气候变化领域集成服务门户(CCPortal): Emergent Simplicity of Continental Evapotranspiration

CCPortal

DOI	10.1029/2020GL087101
	Emergent Simplicity of Continental Evapotranspiration
	McColl K.A.; Rigden A.J.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:6
英文摘要	Evapotranspiration (ET) is challenging to model because it depends on heterogeneous land surface features—such as soil moisture, land cover type, and plant physiology—resulting in rising model complexity and substantial disagreement between models. We show that the evaporative fraction (ET as a proportion of available energy at the surface) can be estimated accurately across a broad range of conditions using a simple equation with no free parameters and no land surface information; only near-surface air temperature and specific humidity observations are required. The equation performs well when compared to eddy covariance measurements at 76 inland continental sites, with prediction errors comparable to errors in the eddy covariance measurements themselves, despite substantial variability in surface conditions across sites. This reveals an emergent simplicity to continental ET that has not been previously recognized, in which land-atmosphere coupling efficiently embeds land surface information in the near-surface atmospheric state on daily to monthly time scales. ©2020. The Authors.
英文关键词	Atmospheric humidity; Soil moisture; Surface measurement; Hydrometeorology; Land atmosphere interaction; Land-atmosphere couplings; Surface flux; Water stress; Evapotranspiration; air temperature; eddy covariance; evapotranspiration; hydrometeorology; land-atmosphere interaction; soil moisture; surface flux; water stress
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170537
作者单位	Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, United States
推荐引用方式 GB/T 7714	McColl K.A.,Rigden A.J.. Emergent Simplicity of Continental Evapotranspiration[J],2020,47(6).
APA	McColl K.A.,&Rigden A.J..(2020).Emergent Simplicity of Continental Evapotranspiration.Geophysical Research Letters,47(6).
MLA	McColl K.A.,et al."Emergent Simplicity of Continental Evapotranspiration".Geophysical Research Letters 47.6(2020).