ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-5-1409-2005 Balloon-borne limb profiling of UV/vis skylight radiances, O<sub>3</sub>, NO<sub>2</sub>, and BrO: technical set-up and validation of the method Weidner F. 1 Bösch H. 1 4 Bovensmann H. 3 Burrows J. P. 3 Butz A. 1 2 Camy-Peyret C. 2 Dorf M. 1 Gerilowski K. 3 Gurlit W. 3 Platt U. 1 von Friedeburg C. 1 Wagner T. 1 Pfeilsticker K. 1 Institut für Umweltphysik, University of Heidelberg, Heidelberg, Germany Laboratoire de Physique Moléculaire et Applications (LPMA), Université Pierre et Marie Curie, Paris, France Institut für Umweltphysik und Fernerkundung, University of Bremen, Bremen, Germany now at: Jet Propulsion Laboratory (JPL), Pasadena, USA 14 06 2005 5 5 1409 1422 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/5/1409/2005/acp-5-1409-2005.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/5/1409/2005/acp-5-1409-2005.pdf

A novel light-weight, elevation scanning and absolutely calibrated UV/vis spectrometer and its application to balloon-borne limb radiance and trace gas profile measurements is described. Its performance and the novel method of balloon-borne UV/vis limb trace gas measurements has been tested against simultaneous observations of the same atmospheric parameters available from either (a) in-situ instrumentation (cf., by an electrochemical cell (ECC) ozone sonde also deployed aboard the gondola) or (b) trace gas profiles inferred from UV/vis/near IR solar occultation measurements performed on the same payload. The novel technique is also cross validated with radiative transfer modeling. Reasonable agreement is found (a) between measured and simulated limb radiances and (b) inferred limb O<sub>3</sub>, NO<sub>2</sub>, and BrO and correlative profile measurements when properly accounting for all relevant atmospheric parameters (temperature, pressure, aerosol extinction, and major absorbers).