Young organic matter as a source of carbon dioxide outgassing from Amazonian rivers

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Rivers are generally supersaturated with respect to carbon dioxide, resulting in large gas evasion fluxes that can be a significant component of regional net carbon budgets. Amazonian rivers were recently shown to outgas more than ten times the amount of carbon exported to the ocean in the form of total organic carbon or dissolved inorganic carbon. High carbon dioxide concentrations in rivers originate largely from in situ respiration of organic carbon, but little agreement exists about the sources or turnover times of this carbon. Here we present results of an extensive survey of the carbon isotope composition ({sup 13}C and ... continued below

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PDF-file: 35 pages; size: 1.1 Mbytes

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Mayorga, E; Aufdenkampe, A K; Masiello, C A; Krusche, A V; Hedges, J I; Quay, P D et al. June 23, 2005.

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Rivers are generally supersaturated with respect to carbon dioxide, resulting in large gas evasion fluxes that can be a significant component of regional net carbon budgets. Amazonian rivers were recently shown to outgas more than ten times the amount of carbon exported to the ocean in the form of total organic carbon or dissolved inorganic carbon. High carbon dioxide concentrations in rivers originate largely from in situ respiration of organic carbon, but little agreement exists about the sources or turnover times of this carbon. Here we present results of an extensive survey of the carbon isotope composition ({sup 13}C and {sup 14}C) of dissolved inorganic carbon and three size-fractions of organic carbon across the Amazonian river system. We find that respiration of contemporary organic matter (less than 5 years old) originating on land and near rivers is the dominant source of excess carbon dioxide that drives outgassing in mid-size to large rivers, although we find that bulk organic carbon fractions transported by these rivers range from tens to thousands of years in age. We therefore suggest that a small, rapidly cycling pool of organic carbon is responsible for the large carbon fluxes from land to water to atmosphere in the humid tropics.

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PDF-file: 35 pages; size: 1.1 Mbytes

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  • Journal Name: Nature; Journal Volume: 436

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  • Report No.: UCRL-JRNL-213773
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 881063
  • Archival Resource Key: ark:/67531/metadc885790

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  • June 23, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 2, 2016, 6:48 p.m.

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Mayorga, E; Aufdenkampe, A K; Masiello, C A; Krusche, A V; Hedges, J I; Quay, P D et al. Young organic matter as a source of carbon dioxide outgassing from Amazonian rivers, article, June 23, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc885790/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.