Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 6 2008 10.5194/acpd-8-20607-2008 http://www.atmos-chem-phys-discuss.net/8/20607/2008/ http://www.atmos-chem-phys-discuss.net/8/20607/2008/acpd-8-20607-2008.html http://www.atmos-chem-phys-discuss.net/8/20607/2008/acpd-8-20607-2008.pdf 20607 20659 2008-12-10 Carbon monoxide distributions from the upper troposphere to the mesosphere inferred from 4.7 μm non-local thermal equilibrium emissions measured by MIPAS on Envisat B. Funke bernd@iaa.es M. López-Puertas M. García-Comas G. P. Stiller T. von Clarmann M. Höpfner N. Glatthor U. Grabowski S. Kellmann A. Linden Instituto de Astrofísica de Andalucía, CSIC, Granada, Spain Forschungszentrum and University of Karlsruhe, Institut für Meteorologie und Klimaforschung (IMK), Karlsruhe, Germany We present global distributions of carbon monoxide (CO) from the upper troposphere to the mesosphere observed by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on Envisat. Vertically resolved volume mixing ratio profiles have been retrieved from 4.7 μm limb emission spectra under consideration of non-local thermodynamic equilibrium. The precision of individual CO profiles is typically 5–30 ppbv (15–40%). Estimated systematic errors are in the order of 8–15%. Below 60 km, the vertical resolution is 4–7 km. The data set which covers 54 days from September 2003 to March 2004 has been derived with an improved retrieval version including (i) the retrieval of log(vmr), (ii) the consideration of illumination-dependent vibrational population gradients along the instrument's line of sight, and (iii) joint-fitted vmr horizontal gradients in latitudinal and longitudinal directions. A detailed analysis of spatially resolved CO distributions during the 2003/2004 Northern Hemisphere major warming event demonstrate the potential of MIPAS CO observations to obtain new information on transport processes during dynamical active episodes, particularly on those acting in the vertical. From the temporal evolution of zonally averaged CO abundances, we derived extraordinary polar winter descent velocities of 1200 m per day inside the recovered polar vortex in January 2004. Middle stratospheric CO abundances show a well established correlation with the chemical source CH₄, particularly in the tropics. 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