Dissolved organic radiocarbon in the eastern Pacific and Southern Oceans

• Published in: Geophysical Research Letters
• Main Authors: Druffel, Ellen R. M., Griffin, Sheila, Lewis, Christian B., Rudresh, Megha, Garcia, Noreen G., Key, Robert M., McNichol, Ann P., Hauksson, Niels E., Walker, Brett D.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: American Geophysical Union 2021
• Subjects: 13C; Carbon cycle; Circumpolar deep water; Dissolved inorganic carbon; Dissolved organic carbon; Radiocarbon; Canada; Kavli; Pacific; Southern Ocean
• Online Access: https://hdl.handle.net/1912/27523

Author Posting. © American Geophysical Union, 2021. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 48(10), (2021): e2021GL092904, https://doi.org/10.1029/2021GL092904. We report marine dissolved organic carbon (DOC) concentrations, and DOC Δ14C and δ13C values in seawater collected from the Southern Ocean and eastern Pacific GOSHIP cruise P18 in 2016/2017. The aging of 14C 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 14C in DIC and DOC. Low DOC ∆14C and δ13C 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). This work was supported by NSF (OCE-1458941 and OCE-1951073 to Ellen R. M. Druffel), Fred Kavli Foundation, Keck Carbon Cycle AMS Laboratory, NSF/NOAA funded GO-SHIP Program, Canada Research Chairs program (to Brett D. Walker) and American Chemical Society Petroleum Research Fund New Directions (55,430-ND2 to Ellen R. M. Druffel and Brett D. Walker). 2021-11-24