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@ARTICLE{Wegner:278675,
      author       = {Wegner, Tobias and Pitts, M. C. and Poole, L. R. and
                      Tritscher, Ines and Grooss, Jens-Uwe and Nakajima, H.},
      title        = {{V}ortex-wide chlorine activation by a mesosclae {PSC}
                      event in the {A}rctic winter of 2009/10},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {15},
      issn         = {1680-7367},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2015-07000},
      pages        = {33731-33754},
      year         = {2015},
      abstract     = {In the Arctic polar vortex of the 2009/10 winter
                      temperatures were low enough to allow widespread formation
                      of Polar Stratospheric Clouds (PSC). These clouds occurred
                      during the initial chlorine activation phase which provided
                      the opportunity to investigate the impact of PSCs on
                      chlorine activation. Satellite observations of gas-phase
                      species and PSCs are used in combination with trajectory
                      modeling to assess this initial activation. The initial
                      activation occurred in association with the formation of
                      PSCs over the east coast of Greenland at the beginning of
                      January 2010. Although this area of PSCs covered only a
                      small portion of the vortex, it was responsible for almost
                      the entire initial activation of chlorine vortex wide.
                      Observations show HCl mixing ratios decreased rapidly in and
                      downstream of this region. Trajectory calculations and
                      simplified heterogeneous chemistry modeling confirmed that
                      the initial chlorine activation continued until ClONO2 was
                      completely depleted and the activated air masses were
                      advected throughout the polar vortex. For the calculation of
                      heterogeneous reaction rates, surface area density is
                      estimated from backscatter observations. Modeled
                      heterogeneous reaction rates along trajectories intersecting
                      with the PSC indicate that the initial phase of chlorine
                      activation occurred in just a few hours. These calculations
                      also indicate that chlorine activation on the binary
                      background aerosol is significantly slower than on the PSCs
                      and the observed chlorine activation can only be explained
                      by an increase in surface area density due to PSCs.
                      Furthermore, there is a strong correlation between the
                      magnitude of the observed HCl depletion and PSC surface
                      area.},
      cin          = {IEK-7},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-7-20101013},
      pnm          = {244 - Composition and dynamics of the upper troposphere and
                      middle atmosphere (POF3-244)},
      pid          = {G:(DE-HGF)POF3-244},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/acpd-15-33731-2015},
      url          = {https://juser.fz-juelich.de/record/278675},
}