Distribution of particulate organic carbon and nitrogen at an oceanic station in the central Pacific

Gordon, Donald C.

doi:10.1016/0011-7471(71)90098-2

Cited by 40 publications

(36 citation statements)

References 12 publications

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“…More recent work shows deep ocean averages closer to 10 pg liter-1 (e.g. Menzel 1967;Holm-Hansen 1969;Gordon 1971;this work). Near surface values are more variable and less easy to compare, but they were also probably overestimated in earlier work.…”

Section: Particulate Organic Carbonmentioning

confidence: 66%

“…The filters had been treated by baking at 500°C before samples were collected. The analyses were done in a carbon analyzer constructed by Wangersky (see Gordon 1969). Total organic carbon in O.l-ml samples of unfiltered seawater and of filtrates was determined by combustion at high temperature ( Sharp 1973).…”

Section: Methodsmentioning

confidence: 99%

“…In the subtropical North Pacific, Gordon ( 1971) found the particulate to be about 1% of the total organic carbon, He sampled seasonally from a single station at numerous depths. This Atlantic average and Gordon's Pacific average are listed in Table 2 along with an average from seasonal sampling in a nearshore North Pacific region (Fulton et al 1967) ; an average from sampling during summer melt in the shallow, nearshore Arctic Ocean (Loder 1971) ; and an average from a diatom culture in logarithmic growth phase (Sharp 1972 cific averages shown here to indicate real regional differences between the two oceans.…”

Section: Particulate Organic Carbonmentioning

confidence: 99%

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Size Classes of Organic Carbon in Seawater

Sharp

1973

Limnology & Oceanography

180

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Using carbon analyses, four size classes of organic matter in seawater are investigated. An appreciable portion of the organic matter is smaller than the usually defined particulate class, but is most probably not truly dissolved.This portion can be segrcgatcd usinlg very fine membrane filters and using membranes for forced dialysis.It is suggested that this "subparticulate" class should be considered as colloidal organic matter.

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Section: Particulate Organic Carbonmentioning

confidence: 66%

Section: Methodsmentioning

confidence: 99%

Section: Particulate Organic Carbonmentioning

confidence: 99%

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Size Classes of Organic Carbon in Seawater

Sharp

1973

Limnology & Oceanography

180

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“…This is though to be due to the fact that the planktonic OM at around 4 m was rather oxidized and decomposed at the time of deposition. A preferential loss of nitrogen relative to carbon during the decomposition of planktonic OM as it sank through the water column and settled down in the sediment results in an increase in the C/N (Gordon, 1971;Müller, 1977;Rosenfield, 1981;Saino and Hattori, 1987). As an example, at ocean depths of around 1000 m, C/N ratios have been found to be higher than 10, increasing to around 15 at greater depth (Müller, 1977).…”

Section: C/n Org Ratio Change By Preferential Decompositionmentioning

confidence: 99%

C/N ratios in a sediment core from Nakaumi Lagoon, southwest Japan. Usefulness as an organic source indicator.

2001

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The weight ratio of total organic carbon to total nitrogen (C/N ratio) in 20 meters of sediment core from Nakaumi Lagoon (coastal brackish lake), Japan is examined for its suitability as an organic source indicator. The C/N ratio depth profile is compared to the depth profiles of other proxies, i.e., weight ratio of total organic carbon to total organic nitrogen (C/N org. ratio), stanol compositions, n-alkane compositions and the hydrogen-index by Rock-Eval pyrolysis.The C/N ratios of the lagoonal sediments, which have been deposited over the last ca. 8,000 years, have a different profile from that of the C/N org. ratio and other proxies due to the effects of a constant level of inorganic nitrogen (N inorg. : ca. 0.04%) in the sediments. When C org. content is less than 1 wt%, the presence of N inorg. lowers the C/N ratio considerably, giving an inaccurate indication of organic source. C-N and C/N ratio-C org. plots are useful for evaluating the effect of N inorg. ; if the depth profiles of the C/N ratio and C org. content exhibit similar trends, this is taken as a warning that the apparent variation in the C/N ratio should be carefully examined in conjunction with the other plots and proxies. It is also found that the C/N org. ratio itself also tends to increase due to the preferential decomposition of nitrogen compounds, and that in sediments containing high proportions of planktonic organic matter (OM), the sensitivity of the C/N ratio to changes in the proportions of planktonic-terrestrial OM is relatively low. lignin phenols, are not easily analyzed due to chemical complexity. Hence, the C/N ratio, having recently become easier to obtain through the popularization of rapid elemental analysis techniques, appears to be an effective and simple indicator of organic source, particularly in lacustrine depositional environments, including estuaries.The C/N ratio in aquatic systems is governed by the mixing of terrestrial and autochthonous OM

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“…Studies of the geochemistry of organic carbon or carbonate equilibria and distribution in the water and sediments have been plagued by the analytical problems of accurately partitioning the total carbon between these two phases (Heath et al 1977;Boyce and Bode 1972;Gordon 1971;Gibbs 1977;Froelich 1980). Partitioning can be achieved in two ways.…”

Section: Limnolmentioning

confidence: 99%

Problems with accurate carbon measurements in marine sediments and particulate matter in seawater: A new approach1

Weliky

Suess

Ungerer

et al. 1983

Limnology & Oceanography

116

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The determination of carbon concentrations in marine sediments and particulate matter is hindered by the difficulty in analytically partitioning the total carbon between organic carbon and carbonate carbon phases. Attempts to “selectively” remove organic carbon by burning the sample at 500°C, or carbonate carbon by acidifying with HCl, usually affect the carbon of the remaining phase as well. A new approach permits direct measurement of both organic and carbonate carbon in a single sediment sample. The carbonate carbon concentration is determined from the CO2 evolved during phosphoric acid treatment. Subsequently, a concentrated dichromate/sulfuric acid solution is added to the remaining sediment‐acid mixture, and the CO2 liberated from the oxidation of organic carbon is measured. Total carbon is calculated as the sum of organic and carbonate carbon. A LECO carbon analyzer is modified so that the amount of CO2 evolved can be measured by the instrument’s thermal conductivity detector. In addition, total carbon content is determined on another subsample using the LECO dry combustion furnace. This provides a check on the values determined by the H3PO4/dichromate technique. Any other commercially available instrument relying on combustion furnace and thermal conductivity or infrared absorption for CO2 detection could be converted in an analogous manner.

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Distribution of particulate organic carbon and nitrogen at an oceanic station in the central Pacific

Cited by 40 publications

References 12 publications

Size Classes of Organic Carbon in Seawater

Size Classes of Organic Carbon in Seawater

C/N ratios in a sediment core from Nakaumi Lagoon, southwest Japan. Usefulness as an organic source indicator.

Problems with accurate carbon measurements in marine sediments and particulate matter in seawater: A new approach1

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