Sampling depth of L-band radiometer measurements of soil moisture and freeze-thaw dynamics on the Tibetan Plateau
文献类型：期刊论文
| 作者 | Zheng, Donghai1; Li, Xin1; Wang, Xin2; Wang, Zuoliang2; Wen, Jun3; van der Velde, Rogier4; Schwank, Mike5; Su, Zhongbo4 |
| 刊名 | REMOTE SENSING OF ENVIRONMENT
 |
| 出版日期 | 2019-06-01 |
| 卷号 | 226页码:16-25 |
| 关键词 | L-band radiometry Sampling depth Diurnal variations Grassland Soil Moisture Active Passive (SMAP) Soil Moisture and Ocean Salinity (SMOS) |
| ISSN号 | 0034-4257 |
| DOI | 10.1016/j.rse.2019.03.029 |
| 通讯作者 | Zheng, Donghai(zhengd@itpcas.ac.cn) ; Wen, Jun(jwen@cuit.edu.cn) |
| 英文摘要 | 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. |
| 收录类别 | SCI |
| WOS关键词 | MICROWAVE EMISSION ; VALIDATION ; TEMPERATURE ; RETRIEVAL ; SMOS ; VEGETATION ; MODEL ; PARAMETERIZATION ; ENVIRONMENT ; PRODUCTS |
| WOS研究方向 | Environmental Sciences & Ecology ; Remote Sensing ; Imaging Science & Photographic Technology |
| WOS类目 | Environmental Sciences ; Remote Sensing ; Imaging Science & Photographic Technology |
| 语种 | 英语 |
| WOS记录号 | WOS:000468256800002 |
| 出版者 | ELSEVIER SCIENCE INC |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2555448 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Zheng, Donghai; Wen, Jun |
| 作者单位 | 1.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 |
| 推荐引用方式 GB/T 7714 | Zheng, Donghai,Li, Xin,Wang, Xin,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,2019,226:16-25. |
| APA | Zheng, Donghai.,Li, Xin.,Wang, Xin.,Wang, Zuoliang.,Wen, Jun.,...&Su, Zhongbo.(2019).Sampling depth of L-band radiometer measurements of soil moisture and freeze-thaw dynamics on the Tibetan Plateau.REMOTE SENSING OF ENVIRONMENT,226,16-25. |
| MLA | Zheng, Donghai,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(2019):16-25. |
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来源：寒区旱区环境与工程研究所
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