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@PHDTHESIS{Zheng:1033787,
      author       = {Zheng, Siyuan},
      title        = {{I}nvestigation of {L}ower {B}oundary {C}onditions of
                      {B}rominated {V}ery {S}hort-lived {S}pecies ({VSLS})},
      school       = {Bergische Universität Wuppertal},
      type         = {Dissertation},
      publisher    = {Bergische Universität Wuppertal},
      reportid     = {FZJ-2024-06628},
      pages        = {168},
      year         = {2024},
      note         = {Dissertation, Bergische Universität Wuppertal, 2024},
      abstract     = {Photochemical reactions with the reactive halogen atoms Cl
                      and Br mostly cause stratospheric ozone depletion. The
                      chlorine- and bromine-containing very short-lived species
                      (VSLS), which have an atmospheric lifetime of less than six
                      months, play an essential role in stratospheric total
                      bromine loading. However, there is considerable uncertainty
                      about the geographical distribution of their sources, and
                      therefore, it is challenging to reproduce the observations.
                      In order to describe the stratospheric or regional abundance
                      of bromine from VSLS, it is of great importance to quantify
                      the lower boundary conditions of these species. In order to
                      increase our understanding of the role of brominated species
                      in the stratosphere, the Chemical Lagrangian Model of the
                      Stratosphere (CLaMS) has been used to investigate the global
                      surface mixing ratio and lower boundary conditions for the
                      simulation in this thesis. The simulation uses a ‘top-down
                      approach, where atmospheric measurements from aircraft are
                      used in combination with models to quantify and refine the
                      lower boundary emissions. The findings of this thesis reveal
                      that the simulation incorporating a monthly global lower
                      boundary, featuring notable seasonal and zonal variations,
                      exhibits enhanced concordance with observations obtained
                      during the SouthTRAC campaign. However, the elevated mixing
                      ratio of CHBr3 and CH2Br2 in the upper atmosphere was not
                      confirmed by climatological upper tropospheric and
                      stratospheric data, presumably due to slow up- ward
                      transport. Moreover, the exceedingly high values detected in
                      specific regions at the estimated lower boundary are likely
                      attributed to the limited available observations from the
                      SouthTRAC campaign. This underscores the necessity for
                      additional observations during spring and summer, as well as
                      observation data from higher latitudes in the Northern
                      Hemisphere, to comprehensively construct the lower boundary
                      distribution of CHBr3 and CH2Br2.},
      cin          = {ICE-4},
      cid          = {I:(DE-Juel1)ICE-4-20101013},
      pnm          = {2112 - Climate Feedbacks (POF4-211)},
      pid          = {G:(DE-HGF)POF4-2112},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.25926/BUW/0-524},
      url          = {https://juser.fz-juelich.de/record/1033787},
}