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WATER RESOURCES RESEARCH,
VOL. 43,
W02411,
doi:10.1029/2006WR005201,
2007
Carbon export and cycling by the Yukon, Tanana, and Porcupine rivers, Alaska, 2001–2005
Robert G. Striegl
U.S. Geological Survey, Denver, Colorado, USA
Mark M. Dornblaser
U.S. Geological Survey, Boulder, Colorado, USA
George R. Aiken
U.S. Geological Survey, Boulder, Colorado, USA
Kimberly P. Wickland
U.S. Geological Survey, Boulder, Colorado, USA
Peter A. Raymond
School of Forestry and Environmental Studies, Yale University, New Haven, Connecticut, USA
Abstract
Loads and yields of dissolved and particulate organic and inorganic carbon (DOC, POC, DIC, PIC) were measured and modeled
at three locations on the Yukon River (YR) and on the Tanana and Porcupine rivers (TR, PR) in Alaska during 2001–2005. Total
YR carbon export averaged 7.8 Tg C yr−1, 30% as OC and 70% as IC. Total C yields (0.39–1.03 mol C m−2 yr−1) were proportional to water yields (139–356 mm yr−1; r2 = 0.84) at all locations. Summer DOC had an aged component (fraction modern (FM) = 0.94–0.97), except in the permafrost wetland-dominated
PR, where DOC was modern. POC had FM = 0.63–0.70. DOC had high concentration, high aromaticity, and high hydrophobic content
in spring and low concentration, low aromaticity, and high hydrophilic content in winter. About half of annual DOC export
occurred during spring. DIC concentration and isotopic composition were strongly affected by dissolution of suspended carbonates
in glacial meltwater during summer.
Received 25
May
2006;
accepted 6
November
2006;
published 10
February
2007.
Keywords: carbon export;
climate change;
Yukon River Basin.
Index Terms: 0428 Biogeosciences: Carbon cycling (4806); 1615 Global Change: Biogeochemical cycles, processes, and modeling (0412, 0414, 0793, 4805, 4912); 1806 Hydrology: Chemistry of fresh water; 1879 Hydrology: Watershed.
Read Full Article (file size: 576574 bytes) Cited by
Citation: Striegl, R. G., M. M. Dornblaser, G. R. Aiken, K. P. Wickland, and P. A. Raymond
(2007),
Carbon export and cycling by the Yukon, Tanana, and Porcupine rivers, Alaska, 2001–2005,
Water Resour. Res.,
43,
W02411,
doi:10.1029/2006WR005201.
This paper is not subject to U.S. copyright. Published in 2007 by the
American Geophysical Union.
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