Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 8 2009 10.5194/acp-9-2873-2009 http://www.atmos-chem-phys.net/9/2873/2009/ http://www.atmos-chem-phys.net/9/2873/2009/acp-9-2873-2009.html http://www.atmos-chem-phys.net/9/2873/2009/acp-9-2873-2009.pdf 2873 2890 2009-04-30 Technical Note: Feasibility of CO₂ profile retrieval from limb viewing solar occultation made by the ACE-FTS instrument P. Y. Foucher pierre-yves.foucher@lmd.polytechnique.fr A. Chédin G. Dufour V. Capelle C. D. Boone P. Bernath Laboratoire de Météorologie Dynamique/Institut Pierre Simon Laplace, Ecole Polytechnique, 91128 Palaiseau, France Laboratoire Inter-universitaire des Systèmes Atmosphériques, Faculté des Sciences et Technologies, 61 avenue du Général de Gaulle, 94010 Créteil, France Department of Chemistry, University of Waterloo, Ontario, N2L3G1, Canada Department of Chemistry, University of York, Heslington, York, YO105DD, UK Major limitations of our present knowledge of the global distribution of CO₂ in the atmosphere are the uncertainty in atmospheric transport mixing and the sparseness of in situ concentration measurements. Limb viewing space-borne sounders, observing the atmosphere along tangential optical paths, offer a vertical resolution of a few kilometers for profiles, which is much better than currently flying or planned nadir sounding instruments can achieve. In this paper, we analyse the feasibility of obtaining CO₂ vertical profiles in the 5–25 km altitude range from the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS, launched in August 2003), high spectral resolution solar occultation measurements. Two main difficulties must be overcome: (i) the accurate determination of the instrument pointing parameters (tangent heights) and pressure/temperature profiles independently from an a priori CO₂ profile, and (ii) the potential impact of uncertainties in the temperature knowledge on the retrieved CO₂ profile. The first difficulty has been solved using the \N collision-induced continuum absorption near 4 μm to determine tangent heights, pressure and temperature from the ACE-FTS spectra. The second difficulty has been solved by a careful selection of CO₂ spectral micro-windows. Retrievals using synthetic spectra made under realistic simulation conditions show a vertical resolution close to 2.5 km and accuracy of the order of 2 ppm after averaging over 25 profiles. These results open the way to promising studies of transport mechanisms and carbon fluxes from the ACE-FTS measurements. First CO₂ vertical profiles retrieved from real ACE-FTS occultations shown in this paper confirm the robustness of the method and applicability to real measurements. Anderson, B., Gregory, G., Collins, J. J., Sachse, G., Conway, T., and Whiting, G.: Airborne observations of spatial and temporal variability of tropospheric carbon dioxide, J. Geophys. Res., 101, 1985–1997, 1996. Andrew, A. E., Boering, K. A., Daube, B. C.,Wofsy, S. C., Loewenstein, M., Jost, H., Podolske, J. R.,Webster, C. R., Herman, R. L., Scott, D. C., Flesch, G. J., Moyer, E. J., Elkins, J. W., Dutton, G. S., Hurst, D. F., Moore, F. L., Ray, E. A., Romashkin, P. A., and Strahan, S. 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