气候变化领域集成服务门户(CCPortal): Evaluating effects of Dielectric Models on the surface soil moisture retrieval in the Qinghai-Tibet Plateau

CCPortal

DOI	10.3724/SP.J.1226.2021.20067
	Evaluating effects of Dielectric Models on the surface soil moisture retrieval in the Qinghai-Tibet Plateau
	Liu, Rong; Wang, Xin; Wang, ZuoLiang; Wen, Jun
通讯作者	Liu, R (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Land Surface Proc & Climate Change Cold &, 320 West Donggang Rd, Lanzhou 730000, Gansu, Peoples R China.
发表日期	2021
ISSN	1674-3822
起始页码	62
结束页码	76
卷号	13 期号:1
英文摘要	Based on the measurement of L-band ground-based microwave radiometer (ELBARA-III type) in the Qinghai-Tibet Plateau and the tau - omega radiative transfer model, this research evaluated the effects of four soil dielectric models, i.e., Wang-Schmugge, Mironov, Dobson, and Four-phase, on the L-band microwave brightness temperature simulation and soil moisture retrieval. The results show that with the same vegetation and roughness parameterization scheme, the four soil dielectric models display obvious differences in microwave brightness temperature simulation. When the soil moisture is less than 0.23 m(3)/m(3), the simulated microwave brightness temperature in Wang-Schmugge model is significantly different from that of the other three models, with maximum differences of horizontal polarization and vertical polarization reaching 8.0 K and 4.4 K, respectively; when the soil moisture is greater than 0.23 m(3)/m(3), the simulated microwave brightness temperature of Four-phase significantly exceeds that of the other three models; when the soil moisture is saturated, maximum differences in simulated microwave brightness temperature with horizontal polarization and vertical polarization are 6.1 K and 4.8 K respectively, and the four soil dielectric models are more variable in the microwave brightness temperature simulation with horizontal polarization than that with vertical polarization. As for the soil moisture retrieval based on the four dielectric models, the comparison study shows that, under the condition of horizontal polarization, Wang-Schmugge model can reduce the degree of retrieved soil moisture underestimating the observed soil moisture more effectively than other parameterization schemes, while under the condition of vertical polarization, the Mironov model can reduce the degree of retrieved soil moisture overestimating the observed soil moisture. Finally, based on the Wang-Schmugge model and FengYun-3C observation data, the spatial distribution of soil moisture in the study area is retrieved.
关键词	BAND MICROWAVE EMISSION BRIGHTNESS TEMPERATURES DYNAMICS WATER PERMITTIVITY SMOS GHZ
英文关键词	L-band; microwave brightness temperature; soil dielectric model; soil moisture retrieval
语种	英语
WOS研究方向	Physical Geography
WOS类目	Geography, Physical
WOS记录号	WOS:000616396000006
来源期刊	SCIENCES IN COLD AND ARID REGIONS
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/253734
作者单位	[Liu, Rong; Wang, Xin; Wang, ZuoLiang] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Land Surface Proc & Climate Change Cold &, 320 West Donggang Rd, Lanzhou 730000, Gansu, Peoples R China; [Wen, Jun] Chengdu Univ Informat Technol, Coll Atmospher Sci, Chengdu 610225, Sichuan, Peoples R China
推荐引用方式 GB/T 7714	Liu, Rong,Wang, Xin,Wang, ZuoLiang,et al. Evaluating effects of Dielectric Models on the surface soil moisture retrieval in the Qinghai-Tibet Plateau[J]. 中国科学院西北生态环境资源研究院,2021,13(1).
APA	Liu, Rong,Wang, Xin,Wang, ZuoLiang,&Wen, Jun.(2021).Evaluating effects of Dielectric Models on the surface soil moisture retrieval in the Qinghai-Tibet Plateau.SCIENCES IN COLD AND ARID REGIONS,13(1).
MLA	Liu, Rong,et al."Evaluating effects of Dielectric Models on the surface soil moisture retrieval in the Qinghai-Tibet Plateau".SCIENCES IN COLD AND ARID REGIONS 13.1(2021).