1995
DOI: 10.1016/0016-7037(94)00378-y
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Isotopic evidence for the contemporary origin of high-molecular weight organic matter in oceanic environments

Abstract: Abstract--Previous work has suggested that apparent old ~4C ages for oceanic DOC are the result of mixing of different organic carbon fractions. This report provides direct evidence for a contemporary ~4C age of a high-molecular-weight (HMW) fraction of colloidal organic carbon (-> 10 kD). Colloidal organic matter, COM~0 (from 10 kDaltons (kD) to 0.2/zm), isolated from the upper water column of the Gulf of Mexico and the Middle Atlantic Bight (MAB) region, generally has a contemporary age (i.e., younger than a… Show more

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Cited by 178 publications
(110 citation statements)
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“…DOC molecular size and composition can have a significant effect on DOC bioavailability [Amon and Benner, 1994]. Commonly described as the "size-reactivity continuum" hypothesis [Benner and Amon, 2015], this idea is consistent with the relatively small number of available observations, which show that high molecular weight (HMW) DOC has higher Δ 14 C values and lower molecular weight (LMW) DOC has lower Δ 14 C values [Guo et al, 1996 [Guo et al, 1996;Santschi et al, 1995]. Work by Loh et al [2004] also provided evidence that POC, HMW, and LMW DOC Δ 14 C decreases with size.…”
Section: Introductionsupporting
confidence: 59%
“…DOC molecular size and composition can have a significant effect on DOC bioavailability [Amon and Benner, 1994]. Commonly described as the "size-reactivity continuum" hypothesis [Benner and Amon, 2015], this idea is consistent with the relatively small number of available observations, which show that high molecular weight (HMW) DOC has higher Δ 14 C values and lower molecular weight (LMW) DOC has lower Δ 14 C values [Guo et al, 1996 [Guo et al, 1996;Santschi et al, 1995]. Work by Loh et al [2004] also provided evidence that POC, HMW, and LMW DOC Δ 14 C decreases with size.…”
Section: Introductionsupporting
confidence: 59%
“…So, half-life time of the fresh surface-active organic matter may be accounted less than few months. It is known that macromolecular dissolved organic matter cycles rapidly in coastal regions (Santschi et al, 1995). A fluorescence study of both marine and freshwater samples showed that organic matter freshly excreted by algae may be partially remineralized, but a fraction of the degraded products may be transformed into humic-like matter (Parlanti et al, 2000).…”
Section: Determination Of the Relative Acidity Of The Sasmentioning
confidence: 99%
“…Although low molecular weight organic compounds make up the majority of dissolved organic matter a significant amount is composed of macromolecules (Guo et al, 1995). Recent studies have shown that marine colloids are mostly composed of macromolecules and are mostly organic in nature (Guo & Santschi, 1997).…”
Section: Determination Of the Relative Acidity Of The Sasmentioning
confidence: 99%
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“…Dissolved organic nitrogen (DON) has also been suggested to accumulate seasonally in estuaries (Bronk, 2002;Bronk et al, 1998;Lomas et al, 2002). Radiocarbon measurements of estuarine, continental shelf, and slope DOM indicate that the large pool of >10 kDa DOM is relatively young and has a residence time of 1-30 days, whereas the smaller pool of 1-10 kDa DOM is between 380 and 4500 years old (Santschi et al, 1995). These observations suggest that autochthonous estuarine DOM production plays an important role in estuarine biogeochemistry.…”
Section: Introductionmentioning
confidence: 99%