ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-9-1735-2009 Stratospheric BrONO<sub>2</sub> observed by MIPAS Höpfner M. 1 Orphal J. 2 von Clarmann T. 1 Stiller G. 1 Fischer H. 1 Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe, Germany Laboratoire Interuniversitaire des Systèmes Atmosphériques, CNRS UMR 7583, Université de Paris-Est, Créteil, France 06 03 2009 9 5 1735 1746 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/9/1735/2009/acp-9-1735-2009.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/9/1735/2009/acp-9-1735-2009.pdf

The first measurements of stratospheric bromine nitrate (BrONO<sub>2</sub>) are reported. Bromine nitrate has been clearly identified in atmospheric infrared emission spectra recorded with the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) aboard the European Envisat satellite, and stratospheric concentration profiles have been determined for different conditions (day and night, different latitudes). The BrONO<sub>2</sub> concentrations show strong day/night variations, with much lower concentrations during the day. Maximum volume mixing ratios observed during night are 20 to 25 pptv. The observed concentration profiles are in agreement with estimations from photochemical models and show that the current understanding of stratospheric bromine chemistry is generally correct.

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