Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 2 2009 10.5194/acpd-9-8035-2009 http://www.atmos-chem-phys-discuss.net/9/8035/2009/ http://www.atmos-chem-phys-discuss.net/9/8035/2009/acpd-9-8035-2009.html http://www.atmos-chem-phys-discuss.net/9/8035/2009/acpd-9-8035-2009.pdf 8035 8069 2009-03-25 Global distributions of nitric acid from IASI/MetOP measurements C. Wespes cwespes@ulb.ac.be D. Hurtmans C. Clerbaux M. L. Santee R. V. Martin P. F. Coheur Spectroscopie de l'Atmosphère, Chimie Quantique et Photophysique, Université Libre de Bruxelles (U.L.B.), Brussels, Belgium UPMC Univ. Paris 06, CNRS UMR8190, LATMOS/IPSL, Paris, France Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA Department of Physics and Atmospheric Science, Dalhousie University Halifax, Canada Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts, USA This paper presents the first global distributions of HNO₃ acquired by the Infrared Atmospheric Sounding Interferometer (IASI) instrument, launched onboard the MetOp platform in October 2006. IASI is an infrared nadir-looking Fourier transform spectrometer providing atmospheric radiance spectra at 0.5 cm^−1 spectral resolution, from which temperature and infrared absorbing gas concentration profiles are retrieved with global Earth coverage twice a day. A first analysis of the IASI measurements in terms of information content demonstrates the possibility of retrieving a total column for HNO₃ at all latitudes with a maximal sensitivity in the middle stratosphere. The retrievals are performed from IASI spectra in the atmospheric window using a fast radiative transfer model and inversion software relying on the Optimal Estimation Method. The operational processing of HNO₃ is achieved since March 2008. The global distributions of the retrieved total columns for 10 months (from March to December 2008) are presented and discussed with emphasis given to seasonal and interhemispheric variations. Local trends at 6 specific locations are also described and discussed in comparison with MLS volume mixing ratios at 46.5 hPa. The seasonal cycle observed in Polar regions is highlighted, with maxima observed in fall and minima during spring-summer. 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