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Sea surface salinity (SSS) from SMOS

CliSAP/CEN product

Access

RESTRICTED only accessable in CEN/MPI net or via CliSAP login  What does that mean?

Access data via file system: /data/icdc/ocean/smos_sss

 

Description

The ESA mission SMOS was planned with the aim of obtaining more precise data concerning the global water cycle. The exchange of water between land, ocean and atmosphere is one of the principal factors influencing weather and climate patterns. Constituents of the global hydrological cycle that can be measured with SMOS are a) the soil moisture, b) the ocean surface salinity, and c) the thin (< 50 cm) sea ice thickness.

SMOS is a polar orbiting satellite based passive microwave sensor operating at L-Band (1.4 GHz). The brightness temperature measured by SMOS at L-Band is dependent on the SST and SSS of the seawater as well as on the sea surface roughness induced by wind and waves. The surface salinity is derived by inverse models on a global basis, taking auxiliary information about the SST and the sea surface roughness into account.

This new (Version 4) data set of the SMOS sea surface salinity produced by the University of Hamburg contains estimates of the theoretical retrieval error and a bias corrected salinity at a finer grid resolution of 0.5 x 0.5 degrees. The bias  is obtained from a comparison of the SMOS data with in situ salinity data (EN4.2), comprising mostly ARGO float observations. The data set includes the uncorrected and gridded as well as  the bias-corrected version of the SMOS sea surface salinity.

Last update of the data set: May 18, 2017.

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Parameters

Name Unit
Sea surface salinity --
Bias-corrected sea surface salinity --
Bias-corrected objectively mapped sea surface salinity --
Theoretical retrieval error --
Bias --

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Coverage, spatial and temporal resolution

Period and temporal resolution:

  • 07/2010 to 12/2016
  • Monthly

Coverage and spatial resolution:

  • Global
  • Spatial resolution: 0.5° x 0.5°, cartesian grid
  • Geographical latitude: -89.5°N to 89.5°N
  • Geographical longitutde: -179.5°E to 179.5°E
  • Dimension: 359 rows x 719 columns
  • Altitude: 0.0 m

Format:

  • NetCDF

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Data quality

This new (Version 4) data set of the SMOS sea surface salinity produced by the University of Hamburg contains estimates of the theoretical retrieval error and the bias. Both, the bias, which is obtained from a comparison of the SMOS data set with buoy data (see SVP-Drifter data set) and ARGO float observations (see EN4.2), and the bias-corrected version of the SMOS sea surface salinity are included in the product. We refer to the references for more information and/or recommend to get into contact Meike Sena-Martins.

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Contact

Meike Sena-Martins
Institute of Oceanography / CEN / University of Hamburg
email: meike.sena-martins (at) uni-hamburg.de

Stefan Kern
ICDC / CEN / University of Hamburg
email: stefan.kern (at) uni-hamburg.de

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References

General information about SMOS data products via ESA.

Results from evaluation / inter-comparison studies:

  • Köhler, J., et al., 2015, Quality assessment of spaceborne sea surface salinity observations over the northern North Atlantic, J. Geophys. Res. - Oceans, 120, 94-112.

Data citation

When using this data please acknowledge

SMOS ocean surface salinity was distributed in netCDF format by the Integrated Climate Data Center (ICDC, http://icdc.cen.uni-hamburg.de) University of Hamburg, Hamburg, Germany.

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