The formaldehyde budget as seen by a global-scale multi-constraint and multi-species inversion system
Résumé
For the first time, carbon monoxide (CO) and formaldehyde (HCHO) satellite retrievals are used together with methane (CH 4) and methyl choloroform (CH 3 CCl 3 or MCF) surface measurements in an advanced inversion system. The CO and HCHO are respectively from the MO-PITT and OMI instruments. The multi-species and multi-satellite dataset inversion is done for the 2005-2010 period. The robustness of our results is evaluated by comparing our posterior-modeled concentrations with several sets of independent measurements of atmospheric mixing ratios. The inversion leads to significant changes from the prior to the posterior , in terms of magnitude and seasonality of the CO and CH 4 surface fluxes and of the HCHO production by non-methane volatile organic compounds (NMVOC). The latter is significantly decreased, indicating an overestimation of the biogenic NMVOC emissions, such as isoprene, in the GEIA inventory. CO and CH 4 surface emissions are increased by the inversion, from 1037 to 1394 TgCO and from 489 to 529 TgCH 4 on average for the 2005-2010 period. CH 4 emissions present significant interannual variability and a joint CO-CH 4 fluxes analysis reveals that tropical biomass burning probably played a role in the recent increase of atmospheric methane.
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