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@ARTICLE{vonHobe:17083,
      author       = {von Hobe, M. and Grooß, J.-U. and Günther, G. and
                      Konopka, P. and Gensch, I. and Krämer, M. and Spelten, N.
                      and Afchine, A. and Schiller, C. and Ulanovsky, A. and
                      Sitnikov, N. and Shur, G. and Yushkov, V. and Ravegnani, F.
                      and Cairo, F. and Roiger, A. and Voigt, C. and Schlager, H.
                      and Weigel, R. and Frey, W. and Borrmann, S. and Müller, R.
                      and Stroh, F.},
      title        = {{E}vidence for heterogeneous chlorine activation in the
                      tropical {UTLS}},
      journal      = {Atmospheric chemistry and physics},
      volume       = {11},
      issn         = {1680-7316},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {PreJuSER-17083},
      pages        = {241 - 256},
      year         = {2011},
      abstract     = {Airborne in-situ observations of ClO in the tropics were
                      made during the TROCCINOX (Aracatuba, Brazil, February 2005)
                      and SCOUT-O-3 (Darwin, Australia, November/December 2005)
                      field campaigns. While during most flights significant
                      amounts of ClO (approximate to 10-20 parts per trillion,
                      ppt) were present only in aged stratospheric air, instances
                      of enhanced ClO mixing ratios of up to 40 ppt -
                      significantly exceeding those expected from gas phase
                      chemistry - were observed in air masses of a more
                      tropospheric character. Most of these observations are
                      associated with low temperatures or with the presence of
                      cirrus clouds (often both), suggesting that cirrus ice
                      particles and/or liquid aerosol at low temperatures may
                      promote significant heterogeneous chlorine activation in the
                      tropical upper troposphere lower stratosphere (UTLS). In two
                      case studies, particularly high levels of ClO observed were
                      reproduced by chemistry simulations only under the
                      assumption that significant denoxification had occurred in
                      the observed air. However, to reproduce the ClO observations
                      in these simulations, O-3 mixing ratios higher than observed
                      had to be assumed, and at least for one of these flights, a
                      significant denoxification is in contrast to the observed NO
                      levels, suggesting that the coupling of chlorine and
                      nitrogen compounds in the tropical UTLS may not be
                      completely understood.},
      keywords     = {J (WoSType)},
      cin          = {IEK-8 / IEK-7},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013 / I:(DE-Juel1)IEK-7-20101013},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK491},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000286180200018},
      doi          = {10.5194/acp-11-241-2011},
      url          = {https://juser.fz-juelich.de/record/17083},
}