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Estimation des flux de gaz à effet de serre à l'échelle régionale à partir de mesures atmosphériques

Abstract : I build up a new system to measure continuously CO2 (or CO), CH4, N2O and SF6 mixing ratios. It is based on a commercial gas chromatograph (Agilent 6890N) which have been modified to reach better precisions. Reproducibility computed with a target gas on a 24 hours time step gives: 0.06 ppm for CO2, 1.4 ppb for CO, 0.7 ppb for CH4, 0.2 ppb for N2O and 0.05 ppt for SF6. The instrument's run is fully automated, an air sample analysis takes about 5 minutes. In July 2006, I install instrumentation on a telecommunication tall tower (200m) situated near Orleans forest in Trainou, to monitor continuously greenhouse gases (CO2, CH4, N2O, SF6), atmospheric tracers (CO, Radon-222) and meteorological parameters. Intake lines were installed at 3 levels (50, 100 and 180 m) and allow us to sample air masses along the vertical. Continuous measurement started in January 2007. I used Mace Head (Ireland) and Gif-sur-Yvette continuous measurements to estimate major greenhouse gases emission fluxes at regional scale. To make the link between atmospheric measurements and surface fluxes, we need to quantify dilution due to atmospheric transport. I used Radon-222 as tracer (radon tracer method) and planetary boundary layer heights estimates from ECMWF model (boundary layer budget method) to parameterise atmospheric transport. In both cases I compared results to available emission inventories.
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https://tel.archives-ouvertes.fr/tel-00164720
Contributor : Cyril Messager <>
Submitted on : Thursday, October 25, 2007 - 12:04:22 PM
Last modification on : Thursday, August 6, 2020 - 4:31:49 PM
Long-term archiving on: : Thursday, September 23, 2010 - 3:56:28 PM

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  • HAL Id : tel-00164720, version 3

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Cyril Messager. Estimation des flux de gaz à effet de serre à l'échelle régionale à partir de mesures atmosphériques. Océan, Atmosphère. Université Paris-Diderot - Paris VII, 2007. Français. ⟨tel-00164720v3⟩

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