Abstract
The rates of organic carbon oxidation by O 2, NO 3 −, MnO 2, Fe 2O 3 and SO 4 − have been calculated for five pelagic Pacific and Atlantic sites using simple diffusion-reaction models. O 2 everywhere oxidizes > 90% of the raining C org; the fraction oxidized by the secondary oxidants decreases as the rain rate of organic C to the seafloor decreases. A large fraction of the C org escaping oxidation by O 2 is oxidized by the secondary oxidants. Hence while these oxidants play a small role in remineralization, they are important in regulating the burial of organic matter and the consequent removal from the oceans of reduced carbon and nutrients.
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