气候变化领域集成服务门户(CCPortal): Using a Discrete Scattering Model to Constrain Water Cloud Model for Simulating Ground-Based Scatterometer Measurements and Retrieving Soil Moisture

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DOI	10.1109/JSTARS.2021.3111606
	Using a Discrete Scattering Model to Constrain Water Cloud Model for Simulating Ground-Based Scatterometer Measurements and Retrieving Soil Moisture
	Bai, Xiaojing; Zheng, Donghai; Wen, Jun; Wang, Xin; van der Velde, Rogier
通讯作者	Zheng, DH (通讯作者)，Chinese Acad Sci, Inst Tibetan Plateau Res, Natl Tibetan Plateau Data Ctr, State Key Lab Tibetan Plateau Earth Syst Sci, Beijing 100101, Peoples R China.
发表日期	2021
ISSN	1939-1404
EISSN	2151-1535
起始页码	9424
结束页码	9434
卷号	14
英文摘要	Potential of constraining semiempirical model with physically based scatter model simulations has long been recognized. This study contributes to this topic through the assessment of backscattering coefficient (sigma(o)) simulations and soil moisture retrieval using the water cloud model (WCM) constrained by a discrete scattering model (i.e., Tor Vergata) under both frozen and thawed soil conditions. The WCM is coupled with Oh (hereafter WCM+Oh) and Dubois (WCM+Dubois) surface scattering models, respectively. The soil permittivity is obtained using the four-phase dielectric mixing model. One year of C-band copolarized sigma(o) observations are collected by a ground-based scatterometer deployed in the seasonally frozen Tibetan meadow ecosystem. It is found that: the calibrated Tor Vergata (hereafter TVG) model simulates well the seasonal dynamics and magnitudes of scatterometer measurements, and the simulated scattering components and vegetation transmissivity agree well with the seasonal vegetation dynamics; the total scattering simulated by the TVG constrained WCMs shows a good consistency with the scatterometer measurements, and the simulated soil and vegetation scattering components are in line with the TVG simulations; and the retrieved soil moisture based on the constrained WCMs captures well the seasonal variability noted in the in situ measurements. An additional experiment is performed to calibrate the WCMs directly, and the results show that the calibrated WCMs achieve comparable results with the calibrated TVG model and the constrained WCMs in terms of the total sigma(o) and soil moisture retrieved. However, the direct calibration of the WCMs leads to unrealistic characterization of individual soil and vegetation scattering contributions, of which an underestimation of the vegetation contribution at VV polarization is most notable. These findings demonstrate that usage of a physically based scatter model to constrain semiempirical models leads to results that provide a more robust representation of reality, which is needed for developing worldwide soil moisture monitoring from active microwave remote sensing.
关键词	BAND MICROWAVE EMISSION DEPENDENT DIELECTRIC MODEL FREEZE-THAW PROCESS TIBETAN PLATEAU EMPIRICAL-MODEL VEGETATION RADAR TEMPERATURE PERMITTIVITY BACKSCATTER
英文关键词	Scattering; Soil moisture; Soil measurements; Radar measurements; Vegetation mapping; Temperature measurement; Moisture measurement; Active remote sensing; frozen soil; scattering component; Sentinel-1; soil moisture retrieval; Tibetan Plateau; Tor Vergata (TVG) model
语种	英语
WOS研究方向	Engineering ; Physical Geography ; Remote Sensing ; Imaging Science & Photographic Technology
WOS类目	Engineering, Electrical & Electronic ; Geography, Physical ; Remote Sensing ; Imaging Science & Photographic Technology
WOS记录号	WOS:000702562100004
来源期刊	IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/255151
作者单位	[Bai, Xiaojing] Nanjing Univ Informat Sci & Technol, Sch Hydrol & Water Resources, Nanjing 210044, Peoples R China; [Zheng, Donghai] Chinese Acad Sci, Inst Tibetan Plateau Res, Natl Tibetan Plateau Data Ctr, State Key Lab Tibetan Plateau Earth Syst Sci, Beijing 100101, Peoples R China; [Wen, Jun] Chengdu Univ Informat Technol, Coll Atmospher Sci, Plateau Atmosphere & Environm Key Lab Sichuan Pro, Chengdu 610059, Peoples R China; [Wang, Xin] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Land Surface Proc & Climate Change Cold &, Lanzhou 730000, Peoples R China; [van der Velde, Rogier] Univ Twente, Fac Geoinformat Sci & Earth Observat, NL-7522 Enschede, Netherlands
推荐引用方式 GB/T 7714	Bai, Xiaojing,Zheng, Donghai,Wen, Jun,et al. Using a Discrete Scattering Model to Constrain Water Cloud Model for Simulating Ground-Based Scatterometer Measurements and Retrieving Soil Moisture[J]. 中国科学院西北生态环境资源研究院,2021,14.
APA	Bai, Xiaojing,Zheng, Donghai,Wen, Jun,Wang, Xin,&van der Velde, Rogier.(2021).Using a Discrete Scattering Model to Constrain Water Cloud Model for Simulating Ground-Based Scatterometer Measurements and Retrieving Soil Moisture.IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING,14.
MLA	Bai, Xiaojing,et al."Using a Discrete Scattering Model to Constrain Water Cloud Model for Simulating Ground-Based Scatterometer Measurements and Retrieving Soil Moisture".IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING 14(2021).