干旱区生态环境知识资源中心(Arid): Effect of surface temperature on soil moisture retrieval using CYGNSS

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DOI	10.1016/j.jag.2022.102929
	Effect of surface temperature on soil moisture retrieval using CYGNSS
	Zhu, Yifan; Guo, Fei; Zhang, Xiaohong
通讯作者	Guo, F
来源期刊	INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
ISSN	1569-8432
EISSN	1872-826X
出版年	2022
卷号	112
英文摘要	In this paper, a soil moisture (SM) retrieval model from spaceborne Global Navigation Satellite System Reflectometry (GNSS-R) observations that incorporates soil surface temperature (SST) for the first time is evaluated. Here, based on the grid scale, Cyclone GNSS (CYGNSS) reflectivity, SST and vegetation optical depth (VOD) are employed to estimate SM by a trilinear regression, while the other influence factors such as soil roughness and texture are regard as static. The results are compared with globally Soil Moisture Active Passive (SMAP) SM and in-situ measurements from International Soil Moisture Network (ISMN) over the year of 2018 respectively, showing a good consistency (R = 0.929 and RMSE = 0.043 cm(-3)cm(-3) against SMAP SM; R = 0.927 and RMSE = 0.042 cm(3)cm(-3) against in-situ SM). Although the sensitivity of reflectivity to SST is found to be much smaller than that to SM from the simulation, the incorporation of SST is demonstrated to be effective in SM estimation for its coupling relationship with SM. In the comparison with SMAP SM, the improvements of RMSE by incorporating SST are varying degrees globally, and significant in many arid areas with an improvement of over 40%. In the in-situ validation, the overall RMSE decreases from 0.047 to 0.042 cm(3)cm(-3) with an improvement of 10.6%. This work demonstrates the necessity and improvement for incorporating SST into SM retrieval for GNSS-R. Moreover, the findings provide a potential method to obtain global SST dataset from CYGNSS observations.
英文关键词	Soil moisture (SM) Soil surface temperature (SST) Global Navigation Satellite System Reflectometry (GNSS-R) Cyclone Global Navigation Satellite System (CYGNSS)
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000844328700003
WOS关键词	REFLECTOMETRY ; PERFORMANCE ; OCEAN
WOS类目	Remote Sensing
WOS研究方向	Remote Sensing
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/393119
推荐引用方式 GB/T 7714	Zhu, Yifan,Guo, Fei,Zhang, Xiaohong. Effect of surface temperature on soil moisture retrieval using CYGNSS[J],2022,112.
APA	Zhu, Yifan,Guo, Fei,&Zhang, Xiaohong.(2022).Effect of surface temperature on soil moisture retrieval using CYGNSS.INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION,112.
MLA	Zhu, Yifan,et al."Effect of surface temperature on soil moisture retrieval using CYGNSS".INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION 112(2022).