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@ARTICLE{Zafar:856778,
      author       = {Zafar, A. Mannan and Müller, Rolf and Grooss, Jens-Uwe and
                      Robrecht, Sabine and Vogel, Bärbel and Lehmann, Ralph},
      title        = {{T}he relevance of reactions of the methyl peroxy radical
                      ({CH} 3 {O} 2 ) and methylhypochlorite ({CH} 3 {OC}l) for
                      {A}ntarctic chlorine activation and ozone loss},
      journal      = {Tellus / B Chemical and physical meteorology Series B},
      volume       = {70},
      number       = {1},
      issn         = {1600-0889},
      address      = {Abingdon},
      publisher    = {Taylor $\&$ Francis},
      reportid     = {FZJ-2018-06122},
      pages        = {1 - 18},
      year         = {2018},
      abstract     = {The maintenance of large concentrations of active chlorine
                      in Antarctic spring allows strong chemical ozone destruction
                      to occur. In the lower stratosphere (approximately
                      16–18 km, 85–55 hPa, 390–430 K) in the core of
                      the polar vortex, high levels of active chlorine are
                      maintained, although rapid gas-phase production of HCl
                      occurs. The maintenance is achieved through HCl null cycles
                      in which the HCl production is balanced by immediate
                      reactivation. The chemistry of the methyl peroxy radical
                      (CH3O2) is essential for these HCl null cycles and thus for
                      Antarctic chlorine and ozone loss chemistry in the lower
                      stratosphere in the core of the polar vortex. The key
                      reaction here is the reaction ; this reaction should not be
                      neglected in simulations of polar ozone loss. Here we
                      investigate the full chemistry of CH3O2 in box-model
                      simulations representative for the conditions in the core of
                      the polar vortex in the lower stratosphere. These
                      simulations include the reaction CH3O2 + Cl, the product
                      methylhypochlorite (CH3OCl) of the reaction CH3O2 + ClO,
                      and the subsequent chemical decomposition of CH3OCl. We find
                      that when the formation of CH3OCl is taken into account, it
                      is important that also the main loss channels for CH3OCl,
                      namely photolysis and reaction with Cl are considered.
                      Provided that this is the case, there is only a moderate
                      impact of the formation of CH3OCl in the reaction
                      CH3O2 + ClO on polar chlorine chemistry in our
                      simulations. Simulated peak mixing ratios of CH3OCl ( ppb)
                      occur at the time of the lowest ozone mixing ratios.
                      Further, our model simulations indicate that the reaction
                      CH3O2 + Cl does not have a strong impact on polar
                      chlorine chemistry. During the period of the lowest ozone
                      concentrations in late September, enhanced values of CH3O2
                      are simulated and, as a consequence, also enhanced values of
                      formaldehyde (about 100 ppt) and methanol (about 5 ppt).},
      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},
      UT           = {WOS:000449362100001},
      doi          = {10.1080/16000889.2018.1507391},
      url          = {https://juser.fz-juelich.de/record/856778},
}