干旱区生态环境知识资源中心(Arid): Evaluating the accuracy of satellite-derived evapotranspiration estimates acquired during conditions of water stress

Arid

DOI	10.1080/01431161.2019.1646940
	Evaluating the accuracy of satellite-derived evapotranspiration estimates acquired during conditions of water stress
	Gokool, S.1; Riddell, Es 1,2; Jarmain, C.3; Chetty, Kt 1; Feig, G.4; Thenga, H.5
通讯作者	Gokool, S.
来源期刊	INTERNATIONAL JOURNAL OF REMOTE SENSING
ISSN	0143-1161
EISSN	1366-5901
出版年	2020
卷号	41 期号:2 页码:704-724
英文摘要	Surface energy balance models such as the surface energy balance system (SEBS) assume that the influence of soil moisture and biophysical parameters on evapotranspiration (ET), are implicitly encompassed in model input variables such as the land surface temperature. This simplification may generally be suitable for environments in which the available energy constrains ET but may prove to be inadequate during suboptimal environmental conditions. To address this limitation, the SEBSESF approach was proposed to better represent the influence of environmental stress on surface energy fluxes, using an empirically derived calibration factor to adjust the evaporative fraction previously determined in SEBS. SEBSESF was evaluated by comparing the modelled ET estimates against Eddy Covariance ET measurements (ECET) at two sites, with contrasting environmental conditions. Comparisons between ECET and modelled ET indicated that the implementation of SEBSESF resulted in an improved correlation between ECET and modelled ET estimates, as well as an increase in the percentage of modelled ET estimates within an acceptable accuracy range (+/- 15 to 30%). Overall, the results of the study demonstrate how potential improvements in the mapping of ET within arid and semi-arid environments can be achieved by accounting for environmental stress. This in turn provides an opportunity to better understand and quantify energy and water fluxes, using satellite-based ET estimation approaches.
类型	Article
语种	英语
国家	South Africa
收录类别	SCI-E
WOS记录号	WOS:000479347600001
WOS关键词	BALANCE SYSTEM SEBS ; ENERGY-BALANCE ; SOIL-MOISTURE ; EVAPORATION ; INTEGRATION ; VALIDATION ; RADIATION ; LETABA ; MODEL ; LAND
WOS类目	Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向	Remote Sensing ; Imaging Science & Photographic Technology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/219386
作者单位	1.Univ KwaZulu Natal, Sch Agr Earth & Environm Sci, CWRR, Pietermaritzburg, South Africa; 2.South African Natl Pk, Conservat Management, Skukuza, South Africa; 3.Univ Stellenbosch, Stellenbosch, South Africa; 4.EFTEON, Pretoria, South Africa; 5.CSIR, Nat Resources & Environm, Pretoria, South Africa
推荐引用方式 GB/T 7714	Gokool, S.,Riddell, Es,Jarmain, C.,et al. Evaluating the accuracy of satellite-derived evapotranspiration estimates acquired during conditions of water stress[J],2020,41(2):704-724.
APA	Gokool, S.,Riddell, Es,Jarmain, C.,Chetty, Kt,Feig, G.,&Thenga, H..(2020).Evaluating the accuracy of satellite-derived evapotranspiration estimates acquired during conditions of water stress.INTERNATIONAL JOURNAL OF REMOTE SENSING,41(2),704-724.
MLA	Gokool, S.,et al."Evaluating the accuracy of satellite-derived evapotranspiration estimates acquired during conditions of water stress".INTERNATIONAL JOURNAL OF REMOTE SENSING 41.2(2020):704-724.