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AGU: Geophysical Research Letters

 

Keywords

  • DOC
  • boreal
  • carbon

Index Terms

  • Biogeosciences: Biogeochemical kinetics and reaction modeling
  • Cryosphere: Permafrost
  • Hydrology: Chemistry of fresh water
  • Hydrology: Frozen ground
  • Oceanography: Biological and Chemical: Carbon cycling

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 33, L23401, 5 PP., 2006
doi:10.1029/2006GL028222

Seasonal changes in the age and structure of dissolved organic carbon in Siberian rivers and streams

J. C. Neff

Geological Sciences and Environmental Studies, University of Colorado, Boulder, Colorado, USA

J. C. Finlay

Department of Ecology, Evolution and Behavior, University of Minnesota, St. Paul, Minnesota, USA

S. A. Zimov

North-East Scientific Station, Pacific Institute of Geography, Far East Branch of the Russian Academy of Sciences, Cherskii, Russia

S. P. Davydov

North-East Scientific Station, Pacific Institute of Geography, Far East Branch of the Russian Academy of Sciences, Cherskii, Russia

J. J. Carrasco

Geological Sciences and Environmental Studies, University of Colorado, Boulder, Colorado, USA

E. A. G. Schuur

Department of Botany, University of Florida, Gainesville, Florida, USA

A. I. Davydova

North-East Scientific Station, Pacific Institute of Geography, Far East Branch of the Russian Academy of Sciences, Cherskii, Russia

We examined the age and structural composition of dissolved organic carbon (DOC) transported in the Kolyma River, two large tributaries and several small upland and lowland streams in 2003. The sampling took place under ice through the winter and included the spring flood period. Radiocarbon measurements of the DOC indicated that the bulk of the annual DOC flux was modern in origin (Δ14C > 100‰) and pyrolysis-gas chromatography/mass spectroscopy techniques showed high concentration of terrestrial lignin monomers consistent with vigorous leaching of surface horizons during the spring thaw. By September 2003 however, little terrestrial lignin was present and the radiocarbon age became significantly older (Δ14C < 0‰) indicating that the mechanism of DOC generation transitions from surface to deeper soils or other terrestrial sources of old, previously stabilized C.

Received 21 September 2006; accepted 1 November 2006; published 6 December 2006.

Citation: Neff, J. C., J. C. Finlay, S. A. Zimov, S. P. Davydov, J. J. Carrasco, E. A. G. Schuur, and A. I. Davydova (2006), Seasonal changes in the age and structure of dissolved organic carbon in Siberian rivers and streams, Geophys. Res. Lett., 33, L23401, doi:10.1029/2006GL028222.

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