Dissolved Organic Radiocarbon In The Eastern Pacific And Southern Oceans

We report marine dissolved organic carbon (DOC) concentrations, and DOC Delta C-14 and delta C-13 values in seawater collected from the Southern Ocean and eastern Pacific GOSHIP cruise P18 in 2016/2017. The aging of C-14 in DOC in circumpolar deep water northward from 69 degrees S to 20 degrees N was similar to that measured in dissolved inorganic carbon in the same samples, indicating that the transport of deep waters northward is the primary control of C-14 in DIC and DOC. Low DOC increment C-14 and delta C-13 measurements between 1,200 and 3,400 m depth may be evidence of a source of DOC produced in nearby hydrothermal ridge systems (East Pacific Rise).