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@INPROCEEDINGS{Rosanka:902273,
      author       = {Rosanka, Simon},
      title        = {{I}nfluence of in-cloud oxidation of organic compounds on
                      tropospheric ozone},
      reportid     = {FZJ-2021-04136},
      year         = {2021},
      abstract     = {<p>Large parts of the troposphere are affected by clouds,
                      whose aqueous-phase chemistry differs significantly from
                      gas-phase chemistry. Box-model studies have demonstrated
                      that clouds influence the tropospheric oxidation capacity.
                      However, most global atmospheric models do not represent
                      this chemistry reasonably well and are largely limited to
                      sulfur oxidation. Therefore, we have developed the
                      $J\&#252;lich$ Aqueous-phase Mechanism of Organic Chemistry
                      (JAMOC), making a detailed in-cloud oxidation model of
                      oxygenated volatile organic compounds (OVOCs) readily
                      available for box as well as for regional and global
                      simulations that are affordable with modern supercomputers.
                      JAMOC includes the phase transfer of species containing up
                      to ten carbon atoms, and the aqueous-phase reactions of a
                      selection of species containing up to four carbon atoms,
                      e.g., ethanol, acetaldehyde, glyoxal. The impact of in-cloud
                      chemistry on tropospheric composition is assessed on a
                      regional and global scale by performing a combination of
                      box-model studies using the Chemistry As A Boxmodel
                      Application (CAABA) and the global atmospheric model
                      ECHAM/MESSy (EMAC). These models are capable to represent
                      the described processes explicitly and integrate the
                      corresponding ODE system with a Rosenbrock
                      $solver.\&#160;</p><p>Overall,$ the explicit in-cloud
                      oxidation leads to a reduction of predicted OVOCs levels. By
                      comparing EMAC's prediction of methanol abundance to
                      spaceborne retrievals from the Infrared Atmospheric Sounding
                      Interferometer (IASI), a reduction in EMAC's overestimation
                      is observed in the tropics. Further, the in-cloud OVOC
                      oxidation shifts the hydroperoxyl radicals (HO<sub>2</sub>)
                      production from the gas- to the aqueous-phase. As a result,
                      the in-cloud destruction (scavenging) of ozone
                      (O<sub>3</sub>) by the superoxide anion
                      (O<sub>2</sub><sup>-</sup>) is enhanced and accompanied by a
                      reduction in both sources and sinks of tropospheric
                      O<sub>3</sub> in the gas phase. By considering only the
                      in-cloud sulfur oxidation by O<sub>3</sub>, about 13 Tg
                      a<sup>-1</sup> of O<sub>3</sub> are scavenged, which
                      increases to 336 Tg a<sup>-1</sup> when JAMOC is used. With
                      the full oxidation scheme, the highest O<sub>3</sub>
                      reduction of 12 $\%$ is predicted in the upper
                      troposphere/lower stratosphere (UTLS). Based on the IASI
                      O<sub>3</sub> retrievals, it is demonstrated that these
                      changes in the free troposphere significantly reduce the
                      modelled tropospheric O<sub>3</sub> columns, which are known
                      to be generally overestimated by global atmospheric models.
                      Finally, the relevance of aqueous-phase oxidation of
                      organics for ozone in hazy polluted regions will be
                      presented. $\&#160;</p>$},
      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-egu21-10276},
      url          = {https://juser.fz-juelich.de/record/902273},
}