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Integrating carbon emissions from lakes and streams in a subarctic catchment

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Author

  • Erik J. Lundin
  • Reiner Giesler
  • Andreas Persson
  • Megan S. Thompson
  • Jan Karlsson

Summary, in English

Northern inland waters emit CO2 and CH4 to the atmosphere but the importance of these emissions is poorly understood due to a lack of integrated catchment-scale estimates of carbon (C) emissions from lakes and streams. In this study we quantified the annual emission of CO2 and CH4 from 27 lakes and 23 stream segments in a 15km(2) subarctic catchment in northern Sweden. All lakes and streams were net sources of C to the atmosphere on an annual basis. Streams dominated (96%) the aquatic CO2 emission while lakes (61%) dominated the aquatic CH4 emission. Total aquatic C emission from the catchment was estimated to be 9.1gCm(-2)yr(-1) (98% as CO2). Although streams only accounted for 4% of the aquatic area in the catchment, they accounted for 95% of the total emission. The C emissions from lakes and streams were considerably larger than previously reported downstream waterborne export of C from the catchment, indicating that the atmospheric losses of C in the aquatic systems are an important component in the catchment C balance.

Publishing year

2013

Language

English

Pages

1200-1207

Publication/Series

Journal of Geophysical Research - Biogeosciences

Volume

118

Issue

3

Document type

Journal article

Publisher

Wiley

Topic

  • Physical Geography

Keywords

  • subarctic
  • streams
  • lakes
  • CO2
  • CH4
  • emission

Status

Published

ISBN/ISSN/Other

  • ISSN: 2169-8953