Poster De Conférence Année : 2024

Application of in situ CO2 and CH4 concentrations measurements on-board UAV to monitor surface emissions on a grazed grassland, against ground-based Eddy Covariance

Application d'observations de concentrations de CO2 et CH4 à bord de drone pour la mesure d'émissions de surface d'une prairie pâturée, comparée à un système eddy covariance au sol

Pauline Buysse

Résumé

An open-path laser absorption spectrometer has been developed to measure in situ CO2 and CH4 concentrations on-board Uncrewed Aircraft Vehicles (UAV). Associated with a mass balance model, it proved suitable to detect and quantify point-source emissions with fluxes down to 0.01 g/s in industrial contexts (Bonne et al., AMTD, 2023). New developments were conducted on the instrument, including a newly embarked 2D ultrasonic anemometer, together with sensitivity and stability improvements. To explore potential new applications of this instrument to diffuse surface emissions with low concentrations enhancements and benchmark it against an already established Eddy-Covariance flux tower, a monitoring campaign has been conducted in 2024 on the grazed grassland at the FR-Mej (Méjusseaume) flux tower site. The site is an ICOS-Ecosystems associated station over intensively managed grazed grassland, part of the INRAE-IEPL dairy experimental farm (180 dairy cows and 170 dairy goats) situated in NW France. The field is grazed by dairy cattle 4 to 6 times yearly, with a livestock density between 20 and 60 LSU/ha during grazing phases. Methane surface fluxes are monitored using the eddy covariance technique, with wind and turbulence measured by a Gill HS50 3-D ultrasonic anemometer and CH4 mixing ratios measured at 10 Hz by a MIRO MGA quantum cascade laser analyser. Half-hourly fluxes were derived using the Eddypro software. This experiment is part of an effort to apply these UAV-based measurement to various types of natural or anthropogenic sources including bogland or agricultural biogas digesters.

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Dates et versions

hal-04906885 , version 1 (22-01-2025)

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  • HAL Id : hal-04906885 , version 1

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Jean-Louis Bonne, Delphine Combaz, Sami Omrane, Nicolas Dumelié, Jérémie Burgalat, et al.. Application of in situ CO2 and CH4 concentrations measurements on-board UAV to monitor surface emissions on a grazed grassland, against ground-based Eddy Covariance. ICOS Science Conference 2024, Sep 2024, Versailles, France. . ⟨hal-04906885⟩
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