SMOS Sea Surface Salinity
Operational v1.0 – Reprocessed

 

Years 2010 – 2013

ESA reprocessing campaign covered all the SMOS data from January 2010 until December 2013 up to L2. The processors used were: L1 Operational Processor version L1OP504 and L2 Operational Processor version L2OSOP550. The L3 reprocessing campaign was performed at SMOS-BEC in a wide variety of averaging times for L2 data in boxes of 0.25×0.25 deg. The maps are built by separating ascending, descending orbits, and mixing both of them

Related documents

Products description: BEC-SMOS-0001-PD.pdf
Quality Report: BEC-SMOS-0005-QR.pdf
Comparison between 2012 reprocessed data and NRT: BEC-SMOS-0003-QR.pdf
Comparison between 2013 reprocessed data and NRT: BEC-SMOS-0004-QR.pdf

 

Available products

 

Spatial resolution: 0.25 degree

 

Binned products

The SMOS data used to compute Binned products come from Level 2 Ocean Salinity User Data Product (UDP). These UDP files are generated by ESA and include geophysical parameters, a theoretical estimate of their accuracy, and flags and descriptors for the product quality. The binned maps are constructed by BEC by simple averaging of the filtered L2 SSS values.

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Optimal interpolation products

Level 2 data is optimal interpolated (Objective Analysis) to produce L3 maps with greater accuracy and interpolated into data gaps. To reduce the computational cost, the actual data fedding the OI algorithm are the 0.25º x 0.25º grid binned L3 data. The OI is performed using monthly WOA 2009 dataset.

L3 maps are validated with near-surface measurements provided by Argo profilers, which allow us to define several quality metrics. We have found that the implementation of these techniques significantly improve data accuracy with respect to L3 binned maps.

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Fused products using singularity analysis techniques

There is some evidence that different ocean scalars possess the same singularity exponent – what should be expected if singularity exponents are the result of flow advection. This correspondence of singularity exponents is exploited by BEC to diminish the effect of noise and artifacts on Sea Surface Salinity SMOS level 3 maps. The algorithm uses the information conveyed by the singularity exponents derived from daily OSTIA SST to produce fused salinity maps.

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