Fig 3. Parameterization of optimal salinity and salinity tolerance in the salinity response function. The cumulative GPP for 2018 was tested with three sets of parameters (optimal salinity = 0, salinity tolerance = 18, blue; optimal salinity = 0, salinity tolerance = 20, orange; and optimal salinity = -5, salinity tolerance = 22, green) and compared to measured GPP (a). The modeled daily noon GPP rates were compared to the measured daily noon GPP rates using the same three parameter sets (b).