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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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Atmos. Meas. Tech., 9, 1361-1367, 2016
http://www.atmos-meas-tech.net/9/1361/2016/
doi:10.5194/amt-9-1361-2016
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
31 Mar 2016
Dimensioning IRGA gas sampling systems: laboratory and field experiments
Marc Aubinet1, Lilian Joly2, Denis Loustau3, Anne De Ligne1, Henri Chopin1, Julien Cousin2, Nicolas Chauvin2, Thomas Decarpenterie2, and Patrick Gross4 1University of Liège, Gembloux Agro-Bio Tech, TERRA, Ecosystems – Atmosphere Exchanges, Liège, Belgium
2University of Reims, Groupe de Spectrométrie Moléculaire et Atmosphérique, Reims, France
3INRA, UMR ISPA, 33140 Villenave d'Ornon, France
4INRA, UMR EEF, 54280 Champenoux, France
Abstract. Both laboratory and field experiments were carried out in order to define suitable configuration ranges for the gas sampling systems (GSSs) of infrared gas analyzers (IRGAs) used in eddy covariance measurements.

In the laboratory, an original dynamic calibration bench was developed in order to test the frequency attenuation and pressure drop generated by filters. In the field, three IRGAs of the same type equipped with different filters or different rain caps were installed and run and the real frequency response of the complete setup was tested.

The main results are as follows.

– Filters may have a strong impact on the pressure drop in the GSS and this impact increases with flow rate.

– Conversely, no impact of the tested filters on cut-off frequency was found, GSSs with and without filters presenting similar cut-off frequencies.

– The main limiting factor of cut-off frequency in the field was found to be the rain cap design. In addition, the impact of this design on pressure drop was also found to be noteworthy.

Citation: Aubinet, M., Joly, L., Loustau, D., De Ligne, A., Chopin, H., Cousin, J., Chauvin, N., Decarpenterie, T., and Gross, P.: Dimensioning IRGA gas sampling systems: laboratory and field experiments, Atmos. Meas. Tech., 9, 1361-1367, doi:10.5194/amt-9-1361-2016, 2016.

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Short summary
Laboratory and field experiments were carried out in order to define suitable configuration ranges for the gas sampling systems of infrared gas analyzers used in eddy covariance measurements. They show that filters may have a strong impact on the pressure drop in the GSS but no significant impact on cut-off frequency. Conversely, the rain cup design was found to be the main limiting factor of cut-off frequency in the field. Its impact on pressure drop was also found to be noteworthy.
Laboratory and field experiments were carried out in order to define suitable configuration...
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