Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 48, Issue 10, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GL092904
Keywords
C-13; carbon cycle; circumpolar deep water; dissolved inorganic carbon; dissolved organic carbon; radiocarbon
Categories
Funding
- NSF [OCE-1458941, OCE-1951073]
- Fred Kavli Foundation
- Keck Carbon Cycle AMS Laboratory
- NSF/NOAA - GO-SHIP Program
- Canada Research Chairs program
- American Chemical Society Petroleum Research Fund New Directions [55,430-ND2]
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The study found that marine dissolved organic carbon concentrations in the Southern Ocean and eastern Pacific are primarily controlled by the transport of deep waters northward. Low DOC increment C-14 and delta C-13 measurements at specific depths may indicate a source of DOC from nearby hydrothermal ridge systems.
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).
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