Articles | Volume 14, issue 11
https://doi.org/10.5194/amt-14-7291-2021
https://doi.org/10.5194/amt-14-7291-2021
Research article
 | 
19 Nov 2021
Research article |  | 19 Nov 2021

Importance of the Webb, Pearman, and Leuning (WPL) correction for the measurement of small CO2 fluxes

Katharina Jentzsch, Julia Boike, and Thomas Foken

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Revised manuscript accepted for AMT
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Cited articles

Aubinet, M., Vesala, T., and Papale, D. (Eds.): Eddy covariance: A Practical Guide to Measurement and Data Analysis, Springer, Dordrecht, Heidelberg, London, New York, 438 pp., https://doi.org/10.1007/978-94-007-2351-1, 2012. 
Boike, J.: FLUXNET database, available at: http://www.europe-fluxdata.eu/;ID:Sj-Blv, last access: 17 November 2021. 
Burba, G., McDermitt, D. K., Grelle, A., Anderson, D. J., and Xu, L.: Addressing the influence of instrument surface heat exchange on the measurements of CO2 flux from open-path gas analyzers, Glob. Change Biol., 14, 1854–1876, https://doi.org/10.1111/j.1365-2486.2008.01606.x, 2008. 
Burba, G., Anderson, T., and Komissarov, A.: Accounting for spectroscopic effects in laser-based open-path eddy covariance flux measurements, Glob. Change Biol., 2019, 14614, https://doi.org/10.1111/gcb.14614, 2019. 
Foken, T.: Anmerkungen zur Problematik möglicher Fehler bei der Bestimmung turbulenter Austauschströme nach der Flux-Methode (Remarks on the problem of possible errors in the determination of turbulent exchange according to the flux method), Z. Meteorol., 39, 112–113, 1989. 
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Short summary
Very small CO2 fluxes are measured at night in Arctic regions. If the sensible heat flux is not close to zero under these conditions, the WPL correction will take values on the order of the flux. A special quality control is proposed for these cases.