Preprints
https://doi.org/10.5194/amt-2021-249
https://doi.org/10.5194/amt-2021-249

  30 Aug 2021

30 Aug 2021

Review status: this preprint is currently under review for the journal AMT.

Importance of the WPL correction for the measurement of small CO2 fluxes

Katharina Jentzsch1, Julia Boike1,2, and Thomas Foken3 Katharina Jentzsch et al.
  • 1Alfred Wegener Institute, Telegrafenberg A6, D-14473 Potsdam, Germany
  • 2Geography Department, Humboldt-Universität zu Berlin, D-12489 Berlin, Germany
  • 3University of Bayreuth, Bayreuth Center of Ecology and Environmental Research (BayCEER), D-95440 Bayreuth, Germany

Abstract. The WPL (Webb, Pearman, and Leuning) correction is fully accepted to correct trace gas fluxes like CO2 for density fluctuations due to water vapor and temperature fluctuations for open-path gas analysers. It is known that this additive correction can be in the order of magnitude of the actual flux. However, this is hardly ever included in the analysis of data quality. An example from the Arctic shows the problems, because the size of the correction is a multiple of the actual flux. As a general result, we examined and tabulated the magnitude of the WPL correction for carbon dioxide flux as a function of sensible and latent heat flux. Furthermore, we propose a parameter to better estimate possible deficits in data quality and recommend integrating the quality flag derived with this parameter into the general study of small carbon dioxide fluxes.

Katharina Jentzsch et al.

Status: open (until 06 Oct 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-249', George Burba, 01 Sep 2021 reply
  • RC2: 'Comment on amt-2021-249', George Burba, 01 Sep 2021 reply
  • RC3: 'Comment on amt-2021-249', Anonymous Referee #2, 04 Sep 2021 reply

Katharina Jentzsch et al.

Katharina Jentzsch et al.

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Short summary
Very small CO2 fluxes are measured at night and in Arctic regions, for example. Under these conditions, if the sensible heat flux is not close to zero, the WPL correction will take values in the order of the flux. For these cases, a special quality control is proposed.