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	Evaluating soil evaporation parameterizations at near-instantaneous scales using surface dryness indices
	Gao Y. C.; Gan, G. J.; Liu, M. F.; Wang, J. F.
	2016
关键词	Soil evaporation TSEB Relative evaporation Surface dryness index MODIS LST energy-balance model nonsaturated surfaces songnen plain heat-flux evapotranspiration water transpiration optimization vegetation budget
英文摘要	Soil evaporation is an important component in the water and energy cycles on land, especially for areas that are moderately or densely covered by bare soil. Soil evaporation parameterizations that scale down potential evaporation with the soil surface temperature (T-s) and/or the air humidity are regionally applicable because of the advantage of omitting pixel-scale near-surface soil moisture. In this paper, we provide an intercomparison study among these parameterizations. Potential evaporation indices are estimated from the Priestley-Taylor method, the Penman method, and the mass transfer method (with or without T-s). The surface dryness indices that indicate the water availability of the soil surface are based on T-s and/or the air humidity. We establish and evaluate ten such soil evaporation parameterizations through combinations of different types of potential evaporation indices and surface dryness indices at near-instantaneous scales (30 min). The results show that incorporating the soil temperature in the surface dryness index instead of the potential evaporation index can improve soil evaporation estimations. Poorer but still reasonable estimations are achieved when only the air humidity-based surface dryness index is used. In addition, the energy balance factor is crucial in the surface dryness indices. Our study indicates that the potential evaporation indices that are based on the Penman equation are generally more useful and robust than those that are based on the Priestley-Taylor approach or the mass transfer method. However, when the surface dryness index is only based on air humidity data, the Priestley Taylor potential evaporation index performs as well as the index that is estimated from the Penman equation. In contrast, a soil evaporation parameterization that estimates the potential evaporation through the mass transfer method (with T-s()) and the surface dryness index from the soil moisture content did not perform as well as the above ten parameterizations. (C) 2016 Elsevier B.V. All rights reserved.
出处	Journal of Hydrology
卷	541
页	1199-1211
语种	英语
ISSN号	0022-1694
DOI标识	10.1016/j.jhydrol.2016.08.027
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/42948]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Gao Y. C.,Gan, G. J.,Liu, M. F.,et al. Evaluating soil evaporation parameterizations at near-instantaneous scales using surface dryness indices. 2016.

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