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SMOS was the first mission providing global measurements of L-band brightness temperatures resulting in soil moisture and ocean salinity data sets from space, directly responding to the lack of such measurements for hydrological and oceanographic applications (Kerr et al., 2010). Both these parameters are key variables within the Earth's water ...
Both the SMOS-IC SM and L-VOD products released in version 105 (V105) have been evaluated in several studies. Recent inter-comparisons have found that the SMOS-IC, SMAP and ESA CCI (Climate Change Initiative) SM products have very good performances, each product being more or less performant depending on specific soil and vegetation conditions (Al-Yaari et al., 2019a; Ma et al., 2019; Quets et ...
The SMOS is the major satellite remote sensing mission for soil moisture measurements. The SMOS mission was proposed by Centre d’Etudes Spatiales de la BIOsphère (CESBIO) headed by Yann H. Kerr and was launched on November 2, 2009, as a second Earth Explorer Opportunity after Gravity Field and Steady-State Ocean Explorer (GOCE).
In the official SMOS L2 & L3 retrieval algorithm used for SMOS-L3 products, the soil moisture and VOD are simultaneously retrieved by using multiangular and dual polarization satellite TB observations, and the L-band Microwave Emission of Biosphere (L-MEB) model is adopted as the forward model (Wigneron et al., 2017). The surface temperature ...
To start, the SMOS-L3 SSM data are masked when DQX is over 0.07 or equal to the fill value – indicating that SSM retrieval has failed (Polcher et al., 2016). Second, SMOS-L3 SSM values are rejected if their RFI fraction variable exceeds 0.3 (Al-Yaari et al., 2014a). Likewise, based on the recommendation in the SMOS-IC User’s Guide, SMOS-IC ...
SMOS has global coverage with a revisit period of 3 days at the equator, with all together in the same line, if possible overpass at 6:00 am and descending (D) overpass 6:00 pm local solar time. The SMOS instrument is a passive 2D interferometer operating at L band (1.4 GHz) (Kerr et al., 2001, Kerr et al., 2010).
In this study, SMOS level 3 brightness temperatures T B p processed by CATDS (Centre Aval de Traitement des Données SMOS) are applied. The data are daily gridded, transformed from the satellite reference frame to the ground polarization reference frame p = H (horizontal), V (vertical) and provided in the global Equal-Area Scalable Earth Grid ...
For the SMOS-IC QC SM data, we masked data if one of the following conditions was met SM was smaller than 0 cm 3 cm −3, higher than 0.60 cm 3 cm −3, the scene flag was greater than one, or the Tb-RMSE flag values were larger than 5 K. Similarity, for the ASCAT QC SM data, we masked SM data if SM is <0 cm 3 cm −3, exceeds the porosity ...
We compare Acard SMOS with Acard KS computed with parameters available in the SMOS User Data Product, i.e. SSS SMOS and SST ECMWF. A first correction on SSS SMOS can then be determined using the following relationship that also consider absolute calibration (section 4.2.): (2) SSS SMOS A = SSS SMOS + Acard KS – Acard SMOS λ (SST ECMWF, SSS ...
For instance, both the SMAP-IB and SMOS-IC daily retrievals were excluded when the flag of “Scene Flags” > 1 to filter out retrievals impacted by strong topography, pixel heterogeneity (e.g., water and urban fractions) and presence of frozen conditions (e.g., snow, ice); we also used the SMOS-IC filter defined by “TB-RMSE” > 8 K to ...