate of ET compares well with the previous ones, both for the mean state and the variability. If we are to reduce the uncertainties in estimating ET, these results emphasize the necessity of deploying more observations during the wet season, particularly in the tropics.
关键词	TROPICAL RAIN-FOREST SOIL-MOISTURE SURFACE-TEMPERATURE GLOBAL ENERGY EVAPORATION PRECIPITATION TRENDS MODEL VARIABILITY FLUXNET
英文关键词	evapotranspiration; water balance
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000332994600006
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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/258399
推荐引用方式 GB/T 7714	Zeng, Zhenzhong,Wang, Tao,Zhou, Feng,et al. A worldwide analysis of spatiotemporal changes in water balance-based evapotranspiration from 1982 to 2009[J]. 中国科学院青藏高原研究所,2014,119(3).
APA	Zeng, Zhenzhong.,Wang, Tao.,Zhou, Feng.,Ciais, Philippe.,Mao, Jiafu.,...&Piao, Shilong.(2014).A worldwide analysis of spatiotemporal changes in water balance-based evapotranspiration from 1982 to 2009.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,119(3).
MLA	Zeng, Zhenzhong,et al."A worldwide analysis of spatiotemporal changes in water balance-based evapotranspiration from 1982 to 2009".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 119.3(2014).