气候变化领域集成服务门户(CCPortal): Micrometeorological measurements in an arid environment: Diurnal characteristics and surface energy balance closure

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DOI	10.1016/j.atmosres.2019.104745
	Micrometeorological measurements in an arid environment: Diurnal characteristics and surface energy balance closure
	Nelli N.R.; Temimi M.; Fonseca R.M.; Weston M.J.; Thota M.S.; Valappil V.K.; Branch O.; Wizemann H.-D.; Wulfmeyer V.; Wehbe Y.
发表日期	2020
ISSN	0169-8095
卷号	234
英文摘要	The goal of this study is to assess the surface energy balance closure (SEBC) in an arid environment through a comprehensive analysis of surface radiation, heat fluxes, and other micrometeorological measurements. These were taken from a 2.3-m eddy covariance (EC) flux tower at Al Ain (24°16′26.5535″ N, 55°37′03.2196″ E; 243 m a.m.s.l.) during the periods April – October 2017 and February 2018 – January 2019. The SEBC is investigated on seasonal and diurnal time-scales using the Energy Balance Ratio (EBR) and residual flux (ΔE) values. An analyses of the SEBC reveals that during daytime a three-way balance between the sensible heat, ground heat fluxes and the net surface radiative flux prevails, while at night the last two essentially balance each other. These fluxes are roughly 25% larger in the summer compared to the winter season. The surface downward shortwave radiation flux and latent heat flux peak in spring, despite the latter having rather small magnitudes (<20 W m−2) throughout the year. The EBR during daytime is in the range 0.60 to 0.75. The mean ΔE during daytime (nighttime) is 30 W m−2 (−14 W m−2) respectively. Further analysis of the SEBC with respect to the prevailing wind direction revealed that the maximum closure is observed for north-northwesterly winds and the minimum for southerly winds. This may be explained by the surface heterogeneity and the presence of a building to the south of the site. The SEBC is better for daytime and for periods when the friction velocity is higher. © 2019 Elsevier B.V.
英文关键词	Arid environment; Eddy covariance technique; Friction velocity; Micrometeorological measurements; Soil temperature; Surface energy balance closure
学科领域	Energy balance; Friction; Interfacial energy; Arid environments; Eddy covariance technique; Friction velocity; Micrometeorological measurements; Soil temperature; Heat flux; arid environment; boundary layer; eddy covariance; energy balance; friction; latent heat flux; micrometeorology; shortwave radiation; soil temperature; surface energy
语种	英语
scopus关键词	Energy balance; Friction; Interfacial energy; Arid environments; Eddy covariance technique; Friction velocity; Micrometeorological measurements; Soil temperature; Heat flux; arid environment; boundary layer; eddy covariance; energy balance; friction; latent heat flux; micrometeorology; shortwave radiation; soil temperature; surface energy
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120518
作者单位	Khalifa University of Science and Technology, P.O. Box 54224, Abu Dhabi, United Arab Emirates; Institute of Physics and Meteorology, University of Hohenheim, Germany; National Center of Meteorology, Abu Dhabi, United Arab Emirates
推荐引用方式 GB/T 7714	Nelli N.R.,Temimi M.,Fonseca R.M.,et al. Micrometeorological measurements in an arid environment: Diurnal characteristics and surface energy balance closure[J],2020,234.
APA	Nelli N.R..,Temimi M..,Fonseca R.M..,Weston M.J..,Thota M.S..,...&Wehbe Y..(2020).Micrometeorological measurements in an arid environment: Diurnal characteristics and surface energy balance closure.Atmospheric Research,234.
MLA	Nelli N.R.,et al."Micrometeorological measurements in an arid environment: Diurnal characteristics and surface energy balance closure".Atmospheric Research 234(2020).