Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 2 2009 10.5194/acpd-9-7505-2009 http://www.atmos-chem-phys-discuss.net/9/7505/2009/ http://www.atmos-chem-phys-discuss.net/9/7505/2009/acpd-9-7505-2009.html http://www.atmos-chem-phys-discuss.net/9/7505/2009/acpd-9-7505-2009.pdf 7505 7529 2009-03-20 On the capability of IASI measurements to inform about CO surface emissions A. Fortems-Cheiney F. Chevallier frederic.chevallier@lsce.ipsl.fr I. Pison P. Bousquet C. Carouge C. Clerbaux P.-F. Coheur M. George D. Hurtmans S. Szopa Laboratoire des Sciences du Climat et de l'Environnement, CEA-CNRS-UVSQ, Gif-sur-Yvette, France UPMC Univ Paris 06, CNRS UMR8190, LATMOS/IPSL, Paris, France Spectroscopie de l'atmosphère, Chimie Quantique et Photophysique, Université Libre de Bruxelles, Brussels, Belgium now at: Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA Between July and November 2008, simultaneous observations were conducted by several orbiting instruments that monitor carbon monoxide in the atmosphere, among them the Infrared Atmospheric Sounding Instrument (IASI) and Measurements Of Pollution In The Troposphere (MOPITT). In this paper, the concentration retrievals at about 700 hPa from these two instruments are successively used in a variational Bayesian system to infer the global distribution of CO emissions. 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