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Chemical Characteristics and Origin of Dissolved Organic Matter in the Yukon River

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Abstract

Monthly (or bi-weekly) water samples were collected from the Yukon River, one of the largest rivers in North America, at a station near the US Geological Survey Stevens Village hydrological station, Alaska from May to September 2002, to examine the quantity and quality of dissolved organic matter (DOM) and its seasonal variations. DOM was further size fractionated into high molecular weight (HMW or colloidal, 1 kDa–0.45 μm) and low molecular weight (LMW, <1 kDa) fractions. Dissolved organic carbon (DOC), colored dissolved organic matter (C-DOM) and total dissolved carbohydrate (TCHO) species were measured in the size fractionated DOM samples. Concentrations of DOC were as high as 2830 μmol-C l−1 during the spring breakup in May and decreased significantly to 508–558 μmol-C l−1 during open-water season (June–September). Within the DOC pool, up to 85% was in the colloidal fraction (1 kDa–0.45 μm) in early May. As DOC concentration decreased, this colloidal portion remained high (70–85% of the bulk DOC) throughout the sampling season. Concentrations of TCHO, including monosaccharides (MCHO) and polysaccharides (PCHO), varied from 722 μmol-C l−1 in May to 129 μmol-C l−1 in September, which comprised a fairly constant portion of bulk DOC (24±2%). Within the TCHO pool, the MCHO/TCHO ratio consistently increased from May to September. The C-DOM/DOM ratio and the size fractionated DOM increased from May to September, indicating that DOM draining into the Yukon River contained increased amounts of humified materials, likely related to a greater soil leaching efficiency in summer. The average composition of DOM was 76% pedogenic humic matter and 24% aquagenic CHO. Characteristics of soil-derived humic substances and low chlorophyll-a concentrations support a dominance of terrestrial DOM in Yukon River waters.

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  1. Céline Guéguen

    Present address: Earth and Ocean Sciences, University of British Columbia, Vancouver, V6T 1Z4, BC

Authors and Affiliations

  1. International Arctic research Center, University of Alaska Fairbanks, Fairbanks, AK, 99775, USA

    Céline Guéguen, Laodong Guo, Deli Wang & Noriyuki Tanaka

  2. Laboratory for Oceanographic and Environmental Research, Department of Oceanography, Texas A&M University, 5007 Ave. U, Galveston, TX, 77551, USA

    Chin-Chang Hung

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  1. Céline Guéguen
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Correspondence to Céline Guéguen.

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Guéguen, C., Guo, L., Wang, D. et al. Chemical Characteristics and Origin of Dissolved Organic Matter in the Yukon River. Biogeochemistry 77, 139–155 (2006). https://doi.org/10.1007/s10533-005-0806-1

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