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ıgure 5: S5T from the mono-sensor VIIRS NOAA-20 (a), SLSTR-A (b), SLSTR-B (c) on the 1°t March 2021 
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Aigure 6: SST from L3S multi-sensor (AVHRR_METOP_B, VIIRS_NPP, SLSTR-A, SLSTR-B, MODIS_A, MODIS_T, SEVIRI, AMSR2 and VIIRS 
NOAA20) (left), and L4 SST (estimate of the SST sub-skin based on the NADA optimal software) (richt), on the 1° March 2027 
1.5 Mediterranean and Black Sea products 
Over the Mediterranean Sea (MED) and Black Sea (BS), 
the SST-TAC provides NRT and REP SST products. The 
former consists of daily (night-time) merged multi-sensor 
‚L3S) and optimally interpolated (L4) foundation SST fields 
provided at high (1/16°) and ultra-high (1/100°) spatial 
resolution, covering the period from 2008 to present 
(Buongiorno Nardelli et al., 2013). The reprocessed MED and 
BS datasets complemented the NRT production, providing 
stable long-term L4 foundation SST data records, currently 
covering the period 1982-2019 (Pisano et al., 2016). Finally, 
two (MED/BS) new L4 diurnal subskin SST products have 
been released in Mav 2021. 
During CMEMS phase 2, the NRT production has known 
significant evolutions: 
-the update of some upstream L2 SST data, such as 
the change from meteosat-10 to meteosat-11, 
- the integration of Sentinel SLSTR-3A/-3B sensors, 
the release of two new diurnal products. 
The integration of both SLSTR sensors began with the 
first data availability, in 2017 and 2019 (SLSTR-3A/-3B, 
respectively). The integration assessment showed that the 
best accuracy was achieved when using the dual view of 
SLSTR-3A as reference sensor while leaving the nadir- 
view of SLSTR-3A/-3B (as well as the dual view of SLSTR- 
3B) to the bias-adjustment procedure. With this sensors’ 
configuration, SLSTR sensors have been fully operationaı