Natural Radiocarbon Activity of the Dissolved Organic Carbon in the North-east Pacific Ocean

Williams, Peter M.; Oeschger, H.; Kinney, Patrick

doi:10.1038/224256a0

Cited by 146 publications

(44 citation statements)

References 8 publications

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“…If an estimate of the N4C value for DOC in Pacific bottom waters is -400%0 (extrapolated from Williams et al [14]), then only 8% by weight DOC would be required to raise the N4C of SOC from -1000%o to -950%o.…”

Section: Isotopic Profilesmentioning

confidence: 99%

Variability of natural and bomb-produced radionuclide distributions in abyssal red clay sediments

Druffel

Williams

Livingston

et al. 1984

Earth and Planetary Science Letters

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Section: Isotopic Profilesmentioning

confidence: 99%

Variability of natural and bomb-produced radionuclide distributions in abyssal red clay sediments

Druffel

Williams

Livingston

et al. 1984

Earth and Planetary Science Letters

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“…Ultraviolet photooxidation (UVox) of seawater DOC for 14 C analysis has been used for decades; Williams et al (1969) were the first to report oceanic DOC 14 C results. Recently, there has been renewed interest in improving upon the UVox technique and several different UVox systems have been developed to address the oceanographic community's need for more DOC Δ 14 C measurements with small C blanks, small sample volumes, and high (>1 × per day) sample throughput (Beaupre et al 2007;Xue et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Effect of Acidified Versus Frozen Storage on Marine Dissolved Organic Carbon Concentration and Isotopic Composition

2016

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ABSTRACT. The standard procedure for storing/preserving seawater dissolved organic carbon (DOC) samples after field collection is by freezing (-20°C) until future analysis can be made. However, shipping and receiving large numbers of these samples without thawing presents a significant logistical problem and large monetary expense. Access to freezers can also be limited in remote field locations. We therefore test an alternative method of preserving and storing samples for the measurement of DOC concentrations ([DOC]), stable carbon (δ 13 C), and radiocarbon (as Δ 14 C) isotopic values via UV photooxidation (UVox). We report a total analytical reproducibility of frozen DOC samples to be [DOC] ± 1.3 µM, Δ 14 C ± 9.4‰, and δ 13 C ± 0.1‰, comparable to previously reported results (Druffel et al. 2013). Open Ocean DOC frozen versus acidified duplicates were on average offset by ΔDOC ± 1.1 µM, ΔΔ 14 C ± -1.3‰, and Δδ 13 C ± -0.1‰. Coastal Ocean frozen vs. acidified sample replicates, collected as part of a long-term (380-day) storage experiment, had larger, albeit consistent offsets of ΔDOC ± 2.2 µM, ΔΔ 14 C ± 1.5‰, and Δδ 13 C ± -0.2‰. A simple isotopic mass balance of changes in [DOC], Δ 14 C, and δ 13 C values reveals loss of semi-labile DOC (2.2 ± 0.6 µM, Δ 14 C = -94 ± 105‰, δ 13 C = -27 ± 10‰; n = 4) and semi-recalcitrant DOC (2.4 ± 0.7 µM, Δ 14 C = -478 ± 116‰, δ 13 C = -23.4 ± 3.0‰; n = 3) in Coastal and Open Ocean acidified samples, respectively.

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“…The large reservoir of DOC that accumulates in seawater is therefore believed to be largely unavailable to meet bacterial carbon demand (Kirchman et al, 1993;Carlson and Ducklow, 1995). Radiocarbon measurements of deep sea DOC support the view that a large fraction of DOC is recalcitrant (Williams et al, 1969, Williams and Druffel, 1987, Druffel et al, 1992.…”

Section: Introductionmentioning

confidence: 58%

Seqestration of dissolved organic carbon in the deep sea

Repeta¹

2006

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We used compound specific natural abundance radiocarbon analyses of neutral sugars to study carbon cycling of high molecular weight (HMW) dissolved organic carbon (DOC) at two sites in the North Pacific Ocean. Sugars released from HMWDOC by acid hydrolysis were purified by high-pressure liquid chromatography and analyzed for radiocarbon content via accelerator mass spectrometry. We find the seven most

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Natural Radiocarbon Activity of the Dissolved Organic Carbon in the North-east Pacific Ocean

Cited by 146 publications

References 8 publications

Variability of natural and bomb-produced radionuclide distributions in abyssal red clay sediments

Variability of natural and bomb-produced radionuclide distributions in abyssal red clay sediments

Effect of Acidified Versus Frozen Storage on Marine Dissolved Organic Carbon Concentration and Isotopic Composition

Seqestration of dissolved organic carbon in the deep sea

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