Articles | Volume 12, issue 4
Research article
25 Feb 2015
Research article |  | 25 Feb 2015

Uncertainty analysis of eddy covariance CO2 flux measurements for different EC tower distances using an extended two-tower approach

H. Post, H. J. Hendricks Franssen, A. Graf, M. Schmidt, and H. Vereecken

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Cited articles

Allard, V., Soussana, J.-F., Falcimagne, R., Berbigier, P., Bonnefond, J. M., Ceschia, E., D'hour, P., Hénault, C., Laville, P., Martin, C., and Pinarès-Patino, C.: The role of grazing management for the net biome productivity and greenhouse gas budget (CO2, N2O and CH4) of semi-natural grassland, Agricul. Ecosys. Environ., 121, 47–58, 2007.
Ammann, C., Flechard, C. R., Leifeld, J., Neftel, A., and Fuhrer, J.: The carbon budget of newly established temperate grassland depends on management intensity, Agricul. Ecosys. Environ., 121, 5–20, 2007.
Arbeitsgruppe BK50: Allgemeine Informationen zur Bodenkarte 1?, 50 000–55 000 (Geol. Dienst Nordrh.-Westf.), 2001.
Aubinet, M., Vesala, T., and Papale, D.: Eddy Covariance: A Practical Guide to Measurement and Data Analysis, Springer Verlag, 2011.
Baldocchi, D. D.: Assessing ecosystem carbon balance: problems and prospects of the eddy covariance technique, Ann. Rev. Ecol. Systemat., 33, 1–33, 2001.
Short summary
This study introduces an extension of the classical two-tower approach for uncertainty estimation of measured net CO2 fluxes (NEE). Because land surface properties cannot be assumed identical at two eddy covariance towers, a correction for systematic flux differences is proposed to be added to the classical weather filter. With this extension, the overestimation of NEE uncertainty due to systematic flux differences (which are assumed to increase with tower distance) can considerably be reduced.
Final-revised paper