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© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 26 Apr 2019

Research article | 26 Apr 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Chlorine partitioning in the lowermost Arctic vortex during the cold winter 2015/2016

Andreas Marsing1,2, Tina Jurkat-Witschas1, Jens-Uwe Grooß3, Stefan Kaufmann1, Romy Heller1, Andreas Engel4, Peter Hoor2, Jens Krause2,a, and Christiane Voigt1,2 Andreas Marsing et al.
  • 1Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany
  • 2Johannes-Gutenberg-Universität Mainz, Institut für Physik der Atmosphäre, Mainz, Germany
  • 3Forschungszentrum Jülich, Institut für Energie- und Klimaforschung – Stratosphäre (IEK-7), Jülich, Germany
  • 4Goethe Universität Frankfurt, Institut für Atmosphäre und Umwelt, Frankfurt, Germany
  • anow at: Excelitas Technologies GmbH & Co. KG, Wiesbaden, Germany

Abstract. Activated chlorine compounds in the polar winter stratosphere drive catalytic cycles that process ozone and methane, whose abundances are highly relevant to the evolution of global climate. The present work introduces a novel dataset of in situ measurements of relevant chlorine species in the Arctic lowermost stratosphere from the aircraft mission POLSTRACC/GWLCYCLE/SALSA during winter 2015/2016. The major stages of chemical evolution of the lower polar vortex are presented in a consistent series of high resolution mass spectrometric observations of HCl and ClONO2. Simultaneous measurements of CFC-12 are used to derive total inorganic chlorine (Cly) and active chlorine (ClOx). The new data highlight an altitude dependent shift in the pathway of chlorine deactivation through the recovery of the reservoir species from ClONO2 to HCl in the lowermost vortex below the 380 K isentropic surface. Further, we show that the Chemical Lagrangian Model of the Stratosphere (CLaMS) is generally able to reproduce the chemical evolution of the lower polar vortex chlorine budget, except from a bias in HCl concentrations. The model is used to relate local measurements to the vortex-wide evolution. The results are aimed at fostering our understanding of the climate impact of chlorine chemistry, providing new observational data to complement satellite data and assess model performance in the climate sensitive upper troposphere and lower stratosphere region.

Andreas Marsing et al.
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Andreas Marsing et al.
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Short summary
We study the partitioning of inorganic chlorine into active (ozone depleting) and reservoir species in the lowermost stratosphere of the Arctic polar vortex, using novel in situ aircraft measurements in winter 2015/2016. We observe a change in recovery pathways of the reservoirs HCl and ClONO2 with increasing potential temperature. A comparison with the CLaMS model relates the observations to the vortex-wide evolution and confirms unresolved discrepancies in the mid-winter HCl distribution.
We study the partitioning of inorganic chlorine into active (ozone depleting) and reservoir...