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[1] 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...

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Bibliographic Details
Main Authors: Robert G. Striegl, Mark M. Dornblaser, George R. Aiken, Kimberly P. Wickl, Peter A. Raymond
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Subjects:
decades [Peterson et al
2002
Ye et al
2003
McClelland
Yukon
permafrost
Yukon river
Alaska
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.320.5426
http://water.usgs.gov/nrp/proj.bib/Publications/2007/striegl_dornblaser_etal_2007.pdf
Description
Summary:[1] 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; r 2 = 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.

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