1. Performance of SMOS Soil Moisture Products over Core Validation Sites
- Author
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A. Colliander, Y. Kerr, J-P. Wigneron, A. Al-Yaari, N. Rodriguez-Fernandez, X. Li, J. Chaubell, P. Richaume, A. Mialon, J. Asanuma, A. Berg, D.D. Bosch, T. Caldwell, M.H. Cosh, C. Holifield Collins, J. Martínez-Fernández, H. McNairn, M.S. Seyfried, P.J. Starks, Z. Su, M. Thibeault, J.P. Walker, Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Centre d'études spatiales de la biosphère (CESBIO), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Interactions Sol Plante Atmosphère (UMR ISPA), Ecole Nationale Supérieure des Sciences Agronomiques de Bordeaux-Aquitaine (Bordeaux Sciences Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Université Grenoble Alpes (UGA), Université de Tsukuba = University of Tsukuba, University of Guelph, USDA-ARS : Agricultural Research Service, University of Texas-Pan American (UTPA), University of Texas-Pan, Universidad de Salamanca, Agriculture and Agri-Food (AAFC), University of Twente, Comisión Nacional de Actividades Espaciales - Argentinian Space Agency (CONAE), and Monash university
- Subjects
[SDE.IE]Environmental Sciences/Environmental Engineering ,Soil Moisture ,Validation ,SMAP ,Electrical and Electronic Engineering ,[SDV.SA.SDS]Life Sciences [q-bio]/Agricultural sciences/Soil study ,Geotechnical Engineering and Engineering Geology ,SMOS - Abstract
International audience; The European Space Agency (ESA) launched the SMOS (Soil Moisture Ocean Salinity) mission in 2009; currently, multiple global soil moisture (SM) products are based on the measurements of its L-band (1.4 GHz) radiometer. We compared four SMOS products with each other: Level 2, Level 3, IC (INRA-CESBIO), and Near Real Time products. The comparisons focused on core validation sites (CVS), whose spatial representativeness errors allow the estimation of the SM product performance for bias-insensitive metrics (unbiased root mean square error (ubRMSE) and correlation (R), and anomaly R) with negligible uncertainty and for bias-sensitive metrics (mean difference (MD) and root mean square difference or RMSD) with acceptable uncertainty. When the products were compared with CVS independently, the results showed that the ubRMSE, R, and anomaly R of the IC product were better than those of the other products, while the MD was larger. However, the differences between the performances were smaller when the products were assessed using only the data points when each product had a valid retrieval. This indicates that the algorithms have similar performance and that data screening and quality flagging of the retrievals markedly affects the performance. The NASA Soil Moisture Active Passive (SMAP) mission produces a similar SM product as SMOS using an L-band radiometer. The closeness of the ubRMSE, R, and anomaly R performance of the IC product and the SMAP product (0.039 m 3 /m 3 vs. 0.041 m 3 /m 3 , 0.80 vs. 0.81, and 0.75 vs. 0.75) demonstrate that the SMOS and SMAP radiometers can achieve similar SM sensitivity.
- Published
- 2023
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