气候变化领域集成服务门户(CCPortal): Partitioning global land evapotranspiration using CMIP5 models constrained by observations

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DOI	10.1038/s41558-018-0207-9
	Partitioning global land evapotranspiration using CMIP5 models constrained by observations
	Lian, Xu; Piao, Shilong; Huntingford, Chris; Li, Yue; Zeng, Zhenzhong; Wang, Xuhui; Ciais, Philippe; McVicar, Tim R.; Peng, Shushi; Ottle, Catherine; Yang, Hui; Yang, Yuting; Zhang, Yongqiang; Wang, Tao
通讯作者	Piao, SL (通讯作者)
发表日期	2018
ISSN	1758-678X
EISSN	1758-6798
起始页码	640
结束页码	+
卷号	8 期号:7
英文摘要	The ratio of plant transpiration to total terrestrial evapotranspiration (T/ET) captures the role of vegetation in surface-atmosphere interactions. However, its magnitude remains highly uncertain at the global scale. Here we apply an emergent constraint approach that integrates CMIP5 Earth system models (ESMs) with 33 field T/ET measurements to re-estimate the global T/ET value. Our observational constraint strongly increases the original ESM estimates (0.41 +/- 0.11) and greatly alleviates intermodel discrepancy, which leads to a new global T/ET estimate of 0.62 +/- 0.06. For all the ESMs, the leaf area index is identified as the primary driver of spatial variations of T/ET, but to correct its bias generates a larger T/ET underestimation than the original ESM output. We present evidence that the ESM underestimation of T/ET is, instead, attributable to inaccurate representation of canopy light use, interception loss and root water uptake processes in the ESMs. These processes should be prioritized to reduce model uncertainties in the global hydrological cycle.
关键词	CLIMATE IMPACTS WATER TRANSPIRATION CARBON PLANT VEGETATION FOREST EVAPORATION RADIATION TRENDS
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Environmental Studies ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000440200100026
来源期刊	NATURE CLIMATE CHANGE
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/259366
推荐引用方式 GB/T 7714	Lian, Xu,Piao, Shilong,Huntingford, Chris,et al. Partitioning global land evapotranspiration using CMIP5 models constrained by observations[J]. 中国科学院青藏高原研究所,2018,8(7).
APA	Lian, Xu.,Piao, Shilong.,Huntingford, Chris.,Li, Yue.,Zeng, Zhenzhong.,...&Wang, Tao.(2018).Partitioning global land evapotranspiration using CMIP5 models constrained by observations.NATURE CLIMATE CHANGE,8(7).
MLA	Lian, Xu,et al."Partitioning global land evapotranspiration using CMIP5 models constrained by observations".NATURE CLIMATE CHANGE 8.7(2018).