ACPD Atmospheric Chemistry and Physics Discussions ACPD 1680-7375 Copernicus GmbH Göttingen, Germany 10.5194/acpd-12-6909-2012 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 07 03 2012 12 3 6909 6955 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-discuss.net/12/6909/2012/acpd-12-6909-2012.html The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/12/6909/2012/acpd-12-6909-2012.pdf

For the first time, carbon monoxide (CO) and formaldehyde (HCHO) satellite retrievals have been used together with methane (CH<sub>4</sub>) and methyl choloroform (CH<sub>3</sub>CCl<sub>3</sub> or MCF) surface measurements in a complex inversion system. The CO and HCHO are, respectively from MOPITT and OMI instruments. The multi-species and multi-satellite dataset inversion is done for the 2005–2008 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 results lead 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 3-D HCHO production by non-methane volatile organic compounds (NMVOCs). The latter is significantly decreased, indicating an overestimation of the biogenic NMVOCs emissions, such as isoprene, in the GEIA inventory. CO and CH<sub>4</sub> surface emissions are increased by the inversion, from 1037 to 1409 Tg CO and from 489 to 528 TgCH<sub>4</sub> on average for the 2005–2008 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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