Articles | Volume 14, issue 6
Biogeosciences, 14, 1603–1616, 2017
Biogeosciences, 14, 1603–1616, 2017

Research article 28 Mar 2017

Research article | 28 Mar 2017

Overestimation of closed-chamber soil CO2 effluxes at low atmospheric turbulence

Andreas Brændholt et al.

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Cited articles

Anthony, W. H., Hutchinson, G. L., and Livingston, G. P.: Chamber measurement of soil-atmosphere gas exchange: linear vs diffusion-based flux models, Soil Sci. Soc. Am. J., 59, 1308–1310, 1995.
Brændholt, A., Steenberg Larsen, K., Ibrom, A., and Pilegaard, K.: Raw data for “Overestimation of closed-chamber soil CO2 effluxes at low atmospheric turbulence” [Data set], Zenodo,, 2017.
Brooks, J. R., Flanagan, L. B., Varney, G. T., and Ehleringer, J. R.: Vertical gradients in photosynthetic gas exchange characteristics and refixation of respired CO2 within boreal forest canopies, Tree Physiol., 17, 1–12, 1997.
Conen, F. and Smith, K. A.: A re-examination of closed flux chamber methods for the measurement of trace gas emissions from soils to the atmosphere, Eur. J. Soil Sci., 49, 701–707,, 1998.
Short summary
In this study we found that CO2 fluxes from soil measured by the closed-chamber technique were overestimated during low atmospheric turbulence. This resulted in biased courses of CO2 fluxes during a day. We removed CO2 fluxes measured at low turbulence, which gave better flux estimates. We furthermore tested a novel technique that provided good measurement during low turbulence, thereby giving better estimates of CO2 emissions from soils, which is a crucial part of the global carbon cycle.
Final-revised paper