Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 8 16 2008 10.5194/acp-8-4891-2008 http://www.atmos-chem-phys.net/8/4891/2008/ http://www.atmos-chem-phys.net/8/4891/2008/acp-8-4891-2008.html http://www.atmos-chem-phys.net/8/4891/2008/acp-8-4891-2008.pdf 4891 4902 2008-08-26 Vertical profile of peroxyacetyl nitrate (PAN) from MIPAS-STR measurements over Brazil in February 2005 and its contribution to tropical UT NO_y partitioning C. Keim G. Y. Liu C. E. Blom H. Fischer T. Gulde M. Höpfner michael.hoepfner@imk.fzk.de C. Piesch F. Ravegnani A. Roiger H. Schlager N. Sitnikov Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe, Germany Institute of Atmospheric Sciences and Climate (ISAC-CNR) , Bologna, Italy Institut für Physik der Atmosphäre, Deutsches Zentrum für Luft- und Raumfahrt, Wessling, Germany Central Aerological Observatory, Dolgoprudny, Moscow region, Russia now at: Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA) CNRS/Univ. Paris 12 et 7, France now at: Department of Earth and Atmospheric Science, City College of New York, USA We report on the retrieval of PAN (CH₃C(O)OONO₂) in the upper tropical troposphere from limb measurements by the remote-sensor MIPAS-STR on board the Russian high altitude research aircraft M55-Geophysica. The measurements were performed close to Araçatuba, Brazil, on 17 February 2005. The retrieval was made in the spectral range 775–820 cm^&minus;1 where PAN exhibits its strongest feature but also more than 10 species interfere. Especially trace gases such as CH₃CCl₃, CFC-113, CFC-11, and CFC-22, emitting also in spectrally broad not-resolved branches, make the processing of PAN prone to errors. Therefore, the selection of appropriate spectral windows, the separate retrieval of several interfering species and the careful handling of the water vapour profile are part of the study presented. <br><br> The retrieved profile of PAN has a maximum of about 0.14 ppbv at 10 km altitude, slightly larger than the lowest reported values (&lt;0.1 ppbv) and much lower than the highest reported in the literature (0.65 ppbv). Besides the NO_y constituents measured by MIPAS-STR (HNO₃, ClONO₂, HO₂NO₂, PAN), the in situ instruments aboard the Geophysica provide simultaneous measurements of NO, NO₂, and the sum NO_y. 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