气候变化领域集成服务门户(CCPortal): Surface Roughness Effect on L-Band Multiangular Brightness Temperature Modeling and Soil Liquid Water Retrieval of Frozen Soil

CCPortal

DOI	10.1109/LGRS.2020.3004712
	Surface Roughness Effect on L-Band Multiangular Brightness Temperature Modeling and Soil Liquid Water Retrieval of Frozen Soil
	Wu, Xiaojing; Zheng, Donghai
通讯作者	Zheng, DH (通讯作者)
发表日期	2021
ISSN	1545-598X
EISSN	1558-0571
起始页码	1615
结束页码	1619
卷号	18 期号:9
英文摘要	A less explored aspect of L-band microwave emission is the surface roughness effect on the multiangular brightness temperature (T-B(p)) modeling and retrieval of liquid water content (theta(liq)) in frozen soil. This letter investigates this effect based on a data set of multiangular ETH L-band radiometer (ELBARA-III) T-B(p) measurements performed in a seasonally frozen Tibetan meadow ecosystem. The surface roughness effect is first investigated via comparing the performance of the HQN model and Shi's parameterization of the integral equation model in simulating the measured T-B(p) signatures. Overestimations are noted for the two model simulations at the vertical polarization in comparison to the ELBARA-III measurements, and Shi's model with Gaussian autocorrelation function shows better performance especially for the vertical polarization at large incidence angles. The HQN model is then calibrated with the multiangular T-B(p) measurements, which leads to h = 0 and Q > 0 that depends on the polarization. As such, the noncoherent emission contribution to cross-polarization mixing can be accounted for by the HQN model. Furthermore, theta(liq) retrievals are derived from the multiangular T-B(p) measurements using the default and optimized HQN model and Shi's model and compared to the in situ theta(liq). Unbiased root-mean-square errors of less than 0.025 m(3) m(-3) are obtained for these retrievals, which are well within the satellite mission requirements. This study demonstrates that the multiangular Tp B modeling can be enhanced with site-specific calibration of the HQN model that also leads to the improvement of the theta(liq) retrievals, and consideration of polarization mixing is necessary for L-band emission modeling.
关键词	MOISTURE RETRIEVAL MICROWAVE EMISSION PARAMETERIZATION PERMITTIVITY SMOS
英文关键词	Frozen soil; L-band microwave radiometry; multiangular brightness temperatures; polarization mixing; soil moisture and ocean salinity (SMOS); surface roughness; 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:000690441200029
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/260123
推荐引用方式 GB/T 7714	Wu, Xiaojing,Zheng, Donghai. Surface Roughness Effect on L-Band Multiangular Brightness Temperature Modeling and Soil Liquid Water Retrieval of Frozen Soil[J]. 中国科学院青藏高原研究所,2021,18(9).
APA	Wu, Xiaojing,&Zheng, Donghai.(2021).Surface Roughness Effect on L-Band Multiangular Brightness Temperature Modeling and Soil Liquid Water Retrieval of Frozen Soil.IEEE GEOSCIENCE AND REMOTE SENSING LETTERS,18(9).
MLA	Wu, Xiaojing,et al."Surface Roughness Effect on L-Band Multiangular Brightness Temperature Modeling and Soil Liquid Water Retrieval of Frozen Soil".IEEE GEOSCIENCE AND REMOTE SENSING LETTERS 18.9(2021).