气候变化领域集成服务门户(CCPortal): Active and Passive Microwave Signatures of Diurnal Soil Freeze-Thaw Transitions on the Tibetan Plateau

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DOI	10.1109/TGRS.2021.3092411
	Active and Passive Microwave Signatures of Diurnal Soil Freeze-Thaw Transitions on the Tibetan Plateau
	Zheng, Donghai; Li, Xin; Wen, Jun; Hofste, Jan G.; van der Velde, Rogier; Wang, Xin; Wang, Zuoliang; Bai, Xiaojing; Schwank, Mike; Su, Zhongbo
通讯作者	Zheng, DH (通讯作者)，Chinese Acad Sci, Natl Tibetan Plateau Data Ctr, Inst Tibetan Plateau Res, State Key Lab Tibetan Plateau Earth Syst Sci, Beijing 100101, Peoples R China.
发表日期	2022
ISSN	0196-2892
EISSN	1558-0644
卷号	60
英文摘要	Active and passive microwave characteristics of diurnal soil freeze-thaw transitions and their relationships are crucial for developing retrieval algorithms of the soil liquid water content ( $theta_{liq}$ ) and freeze/thaw state, which, however, have been less explored. This study investigates these microwave characteristics and relationships via analysis of ground-based measurements of brightness temperature ( $T_{B}$ ) and backscattering coefficients (sigma SUPERSCRIPT ZERO) in combination with simulations performed with the Tor Vergata discrete radiative transfer model. Both an L-band (1.4 GHz) radiometer ELBARA-III and a wide-band (1-10 GHz) scatterometer are installed in a seasonally frozen Tibetan meadow ecosystem to measure diurnal variations of TB and copolarized sigma SUPERSCRIPT ZERO at both hh (sigma $_{hh}$ SUPERSCRIPT ZERO) and vv (sigma $_{vv}$ SUPERSCRIPT ZERO) polarizations. Analysis of measurements collected between December 2017 and March 2018 shows that 1) diurnal cycles are observed in both T $_{B}$ and sigma SUPERSCRIPT ZERO due to the change in surface theta liq caused by diurnal soil freeze-thaw transitions; 2) a negatively linear relationship is found between e and sigma SUPERSCRIPT ZERO regardless of frequency, polarization combinations, and observation angles; 3) slopes (beta ) of linearly fit equations between eH and sigma $_{hh}$ SUPERSCRIPT ZERO decrease with increasing observation angles of ELBARA-III, while the ones between eV and sigma $_{vv}$ SUPERSCRIPT ZERO increase with increasing observation angles; and 4) correlations between e and sigma SUPERSCRIPT ZERO increase with decreasing microwave frequency of sigma SUPERSCRIPT ZERO measurements and ELBARA-III observation angles, and magnitudes of diurnal sigma SUPERSCRIPT ZERO cycles also increase with decreasing microwave frequency. Moreover, the calibrated Tor Vergata model shows capability to reproduce both diurnal e and sigma SUPERSCRIPT ZERO variations as well as to quantify their relationships at different frequencies and observation angles.
关键词	MOISTURE RETRIEVAL SMAP BAND MODEL EMISSION RADAR VALIDATION SCATTERING IMPACT STATE
英文关键词	Microwave radiometry; Microwave measurement; Soil measurements; Temperature measurement; Radar measurements; Electromagnetic heating; Spaceborne radar; Active and passive; frozen soil; L-band microwave radiometry; sentinel; soil moisture active passive (SMAP); soil moisture and ocean salinity (SMOS); wide-band microwave scatterometer
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:000733545500001
来源期刊	IEEE TRANSACTIONS ON GEOSCIENCE 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/255060
作者单位	[Zheng, Donghai; Li, Xin] Chinese Acad Sci, Natl Tibetan Plateau Data Ctr, Inst Tibetan Plateau Res, 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 610225, Peoples R China; [Hofste, Jan G.; van der Velde, Rogier; Su, Zhongbo] Univ Twente, Fac Geoinformat Sci & Earth Observat, NL-7500 AE Enschede, Netherlands; [Wang, Xin; Wang, Zuoliang] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Land Surface Proc & Climate Change Cold &, Lanzhou 730000, Peoples R China; [Bai, Xiaojing] Nanjing Univ Informat Sci & Technol, Coll Hydrometeorol, Nanjing 210044, Peoples R China; [Schwank, Mike] Swiss Fed Res Inst WSL, CH-8903 Birmensdorf, Switzerland
推荐引用方式 GB/T 7714	Zheng, Donghai,Li, Xin,Wen, Jun,et al. Active and Passive Microwave Signatures of Diurnal Soil Freeze-Thaw Transitions on the Tibetan Plateau[J]. 中国科学院西北生态环境资源研究院,2022,60.
APA	Zheng, Donghai.,Li, Xin.,Wen, Jun.,Hofste, Jan G..,van der Velde, Rogier.,...&Su, Zhongbo.(2022).Active and Passive Microwave Signatures of Diurnal Soil Freeze-Thaw Transitions on the Tibetan Plateau.IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING,60.
MLA	Zheng, Donghai,et al."Active and Passive Microwave Signatures of Diurnal Soil Freeze-Thaw Transitions on the Tibetan Plateau".IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING 60(2022).