干旱区生态环境知识资源中心(Arid): Using SMAP Level-4 soil moisture to constrain MOD16 evapotranspiration over the contiguous USA

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DOI	10.1016/j.rse.2020.112277
	Using SMAP Level-4 soil moisture to constrain MOD16 evapotranspiration over the contiguous USA
	Brust, Colin; Kimball, John S.; Maneta, Marco P.; Jencso, Kelsey; He, Mingzhu; Reichle, Rolf H.
通讯作者	Brust, C (corresponding author), Univ Montana, WA Franke Coll Forestry & Conservat, Numer Terradynam Simulat Grp, Missoula, MT 59812 USA.
来源期刊	REMOTE SENSING OF ENVIRONMENT
ISSN	0034-4257
EISSN	1879-0704
出版年	2021
卷号	255
英文摘要	Evapotranspiration (ET) is a key hydrologic variable linking the Earth's water, carbon and energy cycles. At large spatial scales, remote sensing-based (RS) models are often used to quantify ET. Despite the large number of RS ET models available, few include soil moisture as a key environmental input, which can degrade model accuracy and utility. Here, we use model assimilation enhanced soil moisture estimates from the NASA SMAP (Soil Moisture Active Passive) mission as a water supply control in the MOD16 ET algorithm framework. SMAP-derived daily surface (0-5 cm depth) and root zone (0-1 m depth) soil moisture are used with MODIS (Moderate Resolution Imaging Spectroradiometer) vegetation observations, and 4 km gridded regional surface meteorology (Gridmet) as primary inputs for estimating daily ET and underlying model soil and stomatal conductance terms. We calibrated the model environmental response parameters using tower eddy covariance ET observations representing major North American biomes. The model ET results were validated using a holdout set of tower observations spanning a large regional climate gradient. The updated ET estimates outperform the baseline MOD16 product across all tower validation sites (RMSE = 0.758 vs 1.108 mm day(-1); R-2 = 0.68 vs 0.45, respectively). Smaller relative improvements were obtained using a recalibrated model with 4 km Gridmet meteorology, but no soil moisture control (RMSE = 0.813 mm day(-1); R-2 = 0.66), indicating that these changes are essential for the improved model performance. The soil moisture-constrained model improvements and relative benefits from the SMAP observations are greater in arid climates, consistent with stronger soil moisture control on ET in water-limited regions. The use of SMAP soil moisture as an additional model constraint improves MOD16 regional performance and provides a new framework for investigating both soil and atmosphere controls on ET.
英文关键词	Evapotranspiration SMAP MODIS MOD16 Soil moisture
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000619233100004
WOS类目	Environmental Sciences ; Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向	Environmental Sciences & Ecology ; Remote Sensing ; Imaging Science & Photographic Technology
来源机构	北京大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368947
作者单位	[Brust, Colin; Kimball, John S.] Univ Montana, WA Franke Coll Forestry & Conservat, Numer Terradynam Simulat Grp, Missoula, MT 59812 USA; [Maneta, Marco P.] Univ Montana, Dept Geosci, Missoula, MT 59812 USA; [Jencso, Kelsey] Univ Montana, Montana Climate Off, WA Franke Coll Forestry & Conservat, Missoula, MT 59812 USA; [He, Mingzhu] Peking Univ, Sino French Inst Earth Syst Sci, Coll Urban & Environm Sci, Beijing 10087, Peoples R China; [Reichle, Rolf H.] NASA, Global Modeling & Assimilat Off, Goddard Space Flight Ctr, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA
推荐引用方式 GB/T 7714	Brust, Colin,Kimball, John S.,Maneta, Marco P.,et al. Using SMAP Level-4 soil moisture to constrain MOD16 evapotranspiration over the contiguous USA[J]. 北京大学,2021,255.
APA	Brust, Colin,Kimball, John S.,Maneta, Marco P.,Jencso, Kelsey,He, Mingzhu,&Reichle, Rolf H..(2021).Using SMAP Level-4 soil moisture to constrain MOD16 evapotranspiration over the contiguous USA.REMOTE SENSING OF ENVIRONMENT,255.
MLA	Brust, Colin,et al."Using SMAP Level-4 soil moisture to constrain MOD16 evapotranspiration over the contiguous USA".REMOTE SENSING OF ENVIRONMENT 255(2021).