ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-12-6699-2012 The formaldehyde budget as seen by a global-scale multi-constraint and multi-species inversion system Fortems-Cheiney A. 1 Chevallier F. 1 Pison I. 1 Bousquet P. 1 Saunois M. 1 Szopa S. 1 Cressot C. 1 Kurosu T. P. 2 Chance K. 3 Fried A. 4 Laboratoire des Sciences du Climat et de l'Environnement, CEA-CNRS-UVSQ, UMR8212, Gif-sur-Yvette, France Jet Propulsion Laboratory, California Institute of Technology, USA Atomic and Molecular Physics Division, Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts, USA Earth Observing Laboratory, National Center for Atmospheric Research, Boulder, Colorado, USA 01 08 2012 12 15 6699 6721 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/12/6699/2012/acp-12-6699-2012.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/12/6699/2012/acp-12-6699-2012.pdf

For the first time, carbon monoxide (CO) and formaldehyde (HCHO) satellite retrievals are used together with methane (CH<sub>4</sub>) and methyl choloroform (CH<sub>3</sub>CCl<sub>3</sub> or MCF) surface measurements in an advanced inversion system. The CO and HCHO are respectively from the MOPITT 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<sub>4</sub> 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<sub>4</sub> surface emissions are increased by the inversion, from 1037 to 1394 TgCO and from 489 to 529 TgCH<sub>4</sub> on average for the 2005–2010 period. CH<sub>4</sub> emissions present significant interannual variability and a joint CO-CH<sub>4</sub> fluxes analysis reveals that tropical biomass burning probably played a role in the recent increase of atmospheric methane.

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