Dissolved Organic Radiocarbon in the West Indian Ocean
Dissolved Organic Radiocarbon in the West Indian Ocean
Date
2023-10-02
Authors
Druffel, Ellen R. M.
Lewis, Christian B.
Griffin, Sheila
Flaherty, Alessandra
Rudresh, Megha
Hauksson, Niels E.
Key, Robert M.
McNichol, Ann P.
Hwang, Jeomshik
Walker, Brett D.
Lewis, Christian B.
Griffin, Sheila
Flaherty, Alessandra
Rudresh, Megha
Hauksson, Niels E.
Key, Robert M.
McNichol, Ann P.
Hwang, Jeomshik
Walker, Brett D.
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DOI
10.1029/2023gl104732
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Keywords
Carbon cycle
Dissolved organic carbon
DOC
Radiocarbon
14C
13C
Circumpolar deep water
Hydrothermal system
Dissolved organic carbon
DOC
Radiocarbon
14C
13C
Circumpolar deep water
Hydrothermal system
Abstract
We report marine dissolved organic carbon (DOC) concentrations, and DOC Δ14C and δ13C in seawater collected from the West Indian Ocean during the GO-SHIP I07N cruise in 2018. We find bomb 14C in DOC from the upper 1,000 m of the water column. There is no significant change in ∆14C of DOC in deep water northward, unlike that of dissolved inorganic carbon (DIC), suggesting that transport of deep water northward is not controlling the 14C age of DOC. Variability of DOC ∆14C, including high values in the deep waters, is more pronounced than in other oceans, suggesting that dissolution of surface derived particulate organic carbon is a source of modern carbon to deep DOC in the West Indian Ocean. Low δ13C are present at two of the five stations studied, suggesting a source of low δ13C DOC, or additional microbial utilization of deep DOC.
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© The Author(s), 2023. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Druffel, E., Lewis, C., Griffin, S., Flaherty, A., Rudresh, M., Hauksson, N., Key, R., McNichol, A., Hwang, J., & Walker, B. (2023). Dissolved Organic Radiocarbon in the West Indian Ocean. Geophysical Research Letters, 50(19), e2023GL104732, https://doi.org/10.1029/2023gl104732.
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Druffel, E., Lewis, C., Griffin, S., Flaherty, A., Rudresh, M., Hauksson, N., Key, R., McNichol, A., Hwang, J., & Walker, B. (2023). Dissolved Organic Radiocarbon in the West Indian Ocean. Geophysical Research Letters, 50(19), e2023GL104732.
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