Method |
Carnegie-Ames-Stanford approach (CASA) for land and the Vertically Generalized Production Model (VGPM) for the oceans. Calculated from long term global measurements from satellites according to model integrated from 3 equations: (1) NPP=APARXepsilon. APAR-Absorbed Phosynthetically Active solar Radiation. epsilon-effective photon yield for growth. (2) NPP=f(NDVI)XPAR3Xepsilon*Xg(T)Xh(W). NDVI-normalized difference vegetation index. PAR-downwelling Phosynthetically Active solar Radiation. epsilon-as in (1), adjusted by functions that account for effects of temperature g(T) and water h(W) stress. equation (3) NPP=CsatXZeuXf(PAR)XPb,opt(T) where Csat is the satellite-derived, near-surface phytoplankton chlorophyll concentration (in milligrams per cubic meter), Zeu is the depth (in meters) to which light is sufficient to support positive NPP, f(PAR) describes the fraction of the water column from the surface to Zeu in which photosynthesis is light saturated, and Pb,opt(T) is the maximum, chlorophyll-specific carbon fixation rate (in milligrams of C per milligram of chlorophyll per day), estimated as a function of sea-surface temperature. |