Articles | Volume 14, issue 6
Biogeosciences, 14, 1603–1616, 2017
https://doi.org/10.5194/bg-14-1603-2017
Biogeosciences, 14, 1603–1616, 2017
https://doi.org/10.5194/bg-14-1603-2017

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, https://doi.org/10.5281/zenodo.438015, 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, https://doi.org/10.1046/j.1365-2389.1998.4940701.x, 1998.
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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.
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