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@ARTICLE{Taraborrelli:891567,
      author       = {Taraborrelli, Domenico and Cabrera-Perez, David and Bacer,
                      Sara and Gromov, Sergey and Lelieveld, Jos and Sander, Rolf
                      and Pozzer, Andrea},
      title        = {{I}nfluence of aromatics on tropospheric gas-phase
                      composition},
      journal      = {Atmospheric chemistry and physics},
      volume       = {21},
      number       = {4},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2021-01592},
      pages        = {2615 - 2636},
      year         = {2021},
      abstract     = {Aromatics contribute a significant fraction to organic
                      compounds in the troposphere and are mainly emitted by
                      anthropogenic activities and biomass burning. Their
                      oxidation in lab experiments is known to lead to the
                      formation of ozone and aerosol precursors. However, their
                      overall impact on tropospheric composition is uncertain as
                      it depends on transport, multiphase chemistry, and removal
                      processes of the oxidation intermediates. Representation of
                      aromatics in global atmospheric models has been either
                      neglected or highly simplified. Here, we present an
                      assessment of their impact on gas-phase chemistry, using the
                      general circulation model EMAC (ECHAM5/MESSy Atmospheric
                      Chemistry). We employ a comprehensive kinetic model to
                      represent the oxidation of the following monocyclic
                      aromatics: benzene, toluene, xylenes, phenol, styrene,
                      ethylbenzene, trimethylbenzenes, benzaldehyde, and lumped
                      higher aromatics that contain more than nine C
                      atoms.Significant regional changes are identified for
                      several species. For instance, glyoxal increases by
                      $130 \%$ in Europe and $260 \%$ in East Asia,
                      respectively. Large increases in HCHO are also predicted in
                      these regions. In general, the influence of aromatics is
                      particularly evident in areas with high concentrations of
                      NOx, with increases up to $12 \%$ in O3 and $17 \%$ in
                      OH.On a global scale, the estimated net changes of trace gas
                      levels are minor when aromatic compounds are included in our
                      model. For instance, the tropospheric burden of CO increases
                      by about $6 \%,$ while the burdens of OH, O3, and NOx
                      (NO+NO2) decrease between $3 \%$ and $9 \%.$ The global
                      mean changes are small, partially because of compensating
                      effects between high- and low-NOx regions. The largest
                      change is predicted for the important aerosol precursor
                      glyoxal, which increases globally by $36 \%.$ In contrast
                      to other studies, the net change in tropospheric ozone is
                      predicted to be negative, $−3 \%$ globally. This change
                      is larger in the Northern Hemisphere where global models
                      usually show positive biases. We find that the reaction with
                      phenoxy radicals is a significant loss for ozone, on the
                      order of 200–300 Tg yr−1, which is similar to the
                      estimated ozone loss due to bromine chemistry.Although the
                      net global impact of aromatics is limited, our results
                      indicate that aromatics can strongly influence tropospheric
                      chemistry on a regional scale, most significantly in East
                      Asia. An analysis of the main model uncertainties related to
                      oxidation and emissions suggests that the impact of
                      aromatics may even be significantly larger.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {211 - Die Atmosphäre im globalen Wandel (POF4-211)},
      pid          = {G:(DE-HGF)POF4-211},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000622972500001},
      doi          = {10.5194/acp-21-2615-2021},
      url          = {https://juser.fz-juelich.de/record/891567},
}