Estimates of ocean net primary production (NPP) "At this time, Standard Products are based on the original description of the Vertically Generalized Production Model (VGPM) ( Behrenfeld & Falkowski 1997a), MODIS surface chlorophyll concentrations (Chlsat), MODIS sea surface temperature data (SST), and MODIS cloud-corrected incident daily photosynthetically active radiation (PAR)."
National Center for Atmospheric Research Staff (Eds). Last modified 06 Aug 2014. "The Climate Data Guide: Ocean Productivity: Phytoplankton size estimates (satellite)." Retrieved from https://climatedataguide.ucar.edu/climate-data/ocean-productivity-phytoplankton-size-estimates-satellite.