Technical Note: Algal Pigment Index 2 in the Atlantic off the Southwest Iberian Peninsula: standard and regional algorithms
Creators
- 1. Centre for Marine and Environmental Research, FCT, University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
- 2. University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
- 3. Bio-Optika, Crofters, Gunnislake, UK
- 4. Norwegian Institute for Air Research-IMPEC, Box 100, 2027 Kjeller, Norway
Description
Abstract
In this study, Algal Pigment Index 2 (API2) is investigated in Sagres, an area located in the Atlantic off the southwestern Iberian Peninsula. Standard results provided by MEdium Resolution Image Spectrometer (MERIS) ocean color sensor were compared with alternative data products, determined through a regional inversion scheme, using both MERIS and in situ remote sensing reflectances (Rrs) as input data. The reference quantity for performance assessment is in situ total chlorophyll a (TChla) concentration estimated through phytoplankton absorption coefficient (i.e., equivalent to API2). Additional comparison of data products has also been addressed to TChla concentration determined by High Performance Liquid Chromatography. The MERIS matchup analysis revealed a systematic underestimation of TChla, which was confirmed with an independent comparison of product maps analysis. The study demonstrates the importance of regional algorithms for the study area that could complement upcoming standard results of the present Sentinel-3/OLCI space mission.
Files
Goela_et_al_2016.pdf
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