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@ARTICLE{Li:858787,
      author       = {Li, Dan and Vogel, Bärbel and Müller, Rolf and Bian,
                      Jianchun and Günther, Gebhard and Li, Qian and Zhang,
                      Jinqiang and Bai, Zhixuan and Vömel, Holger and Riese,
                      Martin},
      title        = {{H}igh tropospheric ozone in {L}hasa within the {A}sian
                      summer monsoon anticyclone in 2013: influence of convective
                      transport and stratospheric intrusions},
      journal      = {Atmospheric chemistry and physics},
      volume       = {18},
      number       = {24},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2018-07627},
      pages        = {17979 - 17994},
      year         = {2018},
      abstract     = {Balloon-borne measurements of ozone in Lhasa (29.66∘ N,
                      91.14∘ E; 3650 m above sea level) in August 2013 are
                      investigated using backward trajectory calculations
                      performed with the Chemical Lagrangian Model of the
                      Stratosphere (CLaMS). Measurements show three time periods
                      characterized by high ozone mixing ratios (OMRs) in the
                      troposphere on 8, 11, and 18–20 August 2013 during the
                      Asian summer monsoon (ASM) season. Here, we verified two
                      different sources for the enhanced ozone values in the
                      troposphere. First, transport of polluted air from the
                      boundary layer, and second downward transport from the
                      stratosphere by stratospheric intrusions. Air pollution from
                      South Asia through convective and long-range transport plays
                      a key role in enhancing middle tropospheric OMRs up to
                      $90 \%$ on 8 August and up to $125 \%$ on 11 August 2013
                      compared to monthly mean ozone of August 2013. Stratospheric
                      air intruded from the northern high-latitudes to the
                      southeastern flank of the ASM anticyclone to the troposphere
                      and is identified as the source of enhanced ozone according
                      to backward trajectory calculation and satellite
                      measurements by the Ozone Monitoring Instrument (OMI) and
                      the Atmospheric Infrared Sounder (AIRS). Air parcels with
                      high ozone moved from the high-latitude lower stratosphere
                      to the middle and upper troposphere. These air parcels are
                      then transported to Lhasa over long distances and enhanced
                      upper and middle tropospheric ozone over Lhasa during
                      18–20 August 2013. Our findings demonstrate that the
                      strong variability of ozone within the ASM anticyclone in
                      the free troposphere is caused by transport from very
                      different regions of the atmosphere.},
      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:000453578900005},
      doi          = {10.5194/acp-18-17979-2018},
      url          = {https://juser.fz-juelich.de/record/858787},
}