Dissolved Organic Radiocarbon in the Eastern Pacific and Southern Oceans
Ellen R. M. Druffel, Sheila Griffin, Christian B. Lewis, Megha Rudresh, Noreen Garcia, Robert M. Key, Ann P. McNichol, Niels E. Hauksson, Brett D. Walker
Abstract
Abstract We report marine dissolved organic carbon (DOC) concentrations, and DOC Δ 14 C and δ 13 C values in seawater collected from the Southern Ocean and eastern Pacific GOSHIP cruise P18 in 2016/2017. The aging of 14 C in DOC in circumpolar deep water northward from 69°S to 20°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 14 C in DIC and DOC. Low DOC ∆ 14 C and δ 13 C 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).