École Nationale Supérieure de
Techniques Avancées

Résumé

CO fluxes are measured by the section Air of DTU Environment from a 125 m tower at Risø, 35 km from Copenhagen with a method called Eddy covariance. Flux Footprint models are used to relate the measurement at the tower to its source in the landscape. These are based on models that simulate and parameterize the atmospheric transport from the source to the level of measurement running. To correlate the measurements, an assessment of CO fluxes from technical processes(industry, traffic, households, waste management, agriculture, natural surfaces) based on Intergovernmental Panel on Climate Change approaches, was necessary. These approaches aim at annual assessments, but the target was seasonal and even diurnal estimates as CO fluxes are measured with a 30 min resolution. To compare the measurements with the inventory, the flux footprint model has been implemented with R, a coding language which is very useful when handling data frames. The tower tends to underestimate landscape scale fluxes, resulting in fluxes measured lower than modeled ones. The correlation between both fluxes is probably decreased by the heterogeneity of the landscape which is not taken in account in the flux footprint model. The next step would be to try this comparison with a flux footprint model handling this spatial heterogeneity.