A comparison of ASCAT and SMOS soil moisture retrievals over Europe and Northern Africa from 2010 to 2013 |
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| Institution: | 1. Comisión eNacional de Energía Atómica. Gerencia Química, Av. Gral Paz 1499, B1650KNA-San Martín, Buenos Aires, Argentina;2. Instituto de Investigación e Ingeniería Ambiental (3iA), Universidad de San Martín, Campus Miguelete, Martín de Irigoyen 3100, 1650-San Martín, Buenos Aires, Argentina;3. Instituto Nacional de Tecnología Industrial, Centro de Investigación y Desarrollo en Mecánica, Av. General Paz 5445, B1650KNA-San Martín, Buenos Aires, Argentina;4. Área de Química Analítica, Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis, San Luis, Argentina;5. Instituto de Química de San Luis (INQUISAL–CONICET), Chacabuco y Pedernera, 5700 San Luis, Argentina;6. Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;7. World Premier International (WPI) Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan;8. Consejo Nacional de Investigaciones Científicas y Técnicas, Av. Rivadavia 1917, C1033AAJ-Buenos Aires, Argentina;1. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221008, Jiangsu, China;2. National Engineering Research Center of Coal Preparation & Purification, China University of Mining and Technology, Xuzhou 221008, Jiangsu, China;3. Department of Chemical Engineering, Monash University, 18 Alliance Lane, Victoria 3800, Australia;4. School of Chemistry, 17 Rainforest Walk, Monash University, Victoria 3800, Australia |
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| Abstract: | A comparison between ASCAT/H-SAF and SMOS soil moisture products was performed in the frame of the EUMETSAT H-SAF project. The analysis was extended to the whole H-SAF region of interest, including Europe and North Africa, and the period between January 2010 and November 2013 was considered. Since SMOS and ASCAT soil moisture data are expressed in terms of absolute and relative values, respectively, different approaches were adopted to scale ASCAT data to use the same volumetric soil moisture unit. Effects of land cover, quality index filtering, season and geographical area on the matching between the two products were also analyzed. The two satellite retrievals were also compared with other independent datasets, namely the NCEP/NCAR volumetric soil moisture content reanalysis developed by NOAA and the ERA-Interim/Land soil moisture produced by ECMWF. In situ data, available through the International Soil Moisture Network, were also considered as benchmark. The results turned out to be influenced by the way ASCAT data was scaled. Correlation between the two products exceeded 0.6, while the root mean square difference did not decrease below 8%. ASCAT generally showed a fairly good degree of correlation with ERA, while, as expected considering the different kinds of measurement, the discrepancies with respect to local in situ data were large for both satellite products. |
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| Keywords: | Remote sensing SMOS ASCAT Soil moisture |
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