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Sampling depth of L-band radiometer measurements of soil moisture and freeze-thaw dynamics on the Tibetan Plateau
Zheng, DH (Zheng, Donghai)1; Li, X (Li, Xin)1; Wang, X (Wang, Xin)2; Wang, ZL (Wang, Zuoliang)2; Wen, J (Wen, Jun)3; van der Velde, R (van der Velde, Rogier)4; Schwank, M (Schwank, Mike)5; Su, ZB (Su, Zhongbo)4
Source PublicationREMOTE SENSING OF ENVIRONMENT
2019
Volume226Issue:0Pages:16-25
DOI10.1016/j.rse.2019.03.029
Abstract

Knowing the exact sampling depth of microwave radiometry is essential for quantifying the performance and appreciation of the applicability of satellite soil moisture products. We investigate in this study the sampling depth (delta(SM)) of the L-band microwave emission under frozen and thawed soil conditions on the Tibetan Plateau. Two years of diurnal brightness temperature (T-B(p)) measurements at a time interval of 30 min are collected by the ELBARA-III radiometer deployed at a Tibetan meadow site. Vertical profiles of soil temperature and volumetric liquid water content (theta(liq)) are measured simultaneously at soil depths up to 1 m below the surface. The impact of the theta(liq) measured at different depths on the microwave emission simulations is assessed using the tau-omega emission model, whereby the permittivity of frozen and thawed soil is estimated by the four-phase dielectric mixing model. It is found that: 1) the sampling depth for the effective temperature depends on the magnitude of theta(liq), and is estimated to be, on average, about 50 and 15 cm for the cold dry and wet warm period, respectively, because of the seasonality in theta(liq); 2) the delta(SM) is determined at 2.5 cm for both frozen and thawed soil conditions during both cold and warm periods, which is shallower than the commonly used theta(liq) measurement depth (i.e. 5 cm) adopted for the in-situ monitoring networks across the globe; 3) the T-B(p) simulations performed with the theta(liq) measurements taken at the estimated delta(SM) of 2.5 cm result in lower unbiased root mean squared errors, about 14% (3.16 K) and 22% (3.36 K) for the horizontal and vertical polarizations respectively, in comparison to the simulations with the theta(liq) measurements taken from 5 cm soil depth; and 4) the theta(liq) retrieved with the single channel algorithm from the ELBARA-III measured vertically polarized T-B(p) are in better agreement with the theta(liq) measured at 2.5 cm than the one measured at 5 cm. These findings are crucial for developing strategies for the calibration/validation as well as the application of satellite based soil moisture products relying on the L-band radiometry.

Subject AreaEnvironmental Sciences
WOS IDWOS:000468256800002
Language英语
Indexed BySCI
KeywordMicrowave Emission Validation Temperature Retrieval Smos Vegetation Model Parameterization Environment Products
WOS Research AreaEnvironmental Sciences & Ecology ; Remote Sensing ; Imaging Science & Photographic Technology
WOS SubjectEnvironmental Sciences ; Remote Sensing ; Imaging Science & Photographic Technology
Cooperation Status国际
ISSN0034-4257
Department环境变化与地表过程
URL查看原文
PublisherELSEVIER SCIENCE INC
SubtypeArticle
Citation statistics
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9293
Collection图书馆
Corresponding AuthorZheng, DH (Zheng, Donghai); Wen, J (Wen, Jun)
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China;
2.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou, Gansu, Peoples R China;
3.Chengdu Univ Informat Technol, Coll Atmospher Sci, Chengdu 610225, Sichuan, Peoples R China;
4.Univ Twente, Fac Geoinformat Sci & Earth Observat, Enschede, Netherlands;
5.Swiss Fed Res Inst WSL, Birmensdorf, Switzerland.
Recommended Citation
GB/T 7714
Zheng, DH ,Li, X ,Wang, X ,et al. Sampling depth of L-band radiometer measurements of soil moisture and freeze-thaw dynamics on the Tibetan Plateau[J]. REMOTE SENSING OF ENVIRONMENT,2019,226(0):16-25.
APA Zheng, DH .,Li, X .,Wang, X .,Wang, ZL .,Wen, J .,...&Su, ZB .(2019).Sampling depth of L-band radiometer measurements of soil moisture and freeze-thaw dynamics on the Tibetan Plateau.REMOTE SENSING OF ENVIRONMENT,226(0),16-25.
MLA Zheng, DH ,et al."Sampling depth of L-band radiometer measurements of soil moisture and freeze-thaw dynamics on the Tibetan Plateau".REMOTE SENSING OF ENVIRONMENT 226.0(2019):16-25.
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