ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-5-1423-2005 Ozone loss derived from balloon-borne tracer measurements in the 1999/2000 Arctic winter Robinson A. D. 1 Millard G. A. 1 Danis F. 1 Guirlet M. 1 Harris N. R. P. 1 Lee A. M. 1 McIntyre J. D. 1 Pyle J. A. 1 2 Arvelius J. 3 Dagnesjo S. 3 Kirkwood S. 3 Nilsson H. 3 Toohey D. W. 4 Deshler T. 5 Goutail F. 6 Pommereau J.-P. 6 Elkins J. W. 7 Moore F. 7 Ray E. 7 Schmidt U. 8 Engel A. 8 Müller M. 8 Centre for Atmospheric Science, Department of Chemistry, Cambridge University, Cambridge CB2 1EW, UK NCAS-ACMSU, Department of Chemistry, Cambridge University, Cambridge CB2 1EW, UK Swedish Institute of Space Physics (IRF), Kiruna Division, Box 812, SE-981 28 Kiruna, Sweden Program in Atmospheric and Oceanic Sciences, 311 UCB, University of Colorado, Boulder, CO 80309-0311, USA Department of Atmospheric Science, University of Wyoming, P.O. Box 3038, Laramie, WY 82071, USA Service d’Aeronomie, CNRS, Verrières le Buisson, France Climate Monitoring and Diagnostics Laboratory, NOAA, Boulder, Colorado, USA Univ. of Frankfurt, Institut für Atmosphäre und Umwelt, Georg Voigt Str. 14/Robert Mayer Str. 1, 60325 Frankfurt, Germany 14 06 2005 5 5 1423 1436 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/5/1423/2005/acp-5-1423-2005.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/5/1423/2005/acp-5-1423-2005.pdf

Balloon-borne measurements of CFC11 (from the DIRAC in&nbsp;situ gas chromatograph and the DESCARTES grab sampler), ClO and O<sub>3</sub> were made during the 1999/2000 Arctic winter as part of the SOLVE-THESEO 2000 campaign, based in Kiruna (Sweden). Here we present the CFC11 data from nine flights and compare them first with data from other instruments which flew during the campaign and then with the vertical distributions calculated by the SLIMCAT 3D CTM. We calculate ozone loss inside the Arctic vortex between late January and early March using the relation between CFC11 and O<sub>3</sub> measured on the flights. The peak ozone loss (~1200ppbv) occurs in the 440-470K region in early March in reasonable agreement with other published empirical estimates. There is also a good agreement between ozone losses derived from three balloon tracer data sets used here. The magnitude and vertical distribution of the loss derived from the measurements is in good agreement with the loss calculated from SLIMCAT over Kiruna for the same days.