75daa714-09af-4732-930d-a4cd599ad591 Sextant Ifremer ZI Pointe du Diable Plouzane Brittany 29280 France sextant@ifremer.fr https://sextant.ifremer.fr/eng pointOfContact 2025-05-15T22:54:39.607531Z ISO 19115-3 - SEXTANT 1.0 Photosynthetic rates derived from satellite-based chlorophyll concentration 2003-12-22 publication 75daa714-09af-4732-930d-a4cd599ad591 We assembled a dataset of 14C-based productivity measurements to understand the critical variables required for accurate assessment of daily depth-integrated phytoplankton carbon fixation (PP(PPeu)u) from measurements of sea surface pigment concentrations (Csat)(Csat). From this dataset, we developed a light-dependent, depth-resolved model for carbon fixation (VGPM) that partitions environmental factors affecting primary production into those that influence the relative vertical distribution of primary production (Pz)z) and those that control the optimal assimilation efficiency of the productivity profile (P(PBopt). The VGPM accounted for 79% of the observed variability in Pz and 86% of the variability in PPeu by using measured values of PBopt. Our results indicate that the accuracy of productivity algorithms in estimating PPeu is dependent primarily upon the ability to accurately represent variability in Pbopt. We developed a temperature-dependent Pbopt model that was used in conjunction with monthly climatological images of Csat sea surface temperature, and cloud-corrected estimates of surface irradiance to calculate a global annual phytoplankton carbon fixation (PPannu) rate of 43.5 Pg C yr‒1. The geographical distribution of PPannu was distinctly different than results from previous models. Our results illustrate the importance of focusing Pbopt model development on temporal and spatial, rather than the vertical, variability. Oceanographic and Atmospheric Sciences Division (USA) Michael J. Behrenfeld Oceanographic and Atmospheric Sciences Division, Brookhaven National Laboratory United States behrenfm@science.oregonstate.edu author Paul G. Falkowski Oceanographic and Atmospheric Sciences Division, Brookhaven National Laboratory United States falko@marine.rutgers.edu author Knut Yngve Børsheim Institute of Marine Research yngve.borsheim@hi.no pointOfContact https://sextant.ifremer.fr/geonetwork/srv/api/records/75daa714-09af-4732-930d-a4cd599ad591/attachments/222_Net%20Primary%20Production.jpg Thèmes Sextant 2023-03-16 publication geonetwork.thesaurus.local.theme.sextant-theme GEMET - INSPIRE themes, version 1.0 2018-07-27 publication geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Article Mission Atlantic - Resources 2023-03-16 publication geonetwork.thesaurus.local.theme.mission-atlantic-resources Norwegian Sea Atlantic Ocean Mission Atlantic - Case Studies 2023-03-16 publication geonetwork.thesaurus.local.theme.mission-atlantic-case-studies /Cross-discipline/Rate measurements /Biological oceanography/Phytoplankton and microphytobenthos Mission Atlantic - BODC Parameters 2023-03-16 publication geonetwork.thesaurus.local.theme.mission-atlantic-bodc-parameters Modelling data Mission Atlantic - Data type (DMP) 2023-03-16 publication geonetwork.thesaurus.local.theme.mission-atlantic-data-type WP5 Assessing state, drivers and tipping points Mission Atlantic - Work Package 2023-03-16 publication geonetwork.thesaurus.local.theme.mission-atlantic-work-package No conditions apply grid utf8 oceans -180.00 180.00 -90.00 90.00 https://doi.org/10.4319/lo.1997.42.1.0001 DOI Photosynthetic rates derived from satellite-based chlorophyll concentration