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@INPROCEEDINGS{Rosanka:902274,
      author       = {Rosanka, Simon and Franco, Bruno and Clarisse, Lieven and
                      Coheur, Pierre-François and Wahner, Andreas and
                      Taraborrelli, Domenico},
      title        = {{O}rganic pollutants from {I}ndonesian peatland fires:
                      regional influences and its impact on lower the
                      stratospheric composition},
      reportid     = {FZJ-2021-04137},
      year         = {2021},
      abstract     = {<p>In 2015, the particularly strong dry season in
                      Indonesia, caused by an exceptional strong El $Ni\&#241;o,$
                      led to severe peatland fires. Due to the high carbon content
                      of peatland, these fires are characterised by high volatile
                      organic compound (VOC) biomass burning emissions. The
                      resulting primary and secondary pollutants are efficiently
                      transported to the upper troposphere/lower stratosphere
                      (UTLS) by the developing Asian monsoon anticyclone (ASMA)
                      and the general upward transport in the intertropical
                      convergence zone (ITCZ). In this study, we assess the
                      importance of these VOC emissions for the composition of the
                      lower troposphere and the UTLS by performing multiple
                      chemistry simulations using the global atmospheric model
                      ECHAM/MESSy (EMAC). In a first step, we find that EMAC
                      properly captures the exceptional strength of the Indonesian
                      fires based on the comparison of modelled columns of the
                      biomass burning marker hydrogen cyanide (HCN) to spaceborne
                      measurements from the Infrared Atmospheric Sounding
                      Interferometer (IASI). In the lower troposphere, the
                      increase in VOC levels is higher in Indonesia compared to
                      other biomass burning regions. This directly impacts the
                      oxidation capacity and leads to a high reduction in hydroxyl
                      radicals (OH) and nitrogen oxides (NO<sub>x</sub>). In
                      general, an increase in ozone (O<sub>3</sub>) is predicted
                      close to the peatland fires. However, particular high
                      concentrations of phenols lead to an O<sub>3</sub> depletion
                      in eastern Indonesia. By employing the detailed in-cloud
                      OVOC oxidation scheme $J\&#252;lich$ 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. The upward transport in the ASMA
                      and the ITCZ leads to elevated VOC concentrations in the
                      UTLS region. This also results in a depletion of lower
                      stratospheric O<sub>3</sub>. We find that this is caused by
                      a high destruction of O<sub>3</sub> by phenoxy radicals and
                      by the increased formation of NO<sub>x</sub> reservoir
                      species, which dampen the chemical production of
                      O<sub>3</sub>.</p>},
      month         = {Apr},
      date          = {2021-04-19},
      organization  = {EGU General Assembly 2021, Online ( ),
                       19 Apr 2021 - 30 Apr 2021},
      subtyp        = {Other},
      cin          = {IEK-8},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {2111 - Air Quality (POF4-211)},
      pid          = {G:(DE-HGF)POF4-2111},
      typ          = {PUB:(DE-HGF)6},
      doi          = {10.5194/egusphere-egu21-10203},
      url          = {https://juser.fz-juelich.de/record/902274},
}