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In this study, Algal Pigment Index 2 (API2) is investigated in Sagres, anarea located in the Atlantic off the southwestern Iberian Peninsula. Standardresults provided by the MEdium Resolution Image Spectrometer (MERIS) ocean coloursensor were compared with alternative data products, determined through aregional inversion scheme, using both MERIS and in situ remote sensingreflectances (Rrs) as input data. The reference quantityfor performance assessment is in situ total chlorophyll a(TChl a) concentration estimated through a phytoplankton absorptioncoefficient (i.e. equivalent to API2). Additional comparison of dataproducts has also been addressed for TChl a concentration determinedby high-performance liquid chromatography. The MERIS matchup analysisrevealed a systematic underestimation of TChl a, which was confirmedwith an independent comparison of product map analysis. The studydemonstrates the importance of regional algorithms for the study area thatcould complement upcoming standard results of the current Sentinel-3/OLCIspace mission

Technical note: Algal Pigment Index 2 in the Atlantic off the southwest Iberian Peninsula: standard and regional algorithms