气候变化领域集成服务门户(CCPortal): Controls on surface soil drying rates observed by SMAP and simulated by the Noah land surface model

CCPortal

DOI	10.5194/hess-22-1649-2018
	Controls on surface soil drying rates observed by SMAP and simulated by the Noah land surface model
	Shellito P.J.; Small E.E.; Livneh B.
发表日期	2018
ISSN	1027-5606
起始页码	1649
结束页码	1663
卷号	22 期号:3
英文摘要	Drydown periods that follow precipitation events provide an opportunity to assess controls on soil evaporation on a continental scale. We use SMAP (Soil Moisture Active Passive) observations and Noah simulations from drydown periods to quantify the role of soil moisture, potential evaporation, vegetation cover, and soil texture on soil drying rates. Rates are determined using finite differences over intervals of 1 to 3 days. In the Noah model, the drying rates are a good approximation of direct soil evaporation rates, and our work suggests that SMAP-observed drying is also predominantly affected by direct soil evaporation. Data cover the domain of the North American Land Data Assimilation System Phase 2 and span the first 1.8 years of SMAP's operation. Drying of surface soil moisture observed by SMAP is faster than that simulated by Noah. SMAP drying is fastest when surface soil moisture levels are high, potential evaporation is high, and when vegetation cover is low. Soil texture plays a minor role in SMAP drying rates. Noah simulations show similar responses to soil moisture and potential evaporation, but vegetation has a minimal effect and soil texture has a much larger effect compared to SMAP. When drying rates are normalized by potential evaporation, SMAP observations and Noah simulations both show that increases in vegetation cover lead to decreases in evaporative efficiency from the surface soil. However, the magnitude of this effect simulated by Noah is much weaker than that determined from SMAP observations. © 2018 Author(s).
语种	英语
scopus关键词	Drying; Evaporation; Moisture; Soil moisture; Vegetation; Continental scale; Land surface modeling; North american land data assimilation systems; Potential evaporation; Precipitation events; Soil evaporation rates; Soil evaporations; Surface soil moisture; Soils; data assimilation; evaporation; finite difference method; land surface; simulation; soil moisture; soil texture; vegetation cover; North America
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160092
作者单位	Shellito, P.J., Geological Sciences, University of Colorado Boulder, Boulder, 80309, United States; Small, E.E., Geological Sciences, University of Colorado Boulder, Boulder, 80309, United States; Livneh, B., Cooperative Institute for Research in Environmental Science, Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, Boulder, 80309, United States
推荐引用方式 GB/T 7714	Shellito P.J.,Small E.E.,Livneh B.. Controls on surface soil drying rates observed by SMAP and simulated by the Noah land surface model[J],2018,22(3).
APA	Shellito P.J.,Small E.E.,&Livneh B..(2018).Controls on surface soil drying rates observed by SMAP and simulated by the Noah land surface model.Hydrology and Earth System Sciences,22(3).
MLA	Shellito P.J.,et al."Controls on surface soil drying rates observed by SMAP and simulated by the Noah land surface model".Hydrology and Earth System Sciences 22.3(2018).