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Temporal Variability of Dissolved Organic Radiocarbon in the Deep North Pacific Ocean

  • Ellen R M Druffel (a1), Sheila Griffin (a1), Ning Wang (a1) (a2) and Brett D Walker (a1)
Abstract

We report marine dissolved organic carbon (DOC) ∆14C from seawater collected from the North central Pacific Ocean (NCP) in 2015. These measurements show DOC ∆14C values averaged –235±5‰ (n=3) in the mixed layer (24–81 m) and –544±5‰ (n=5) in the deep water (1500–5139 m). A comparison of these data with two previously published DOC ∆14C profiles from the NCP in 1985 and 1987 reveals that deep DOC ∆14C values have decreased. We discuss several possible mechanisms that could cause such a shift in DOC ∆14C values, including spatial inhomogeneity and temporal variability due to changes in the dissolution and ∆14C value of surface derived particles in the deep sea. We find that forthcoming profiles of DOC ∆14C results from the NCP will determine the primary mechanisms controlling deep DOC ∆14C distributions, and changes over the past three decades.

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*Corresponding author. Email: edruffel@uci.edu.
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Selected Papers from the 2nd Radiocarbon in the Environment Conference, Debrecen,Hungary, 3–7 July 2017

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References
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