POSTER Session 2

COMPARING IN SITU AND SATELLITE-DERIVED PRIMARY PRODUCTION ESTIMATES IN THE CANARY CURRENT UPWELLING REGION

The Canary Current Eastern Boundary Upwelling Ecosystem (CanC-EBUE), unlike other EBUE, has been unabatedly warming, and experiencing either a decrease or no increase in wind intensity during the last 60 years. However, past trends in net primary production are uncertain, due to differences in the outputs of remote sensing models and the lack of in situ data to validate these models in the region. Here we compare net primary production (NPP) obtained from six widely-used models – the Vertically Generalized Production Model (VGPM) and its variant based on Eppley’s description of the growth function (Eppley-VGPM), the Carbon-based Production Model (CbPM), the Carbon, Absorption and Fluorescence Euphotic-resolving model (CAFE), the model developed by Smyth and colleagues in 2005 (S05), and the one developed by Sathyendranath and colleagues in 2020 (PSM)- with in situ primary production (PP) data. Together with chlorophyll a concentration (Chl) and phytoplankton biomass (B), we measured PP by 14C and 13C uptake, and oxygen evolution inside incubation bottles, along 11 stations across the transition zone expanding from the coastal upwelling to the open ocean waters at the Cape Verde Frontal Zone (17-23ºN; 16-26ºW). Although carbon and oxygen –based in situ PP estimates were frequently correlated, we found that only the Chl-based VGPMs were significantly correlated with in situ estimates, yet these are among the first-described models in the literature. Models based on B, however, did not correlate with in situ PP estimations, despite satellite-derived B presenting better correlations than Chl with the in situ data.

Nauzet Hernández Hernández, Universidad de Las Palmas de Gran Canaria, Spain, https://orcid.org/0000-0003-1503-4214

Yeray Santana-Falcón, CNRM, Université de Toulouse, Centre National de la Recherche Scientifique (CNRS), France, https://orcid.org/0000-0002-2627-1947

María F. Montero, Instituto de Oceanografía y Cambio Global (IOCAG), Universidad de Las Palmas de Gran Canaria (ULPGC), Spain, https://orcid.org/0000-0001-8124-8136

Mar Benavides, Aix Marseille Université, Université de Toulon, Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD), MIO UM, France, https://orcid.org/0000-0001-9502-108X

Xosé A. Álvarez-Salgado, Consejo Superior de Investigaciones Científicas – Instituto de Investigacións Mariñas, Spain, https://orcid.org/0000-0002-2387-9201

Antonio Delgado-Huertas, Instituto Andaluz de Ciencias de la Tierra (IACT-CSIC-UGR), Spain, https://orcid.org/0000-0002-7240-1570

Steve Groom, Plymouth Marine Laboratory, United Kingdom, https://orcid.org/0000-0002-0792-3241

Peter Land, Plymouth Marine Laboratory, United Kingdom, https://orcid.org/0000-0001-7518-8683

Javier Arístegui, Instituto de Oceanografía y Cambio Global (IOCAG), Universidad de Las Palmas de Gran Canaria (ULPGC), Spain, https://orcid.org/0000-0002-7526-7741

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