Publication


T. Jurkat, et al.
Depletion of ozone and reservoir species of chlorine and nitrogen oxide in the lower Antarctic polar vortex measured from aircraft
Geophysical Research Letters, 44(12), 6440-6449, 2017; doi: 10.1002/2017GL073270
middle atmosphere Antarctic polar vortex HCl ClONO2 HNO3 Cly O3 N2O HALO
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Abstract


Novel airborne in situ measurements of inorganic chlorine, nitrogen oxide species, and ozone were performed inside the lower Antarctic polar vortex and at its edge in September 2012. We focus on one flight during the Transport and Composition of the LMS/Earth System Model Validation (TACTS/ESMVal) campaign with the German research aircraft HALO (High-Altitude LOng range research aircraft), reaching latitudes of 65°S and potential temperatures up to 405 K. Using the early winter correlations of reactive trace gases with N2O from the Atmospheric Chemistry Experiment-Fourier Transform Spectrometer (ACE-FTS), we find high depletion of chlorine reservoir gases up to ∼40% (0.8 ppbv) at 12 km to 14 km altitude in the vortex and 0.4 ppbv at the edge in subsided stratospheric air with mean ages up to 4.5 years. We observe denitrification of up to 4 ppbv, while ozone was depleted by 1.2 ppmv at potential temperatures as low as 380 K. The advanced instrumentation aboard HALO enables high-resolution measurements with implications for the oxidation capacity of the lowermost stratosphere.

Reference


@article{GRL:GRL55959,
  author = "T. Jurkat and C. Voigt and S. Kaufmann and J.-U. Grooß and H. Ziereis and A. Dörnbrack and P. Hoor and H. Bozem and A. Engel and H. Bönisch and T. Keber and T. Hüneke and K. Pfeilsticker and A. Zahn and K. A. Walker and C. D. Boone and P. F. Bernath and H. Schlager",
  title = "Depletion of ozone and reservoir species of chlorine and nitrogen oxide in the lower Antarctic polar vortex measured from aircraft",
  year = 2017,
  journal = "Geophysical Research Letters",
  publisher = "AGU Publications",
  volume = 44,
  number = 12,
  pages = "6440-6449",
  month = "Jun",
  keywords = "middle atmosphere, Antarctic polar vortex, HCl, ClONO2, HNO3, Cly, O3, N2O, HALO",
  doi = "10.1002/2017GL073270",
  url = "http://dx.doi.org/10.1002/2017GL073270"
}
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