Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Journal topic
Volume 11, issue 15
Biogeosciences, 11, 4225–4233, 2014
https://doi.org/10.5194/bg-11-4225-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Towards a full GHG balance of the biosphere

Biogeosciences, 11, 4225–4233, 2014
https://doi.org/10.5194/bg-11-4225-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 12 Aug 2014

Research article | 12 Aug 2014

Comparison of floating chamber and eddy covariance measurements of lake greenhouse gas fluxes

E. Podgrajsek1, E. Sahlée1, D. Bastviken2, J. Holst3, A. Lindroth3, L. Tranvik4, and A. Rutgersson1 E. Podgrajsek et al.
  • 1Uppsala University, Dept. of Earth Sciences, Air, Water and Landscape Sciences, Uppsala, Sweden
  • 2Linköping University, Dept. of Thematic Studies – Water and Environmental Studies, Linköping, Sweden
  • 3Lund University, Dept. of Physical Geography and Ecosystem Science, Lund, Sweden
  • 4Uppsala University, Dept. of Ecology and Genetics, Limnology, Uppsala, Sweden

Abstract. Fluxes of carbon dioxide (CO2) and methane (CH4) from lakes may have a large impact on the magnitude of the terrestrial carbon sink. Traditionally lake fluxes have been measured using the floating chamber (FC) technique; however, several recent studies use the eddy covariance (EC) method. We present simultaneous flux measurements using both methods at lake Tämnaren in Sweden during field campaigns in 2011 and 2012. Only very few similar studies exist. For CO2 flux, the two methods agree relatively well during some periods, but deviate substantially at other times. The large discrepancies might be caused by heterogeneity of partial pressure of CO2 (pCO2w) in the EC flux footprint. The methods agree better for CH4 fluxes. It is, however, clear that short-term discontinuous FC measurements are likely to miss important high flux events.

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