研究目的
Investigating the inversion of surface soil moisture (SSM) from radar altimetry backscattering coefficients in semi-arid environments.
研究成果
A good correlation was observed between radar altimetry coefficients and SSM from ORCHIDEE LSM over sandy areas without open water in the Gourma region of Mali (R2=0.71). The developed method for inverting SSM from radar altimetry backscattering coefficients shows promise for application in semi-arid regions.
研究不足
The method is limited to sandy areas without open water in the altimeter footprint. The coarse spatial resolution of the LSM grid step may affect the accuracy of SSM estimates.
1：Experimental Design and Method Selection:
The study proposes an inversion method combining radar altimetry backscattering coefficients (σ0) and land surface model (LSM) outputs to retrieve SSM.
2：Sample Selection and Data Sources:
Altimetry data from ERS-2, ENVISAT, Jason-1 and 2, and SARAL missions were used. SSM outputs from the ORCHIDEE LSM and in situ soil moisture data from Mali were also utilized.
3：List of Experimental Equipment and Materials:
Radar altimeters on-board satellites (ERS-2, ENVISAT, Jason-1 and 2, SARAL).
4：Experimental Procedures and Operational Workflow:
Selection of valid altimetry data based on soil type and absence of open water in the altimeter footprint. Inversion of SSM using a linear combination of radar altimetry backscattering coefficients and ORCHIDEE SSM estimates.
5：Data Analysis Methods:
Generalized least squares criteria were used for the inversion, with validation against in situ measurements.
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