Primary productivity in the ocean is defined as the rate at which phytoplankton and other photosynthetic organisms fix inorganic carbon into organic matter through photosynthesis, which occurs specifically within the sunlit (euphotic) upper layer of the water column where sufficient light penetrates to support photosynthesis.
Ocean primary productivity is quantified as a rate (mass of carbon fixed per unit area per unit time, e.g., g C/m²/day), not a static amount,...
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