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Discussion papers | Copyright
https://doi.org/10.5194/amt-2018-150
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 22 Jun 2018

Research article | 22 Jun 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Technical Note: Possible errors in flux measurements due to limited digitalization

Thomas Foken1, Wolfgang Babel1,2, and Christoph Thomas1,2 Thomas Foken et al.
  • 1University of Bayreuth, Bayreuth Center of Ecology and Environmental Research (BayCEER), D-95440 Bayreuth, Germany
  • 2University of Bayreuth, Micrometeorology Group, D-95440 Bayreuth, Germany

Abstract. Recently reported trends of carbon dioxide uptakes pose the question if trends may results of the digitalization of gas analysers and sonic anemometers used in the 1990s. Simulating a 12-bit digitalization and the instrument error reported for the R2 and R3 sonic anemometers elsewhere, the influence of these deficits in comparison to the 16-bit digitalization were quantified. Both issues have an effect only on trace gas fluxes of small magnitude, mainly for the carbon rather than for the water vapour fluxes. The influence on the annual net ecosystem exchange is negligible.

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Recently reported trends of carbon dioxide uptakes pose the question if trends may results of the digitalization of gas analysers and sonic anemometers used in the 1990s. Simulating a 12-bit digitalization and the instrument error reported for the R2 and R3 sonic anemometers, the influence of these deficits in comparison to the 16-bit digitalization were quantified. The influence on the annual net ecosystem exchange is negligible, because, errors resulting from the gap filling are much larger.
Recently reported trends of carbon dioxide uptakes pose the question if trends may results of...
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