Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 1 2009 10.5194/acpd-9-1051-2009 http://www.atmos-chem-phys-discuss.net/9/1051/2009/ http://www.atmos-chem-phys-discuss.net/9/1051/2009/acpd-9-1051-2009.html http://www.atmos-chem-phys-discuss.net/9/1051/2009/acpd-9-1051-2009.pdf 1051 1095 2009-01-13 Global upper-tropospheric formaldehyde: seasonal cycles observed by the ACE-FTS satellite instrument G. Dufour dufour@lisa.univ-paris12.fr S. Szopa M. P. Barkley C. D. Boone A. Perrin P. I. Palmer P. F. Bernath Laboratoire Inter-universitaire des Systèmes Atmosphériques (LISA), UMR7583, Universités Paris 12 et Paris 7, CNRS, Créteil, France Laboratoire des Sciences du Climat et de l'Environnement (LSCE/IPSL), CNRS-CEA-UVSQ Gif-sur-Yvette, France School of GeoSciences, University of Edinburgh, UK Department of Chemistry, University of Waterloo, Ontario, N2L 3G1, Canada Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK Seasonally-resolved upper tropospheric profiles of formaldehyde (HCHO) observed by the ACE Fourier transform spectrometer (ACE-FTS) on a near-global scale are presented for the time period from March 2004 to November 2006. Large upper tropospheric HCHO mixing ratios (>150 pptv) are observed during the growing season of the terrestrial biosphere in the Northern Hemisphere and during the biomass burning season in the Southern Hemisphere. The total errors estimated for the retrieved mixing ratios range from 30 to 40% in the upper troposphere and increase in the lower stratosphere. The sampled HCHO concentrations are in satisfactory agreement with previous aircraft and satellite observations with a negative bias (<25%) within observation errors. An overview of the seasonal cycle of the upper tropospheric HCHO is given for different latitudes. A maximum is observed during summer, i.e. during the growing season, in the northern mid- and high latitudes. The influence of biomass burning is visible in HCHO upper tropospheric concentrations during the September-to-October period in the southern tropics and subtropics. Comparisons with two state-of-the-art models (GEOS-Chem and LMDz-INCA) show that the models fail to reproduce the seasonal variations observed in the southern tropics and subtropics but they capture well the variations observed in the Northern Hemisphere (correlation >0.9). 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