% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Zhang:889164,
      author       = {Zhang, Yuli and Tao, Mengchu and Zhang, Jinqiang and Liu,
                      Yi and Chen, Hongbin and Cai, Zhaonan and Konopka, Paul},
      title        = {{L}ong-term variations in ozone levels in the troposphere
                      and lower stratosphere over {B}eijing: observations and
                      model simulations},
      journal      = {Atmospheric chemistry and physics},
      volume       = {20},
      number       = {21},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2021-00087},
      pages        = {13343 - 13354},
      year         = {2020},
      abstract     = {Tropospheric ozone is both a major pollutant and a
                      short-lived greenhouse gas and has therefore caused much
                      concern in recent years. The ozone profile in the
                      troposphere and lower stratosphere over Beijing has been
                      observed since 2002 by ozonesondes developed by the
                      Institute of Atmospheric Physics. Increasing concentrations
                      of tropospheric ozone from 2002 to 2010 measured by these
                      balloon-based observations have been reported previously. As
                      more observations are now available, we used these data to
                      analyse the long-term variability of ozone over Beijing
                      during the whole period from 2002 to 2018. The ozonesondes
                      measured increasing concentrations of ozone from 2002 to
                      2012 in both the troposphere and lower stratosphere. There
                      was a sudden decrease in observed ozone between 2011 and
                      2012. After this decrease, the increasing trend in ozone
                      concentrations slowed down, especially in the
                      mid-troposphere, where the positive trend became neutral. We
                      used the Chemical Lagrangian Model of the Stratosphere
                      (CLaMS) to determine the influence of the transport of ozone
                      from the stratosphere to the troposphere on the observed
                      ozone profiles. CLaMS showed a weak increase in the
                      contribution of stratospheric ozone before the decrease in
                      2011–2012 and a much more pronounced decrease after this
                      time. Because there is no tropospheric chemistry in CLaMS,
                      the sudden decrease simulated by CLaMS indicates that a
                      smaller downward transport of ozone from the stratosphere
                      after 2012 may explain a significant part of the observed
                      decrease in ozone in the mid-troposphere and lower
                      stratosphere. However, the influence of stratospheric ozone
                      in the lower troposphere is negligible in CLaMS, and the
                      hiatus in the positive trend after 2012 can be attributed to
                      a reduction in ozone precursors as a result of stronger
                      pollution control measures in Beijing.},
      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:000588284300002},
      doi          = {10.5194/acp-20-13343-2020},
      url          = {https://juser.fz-juelich.de/record/889164},
}