First spaceborne observations of Antarctic stratospheric CIONO2 recovery: Austral spring 2002

M. Höpfner, T. von Clarmann, H. Fischer, N. Glatthor, U. Grabowski, S. Kellman, M. Kiefer, A. Linden, G. Mengistu Tsidu, M. Milz, T. Steck, G. P. Stiller, D. Y. Wang, B. Funke

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We report on the first spaceborne observations of CION02 recovery in the springtime Antarctic polar vortex, performed, by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) from 8 September to 13 October 2002. CIONO2 was retrieved by constrained nonlinear least squares fit from MIPAS measurements with a vertical resolution of 3.3-3.8 km and an estimated accuracy of 6-11% in the lower stratosphere (18-27 km). During the end of September 2002 an unusual major stratospheric warming affected the polar vortex. At the 475 K potential temperature level, CIONO2 showed a pronounced collar structure with high mixing ratios at the vortex edge and values of 0.5-0.6 ppbv in the inner region from 8 to 17 September. During the following 8 days, mean inner vortex CION02 increased by 0.8 ppbv accompanied by a decrease of C1O. Thus from 18 to 25 September the conversion into CIONO2 was a major pathway for chlorine deactivation at 475 K. After 25 September, CIONO2 decreased because of conversion into HCI. The onset of chlorine deactivation at 475 K is consistent with the latest polar stratospheric clouds detected by MIPAS on 18 September. At 625 K, mean inner vortex CIONO2 mixing ratios decreased from 2 to 1.35 ppbv from 8 September to 13 October. This evolution was interrupted by temporary chlorine activation from 12 to 16 September when values of 1.55 ppbv were reached. Comparison with previous measurements and model results of 1992 show similar chlorine partitioning at 475 K before the major warming in 2002. However, there is indication that in 2002 the evolution of chlorine deactivation at 475 K was characterized by a faster and more pronounced increase of CIONO2 compared with 1992.

Original languageEnglish
Pages (from-to)D11308 1-11
JournalJournal of Geophysical Research D: Atmospheres
Issue number11
Publication statusPublished - Jun 16 2004

All Science Journal Classification (ASJC) codes

  • Forestry
  • Aquatic Science
  • Soil Science
  • Water Science and Technology
  • Earth-Surface Processes
  • Geochemistry and Petrology
  • Geophysics
  • Oceanography
  • Palaeontology
  • Ecology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Atmospheric Science


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