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The quantitative importance of northern lakes in terrestrial carbon budgets is uncertain, as year-round observations of carbon fluxes are rare. We measured CH4 and CO2 fluxes from a subarctic lake and nearby fen during 2.5 years with one eddy covariance system. We identified drivers of seasonal variability in lake fluxes and show the importance of winter and spring for annual carbon exchange in both ecosystems. The lake as a source of atmospheric carbon partially compensates the fen carbon sink.
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Articles | Volume 14, issue 22
Biogeosciences, 14, 5189–5216, 2017
https://doi.org/10.5194/bg-14-5189-2017

Special issue: Interactions between climate change and the Cryosphere: SVALI,...

Biogeosciences, 14, 5189–5216, 2017
https://doi.org/10.5194/bg-14-5189-2017

Research article 21 Nov 2017

Research article | 21 Nov 2017

Year-round CH4 and CO2 flux dynamics in two contrasting freshwater ecosystems of the subarctic

Mathilde Jammet et al.

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Cited articles

Åkerman, H. J. and Johansson, M.: Thawing permafrost and thicker active layers in sub-arctic Sweden, Permafrost Periglac., 19, 279–292, https://doi.org/10.1002/ppp.626, 2008.
Algesten, G., Sobek, S., Bergström, A.-K., Ågren, A., Tranvik, L. J., and Jansson, M.: Role of lakes for organic carbon cycling in the boreal zone, Glob. Change Biol., 10, 141–147, https://doi.org/10.1111/j.1365-2486.2003.00721.x, 2004.
Anderson, D. E., Striegl, R. G., Stannard, D. I., Michmerhuizen, C. M., McConnaughey, T. A., and LaBaugh, J. W.: Estimating lake-atmosphere CO2 exchange, Limnol. Oceanogr., 44, 988–1001, 1999.
Aubinet, M., Vesala, T., and Papale, D. (Eds.): Eddy Covariance, Springer Netherlands, Dordrecht, available at: http://link.springer.com/10.1007/978-94-007-2351-1 (last access: 24 September 2014), 2012.
Bäckstrand, K., Crill, P. M., Jackowicz-Korczyñski, M., Mastepanov, M., Christensen, T. R., and Bastviken, D.: Annual carbon gas budget for a subarctic peatland, Northern Sweden, Biogeosciences, 7, 95–108, https://doi.org/10.5194/bg-7-95-2010, 2010.
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Short summary
The quantitative importance of northern lakes in terrestrial carbon budgets is uncertain, as year-round observations of carbon fluxes are rare. We measured CH4 and CO2 fluxes from a subarctic lake and nearby fen during 2.5 years with one eddy covariance system. We identified drivers of seasonal variability in lake fluxes and show the importance of winter and spring for annual carbon exchange in both ecosystems. The lake as a source of atmospheric carbon partially compensates the fen carbon sink.
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