Radiocarbon in dissolved organic carbon of the Atlantic Ocean

• Published in: Geophysical Research Letters
• Main Authors: Druffel, ERM, Griffin, S, Coppola, AI, Walker, BD
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: eScholarship, University of California 2016
• Subjects: Life Below Water; Meteorology & Atmospheric Sciences; North Atlantic; Southern Ocean
• Online Access: https://escholarship.org/uc/item/0wt2k6cr; https://escholarship.org/content/qt0wt2k6cr/qt0wt2k6cr.pdf; https://doi.org/10.1002/2016gl068746

Marine dissolved organic carbon (DOC) is produced in the surface ocean though its radiocarbon (14C) age in the deep ocean is thousands of years old. Here we show that ≥10% of the DOC in the deep North Atlantic is of postbomb origin and that the 14C age of the prebomb DOC is ≥4900 14C year, ~900 14C year older than previous estimates. We report 14C ages of DOC in the deep South Atlantic that are intermediate between values in the North Atlantic and the Southern Ocean. Finally, we conclude that prebomb DOC 14C ages are older and a portion of deep DOC is more dynamic than previously reported.