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Surface chlorophyll and sea surface temperature output by the POLCOMS-ERSEM model (Butenschön et al. 2016) for the North East Atlantic and Mediterranean have been compared to satellite values, using monthly values for years 1998-2015. Satellite chlorophyll data come from the European Space Agency Climate Change Initiative Ocean Colour project (httphttps://wwwclimate.esa-
oceancolour-cci.org.int/en/projects/ocean-colour/, v3.1). Sea surface temperature is from the Operational Sea Surface Temperature and Sea Ice Analysis (OSTIA) dataset (Donlon et al. 2012), downloaded from the Copernicus Marine Environment Monitoring Service (CMEMS) (http://marine.copernicus.eu/, SST_GLO_SST_L4_NRT_OBSERVATIONS_010_001 and SST_GLO_SST_L4_REP_OBSERVATIONS_010_011). Two model runs have been compared to the satellite values: the climate run as delivered to the Copernicus Climate Change Service - Monitoring and Forecasting Centre (C3S-MFC), which was driven by a downscaled general circulation model (GCM), and a separate run driven by reanalysis data (referred to below as the validation run).
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