SMOS Sea surface Salinity
Operational V2.0 – Near real time


Year 2010 – present

Land Sea Contamination has been mitigated by means of the empirical salinity debiasing method proposed in [Olmedo et al., 2016]. To address different user needs, various products are being generated:

Related documents

Products description: BEC-SMOS-0001-PD.pdf
Quality Report: BEC-SMOS-0008-QR.pdf


Available products


Spatial resolutions: 0.05 degree, 0.25 degree and 1.00 degree


Daily gridded L2 maps

This product is devoted to those users interested in working with SMOS SSS data, but who are not familiarized with the “official format”. All the L2 SSS satellite overpasses with the same orbit direction, that is ascending and descending separately, in the same day are put together in a regular cylindrical 0:25ox0:25o grid and distributed in netCDF files.

Daily product

Monthly binned L3 maps

This product aims to final users who are interested in global, calibrated SMOS SSS maps. The previous versions of the BEC L3 maps were served at a 0.25 degree grid for an averaged period of 9 days. It was found that at those spatial and temporal resolutions, noise dominated over the geophysical structures. In this new release, the binned products are served at a 1 degree grid for an averaged period of one month.

Monthly product

Objectivelly analyzed L3 maps

The previous optimally interpolated (OI) BEC SSS maps are being replaced by objectively analyzed (OA) SSS maps, using the same parameters as described in [Zeng et al., 2013]. The OA L3 maps are served daily, in a 0.25 degree grid for an averaged period of nine days

9-days average

Data fused L4 maps

Operational Sea Temperature and Ice Analysis (OSTIA) SST daily maps at a 0.05 degree (see [Donlon et al., 2012]) are used to increase the spatial and temporal resolution of the daily 9-day averaged OA maps. The OSTIA system is part of the Group for High Resolution Sea Surface Temperature (GHRSST), and is currently served in the Copernicus web portal. Several fusion parameters have been tuned to improve the fused product as described in [Olmedo et al., 2016].

9-days average

[ Olmedo et al., 2016] Olmedo, E., Martínez, J., Umbert, M., Hoareau, N., Portabella, M., Ballabrera, J., Turiel, A. (2016).Improving time and space resolution of SMOS salinity maps using multifractal fusion. Remote Sensing of Environment 180, 246-263. DOI: 10.1016/j.rse.2016.02.038

[Zweng et al., 2013] Zweng, M. M., Reagan, J. R., Antonov, J. I., Locarnini, R. A., Mishonov, A. V., Boyer, T. P., Garcia, H. E., Baranova, O. K., Johnson, D. R., Seidov, D., and Biddle, M. M. (2013). World Ocean Atlas 2013, Volume 2: Salinity. Levitus, Ed., A. Mishonov Technical Ed.; NOAA Atlas NESDIS 74, 39 pp. Download publication

[Donlon et al., 2012] Donlon, C. J., Martin, M., Stark, J., Roberts-Jones, J., Fiedler, E., & Wimmer, W. (2012). The operational sea surface temperature and sea ice analysis (ostia) system. Remote Sensing and Enviroment, 116(0), 140–158. DOI: 10.1016/j.rse.2010.10.017