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The pool of dissolved organic carbon (DOC) in the oceans is as large as all of the carbon in the atmosphere. Phytoplankton, which remove CO2 from the atmosphere and convert it into more complex carbon compounds, are the primary source of DOC in the ocean. New research has identified a crucial process behind the reason why DOC levels in the deep oceans are constant despite a continuous supply from the surface ocean. [Source: University of Southampton]
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