气候变化领域集成服务门户(CCPortal): Assessment of Soil Moisture SMAP Retrievals and ELBARA-III Measurements in a Tibetan Meadow Ecosystem

CCPortal

DOI	10.1109/LGRS.2019.2897786
	Assessment of Soil Moisture SMAP Retrievals and ELBARA-III Measurements in a Tibetan Meadow Ecosystem
	Zheng, Donghai; Wang, Xin; van der Velde, Rogier; Schwank, Mike; Ferrazzoli, Paolo; Wen, Jun; Wang, Zuoliang; Colliander, Andreas; Bindlish, Rajat; Su, Zhongbo
通讯作者	Zheng, DH (通讯作者)
发表日期	2019
ISSN	1545-598X
EISSN	1558-0571
起始页码	1407
结束页码	1411
卷号	16 期号:9
英文摘要	This letter presents the results evaluating retrievals of liquid water content (theta(liq)) performed with a zero-order radiative transfer (tau-omega) model under frozen and thawed soil conditions from Soil Moisture Active Passive (SMAP) and ELBARA-III brightness temperature (T-B(P) ) measurements collected over a Tibetan meadow ecosystem. A good agreement is found between time series of the SMAP and ELBARA-III measured T-B(P) resulting in a Pearson product-moment coefficient (R) larger than 0.87. Differences noted between the two data sets can be associated with discrepancies in theta(liq) measured in the specific footprints, whereby the SMAP measurements are best explained by the in situ theta(liq). Furthermore, the in situ theta(liq) has a better agreement with the horizontally polarized SMAP and ELBARA-III measurements (T-B(H)) in the cold season, whereas the vertically polarized measurements (T-B(V)) are better correlated with liq in the warm season. With the implementation of new vegetation and surface roughness parameterizations for the tau-omega model, the dynamics of in situ theta(liq) is better reproduced by corresponding retrievals for both frozen and thawed soil conditions, leading to the reduction in the unbiased root-mean-square error (ubRMSE) by more than 31% in comparison with these retrievals using SMAP default parameterizations. Notably, the single-channel algorithm configured with the new parameterizations using SMAP T-B(V) measured during the ascending overpass provides the best theta(liq) retrievals with a ubRMSE of 0.035 m(3).m(-3) that is well within the SMAP mission requirements.
关键词	BAND MICROWAVE EMISSION NOAH MODEL PHYSICS VALIDATION SMOS VEGETATION TEMPERATURE
英文关键词	Frozen and thawed soil; grassland; L-band microwave radiometry; liquid water content; Soil Moisture Active Passive (SMAP); Tibetan Plateau
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Engineering ; Remote Sensing ; Imaging Science & Photographic Technology
WOS类目	Geochemistry & Geophysics ; Engineering, Electrical & Electronic ; Remote Sensing ; Imaging Science & Photographic Technology
WOS记录号	WOS:000484210100014
来源期刊	IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259636
推荐引用方式 GB/T 7714	Zheng, Donghai,Wang, Xin,van der Velde, Rogier,et al. Assessment of Soil Moisture SMAP Retrievals and ELBARA-III Measurements in a Tibetan Meadow Ecosystem[J]. 中国科学院青藏高原研究所,2019,16(9).
APA	Zheng, Donghai.,Wang, Xin.,van der Velde, Rogier.,Schwank, Mike.,Ferrazzoli, Paolo.,...&Su, Zhongbo.(2019).Assessment of Soil Moisture SMAP Retrievals and ELBARA-III Measurements in a Tibetan Meadow Ecosystem.IEEE GEOSCIENCE AND REMOTE SENSING LETTERS,16(9).
MLA	Zheng, Donghai,et al."Assessment of Soil Moisture SMAP Retrievals and ELBARA-III Measurements in a Tibetan Meadow Ecosystem".IEEE GEOSCIENCE AND REMOTE SENSING LETTERS 16.9(2019).