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- W2890354952 abstract "Abstract The global ocean contains a massive reservoir of dissolved organic carbon (DOC), rivaling the atmosphere's pool of CO 2 . The most recalcitrant fractions have mean radiocarbon ages of ~4,000 years in the Atlantic to ~6,000 years in the Pacific. Knowing the radiocarbon signatures of DOC and the molecular composition of dissolved organic matter (DOM) is crucial to develop understanding of the persistence and lifetime of the DOC pool. In this research, we collected samples from the deep North Pacific in August 2013 (aboard the RV Melville ) to couple the Δ 14 C content of solid‐phase‐extracted DOM (Δ 14 C‐SPE‐DOM) with its molecular composition in the ocean's oldest deep waters. We find that deep waters in this region held a mean Δ 14 C‐SPE‐DOM value of −554 ± 9‰ (~6,400 14 C years), substantially more depleted than that in the deep Atlantic, which held a mean Δ 14 C‐SPE‐DOM value of −445 ± 5‰. While we find a more degraded molecular composition of DOM in the deep Pacific than the deep Atlantic, the molecular formulae within the Island of Stability (Lechtenfeld et al., 2014, https://doi.org/10.1016/j.gca.2013.11.009 ), are largely retained. These results imply that a fraction of deep DOM is resistant to removal and present in both the deep Atlantic and Pacific Oceans." @default.
- W2890354952 created "2018-09-27" @default.
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- W2890354952 date "2018-10-01" @default.
- W2890354952 modified "2023-09-29" @default.
- W2890354952 title "Aging and Molecular Changes of Dissolved Organic Matter Between Two Deep Oceanic End-Members" @default.
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- W2890354952 doi "https://doi.org/10.1029/2017gb005854" @default.
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