The global ocean is divided into biomes on the basis of SeaWiFS-derived chlorophyll-a concentration and particulate backscattering coefficients (as a proxy for biomass). Regional differences in the seasonal cycles of chlorophyll and phytoplankton biomass in carbon units elucidate differences in phytoplankton growth conditions. The underlying physical forcing which determines the extent of light and/or nutrient limitation is investigated using output from a prognostic biogeochemical model. Understanding the forcing behind variability in phytoplankton biomass, as well as chlorophyll, will inform predictions of how global primary production will respond to changing climate.
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