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Article Dans Une Revue International Journal of Digital Earth Année : 2024

Evaluating soil moisture retrieval in Arctic and sub-Arctic environments using passive microwave satellite data

Arnaud Mialon
Yann Kerr
Alain Royer
Aaron Berg
Elyn Humphreys
Simone Bircher-Adrot

Résumé

Soil Moisture (SM) is a key parameter in northern Arctic and sub-Arctic (A-SA) environments that are highly vulnerable to climate change. We evaluated six SM satellite passive microwave datasets using thirteen ground-based SM stations across Northwestern America. The best agreement was obtained with SMAP (Soil Moisture Active Passive) products with the lowest RMSD (Root Mean Square Difference) (0.07 m$^3$ m$^{−3}$) and the highest R (0.55). ESA CCI (European Space Agency Climate Change Initiative) also performed well in terms of correlation with a similar R (0.55) but showed a strong variation among sites. Weak results were obtained over sites with high water body fractions. This study also details and evaluates a dedicated retrieval of SM from SMOS (Soil Moisture and Ocean Salinity) brightness temperatures based on the τ − ω model. Two soil dielectric models (Mironov and Bircher) and a dedicated soil roughness and single scattering albedo parameterization were tested. Water body correction in the retrieval shows limited improvement. The metrics of our retrievals (RMSD = 0.08 m$^3$ m$^{−3}$ and R = 0.41) are better than SMOS but outperformed by SMAP. Passive microwave satellite remote sensing is suitable for SM retrieval in the A-SA region, but a dedicated approach should be considered.
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Dates et versions

hal-04667588 , version 1 (05-08-2024)

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Juliette Ortet, Arnaud Mialon, Yann Kerr, Alain Royer, Aaron Berg, et al.. Evaluating soil moisture retrieval in Arctic and sub-Arctic environments using passive microwave satellite data. International Journal of Digital Earth, 2024, 17 (1), pp.2385079. ⟨10.1080/17538947.2024.2385079⟩. ⟨hal-04667588⟩
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