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@ARTICLE{Rosanka:902279,
      author       = {Rosanka, Simon and Franco, Bruno and Clarisse, Lieven and
                      Coheur, Pierre-François and Wahner, Andreas and
                      Taraborrelli, Domenico},
      title        = {{O}rganic pollutants from tropical peatland fires: regional
                      influences and its impact on lower stratospheric ozone},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {},
      issn         = {1680-7367},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2021-04142},
      pages        = {},
      year         = {2020},
      abstract     = {Abstract. The particularly strong dry season in Indonesia
                      in 2015, caused by an exceptional strong El Niño, led to
                      severe peatland fires resulting in high volatile organic
                      compound (VOC) biomass burning emissions. At the same time,
                      the developing Asian monsoon anticyclone (ASMA) and the
                      general upward transport in the intertropical convergence
                      zone (ITCZ) efficiently transported the resulting primary
                      and secondary pollutants to the upper troposphere/lower
                      stratosphere (UTLS). In this study, we assess the importance
                      of these VOC emissions for the composition of the lower
                      troposphere and the UTLS, and we investigate the effect of
                      in-cloud oxygenated VOC (OVOC) oxidation during such a
                      strong pollution event. This is achieved by performing
                      multiple chemistry simulations using the global atmospheric
                      model ECHAM/MESSy (EMAC). By comparing modelled columns of
                      the biomass burning marker hydrogen cyanide (HCN) to
                      spaceborne measurements from the Infrared Atmospheric
                      Sounding Interferometer (IASI), we find that EMAC properly
                      captures the exceptional strength of the Indonesian fires.
                      In the lower troposphere, the increase in VOC levels is
                      higher in Indonesia compared to other biomass burning
                      regions. This has a direct impact on the oxidation capacity,
                      resulting in the largest regional reduction in hydroxyl
                      radicals (OH) and nitrogen oxides (NOx). Even though an
                      increase in ozone (O3) is predicted close to the peatland
                      fires, particular high concentrations of phenols lead to an
                      O3 depletion in eastern Indonesia. By employing the detailed
                      in-cloud OVOC oxidation scheme Jülich Aqueous-phase
                      Mechanism of Organic Chemistry (JAMOC), we find that the
                      predicted changes are dampened and that by ignoring these
                      processes, global models tend to overestimate the impact of
                      such extreme pollution events. In the ASMA and the ITCZ, the
                      upward transport leads to elevated VOC concentrations in the
                      UTLS region, which results in a depletion of lower
                      stratospheric O3. We find that this is caused by a high
                      destruction of O3 by phenoxy radicals and by the increased
                      formation of NOx reservoir species, which dampen the
                      chemical production of O3. The Indonesian peatland fires
                      regularly occur during El Niño years and contribute to the
                      depletion of O3. In the time period from 2001 to 2016, we
                      find that the lower stratospheric O3 is reduced by about
                      0.38 DU and contributes to about 25 $\%$ to the lower
                      stratospheric O3 reduction observed by remote sensing. By
                      not considering these processes, global models might not be
                      able to reproduce this variability in lower stratospheric
                      O3.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {2111 - Air Quality (POF4-211)},
      pid          = {G:(DE-HGF)POF4-2111},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/acp-2020-1130},
      url          = {https://juser.fz-juelich.de/record/902279},
}