Reference : High-frequency correction method for CO2 and water vapour fluxes: an application on W...
Reports : Internal report
Life sciences : Environmental sciences & ecology
High-frequency correction method for CO2 and water vapour fluxes: an application on Walloon Terrestrial Observatories data
De Ligne, Anne mailto [Université de Liège > Ingénierie des biosystèmes (Biose) > Echanges Ecosystèmes - Atmosphère >]
Gembloux Agro-Bio Tech
[en] eddy covariance ; high frenquency correction ; co-spectrum
[en] High frequency concentration fluctuations are attenuated by the eddy covariance (EC) sensors system. This is due to an inability of the EC system to process eddies of small size and induces an underestimation of the fluxes. The two main reasons are the fluid frictions through the inlet tube of the gas analyzer and the separation of the sensors position between the center of the anemometer and the inlet tube. A correction factor is then needed for CO2 and H2O fluxes.
In this study, we describe a new procedure for the high frequency correction (HFC). This new HFC is applied for the CO2 and H2O fluxes measured at Vielsalm and Lonzée since their setup. Finally, we compare the former and updated corrected fluxes of these two sites which are part of the Terrestrial Observatories of Belgium. Both Observatories are included in the European ecosystem network of ICOS.

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