Bridging the gap between atmospheric concentrations and local ecosystem measurements
Lauvaux, T. ; Gioli, B. ; Sarrat, C. ; Rayner, P. J. ; Ciais, P. ; Chevallier, F. ; Noilhan, J. ; Miglietta, F. ; Brunet, Y. ; Ceschia, E. ; Dolman, H. ; Elbers, J. A. ; Gerbig, C. ; Hutjes, R. ; Jarosz, N. ; Legain, D. ; Uliasz, M.
This paper demonstrates that atmospheric inversions of CO2 are a reliable tool for estimating regional fluxes. We compare results of an inversion over 18 days and a 300 x 300 km² domain in southwest France against independent measurements of fluxes from aircraft and towers. The inversion used concentration measurements from 2 towers while the independent data included 27 aircraft transects and 5 flux towers. The inversion reduces the mismatch between prior and independent fluxes, improving both spatial and temporal structures. The present mesoscale atmospheric inversion improves by 30% the CO2 fluxes over distances of few hundreds of km around the atmospheric measurement locations.
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