干旱区生态环境知识资源中心(Arid): A non-parametric method combined with surface flux equilibrium for estimating terrestrial evapotranspiration: Validation at eddy covariance sites

Arid

DOI	10.1016/j.jhydrol.2024.130682
	A non-parametric method combined with surface flux equilibrium for estimating terrestrial evapotranspiration: Validation at eddy covariance sites
	Pan, Xin; Yang, Zi; Liu, Yuanbo; Yuan, Jie; Wang, Zhanchuan; Liu, Suyi; Yang, Yingbao
通讯作者	Yang, YB
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2024
卷号	631
英文摘要	Developing suitable evapotranspiration (ET) methods for different water supply conditions is a major challenge. As a diagnostic approach, the non-parametric (NP) method avoids the parameterization of resistances, while having the advantages of clear physical mechanisms and simple input data. However, the applicability of the NP method in arid areas, especially at short temporal scales, is controversial. To address this problem, a type of equilibrium ET estimation method, surface flux equilibrium (SFE), was introduced into the NP method to obtain a new approach for estimating ET: the proposed SFE-NP. The accuracy of the SFE-NP method was validated based on 30 globally distributed FLUXNET2015 eddy covariance tower sites, and its applicability and sensitivity were analyzed. Results demonstrate that the performance of the SFE-NP method in arid areas is satisfactory, involving a significant reduction of the ET estimation error of more than 24.00 % (relative error: 32.31 %; bias: 10.17 W/ m2) compared with the Priestley-Taylor (PT), NP and Surface Flux Equilibrium (SFE) methods. And the accuracy of SFE-NP method is similar to that of Surface Flux Equilibrium Maximum Entropy Production (SFE-MEP) method in the arid areas. Furthermore, in non-arid areas, the accuracy of the SFE-NP method (relative error: 14.45 %) was better than that of the PT method and similar to that of the NP, SFE and SFE-MEP method. The SFENP method should be used at the daily scale or longer. The ET derived by the SFE-NP method introduced more errors at the hourly scale (increased error: 12.15 W/m2) than at the daily scale. Air temperature and land surface temperature were the most sensitive parameters in the SFE-NP method, particularly in arid areas, with their sensitivities under arid conditions being twice as high as those under humid conditions. The SFE-NP method can satisfy the requirements for ET retrieval under different underlying surfaces and water supply conditions, and provides a simple but efficient method for high-precision ET estimation.
英文关键词	Evapotranspiration Relative humidity Non-parametric method Accuracy assessment Sensitivity analysis
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001177263400001
WOS关键词	GLOBAL EVAPOTRANSPIRATION ; SPATIAL VARIABILITY ; ENERGY-BALANCE ; RECENT DECLINE ; HEAT-FLUX ; EVAPORATION ; HUMIDITY ; WATER ; MODEL ; VAPOR
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404551
推荐引用方式 GB/T 7714	Pan, Xin,Yang, Zi,Liu, Yuanbo,et al. A non-parametric method combined with surface flux equilibrium for estimating terrestrial evapotranspiration: Validation at eddy covariance sites[J],2024,631.
APA	Pan, Xin.,Yang, Zi.,Liu, Yuanbo.,Yuan, Jie.,Wang, Zhanchuan.,...&Yang, Yingbao.(2024).A non-parametric method combined with surface flux equilibrium for estimating terrestrial evapotranspiration: Validation at eddy covariance sites.JOURNAL OF HYDROLOGY,631.
MLA	Pan, Xin,et al."A non-parametric method combined with surface flux equilibrium for estimating terrestrial evapotranspiration: Validation at eddy covariance sites".JOURNAL OF HYDROLOGY 631(2024).