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@ARTICLE{Rosanka:894238,
      author       = {Rosanka, Simon and Franco, Bruno and Clarisse, Lieven and
                      Coheur, Pierre-François and Pozzer, Andrea and Wahner,
                      Andreas and Taraborrelli, Domenico},
      title        = {{T}he impact of organic pollutants from {I}ndonesian
                      peatland fires on the tropospheric and lower stratospheric
                      composition},
      journal      = {Atmospheric chemistry and physics},
      volume       = {21},
      number       = {14},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2021-03118},
      pages        = {11257 - 11288},
      year         = {2021},
      abstract     = {The particularly strong dry season in Indonesia in 2015,
                      caused by an exceptionally 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 and 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 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) and carbon
                      monoxide (CO) 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 the
                      hydroxyl radical (OH) and nitrogen oxides (NOx). While an
                      increase in ozone (O3) is predicted close to the peatland
                      fires, simulated O3 decreases in eastern Indonesia due to
                      particularly high phenol concentrations. In the ASMA and the
                      ITCZ, the upward transport leads to elevated VOC
                      concentrations in the lower stratosphere, which results in
                      the reduction of OH and NOx and the increase in the
                      hydroperoxyl radical (HO2). In addition, the degradation of
                      VOC emissions from the Indonesian fires becomes a major
                      source of lower stratospheric nitrate radicals (NO3), which
                      increase by up to $20 \%.$ Enhanced phenol levels in the
                      upper troposphere result in a $20 \%$ increase in the
                      contribution of phenoxy radicals to the chemical destruction
                      of O3, which is predicted to be as large as $40 \%$ of the
                      total chemical O3 loss in the UTLS. In the months following
                      the fires, this loss propagates into the lower stratosphere
                      and potentially contributes to the variability of lower
                      stratospheric O3 observed by satellite retrievals. The
                      Indonesian peatland fires regularly occur during El Niño
                      years, and the largest perturbations of radical
                      concentrations in the lower stratosphere are predicted for
                      particularly strong El Niño years. By activating the
                      detailed in-cloud OVOC oxidation scheme Jülich
                      Aqueous-phase Mechanism of Organic Chemistry (JAMOC), we
                      find that the predicted changes are dampened. Global models
                      that neglect in-cloud OVOC oxidation tend to overestimate
                      the impact of such extreme pollution events on the
                      atmospheric composition.},
      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},
      UT           = {WOS:000678602500003},
      doi          = {10.5194/acp-21-11257-2021},
      url          = {https://juser.fz-juelich.de/record/894238},
}