Forcing at the western open boundary is taken from the Balticwide HBM model, which operates routinely within the CMEMS with the resolution of 1 nautical mile.
Gridded observation maps were obtained from the CMEMS multi-sensor product, which is built from bias-corrected L3 mono-sensor products at the horizontal resolution of 0.02 by 0.02 degrees.
Details of the product are described on CMEMS web resource http://cmems-resources.cls.fr/documents/QUID/CMEMS-OSI-QUID-010-009-a.pdf.
Here remote sensing SST products (SAT) from CMEMS are used for data assimilation.
In our case with CMEMS data the difference was larger near the coasts, but both the coastal areas usually appeared in the SAT data either warmer or colder than it was found from the FB data.