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@INPROCEEDINGS{George:890289,
      author       = {George, Midhun and Andrés Hernández, Maria Dolores and
                      Liu, Yangzhuoran and Nenakhov, Vladyslav and Philip Burrows,
                      John and Bohn, Birger and Förster, Eric and Zahn, Andreas
                      and Schlager, Hans and Ziereis, Helmut and Schreiner,
                      Benjamin and Pfeilsticker, Klaus},
      title        = {{I}nvestigation of the photochemical activity in different
                      {MPC} outflows during {EM}e{RG}e},
      reportid     = {FZJ-2021-00870},
      year         = {2020},
      abstract     = {<p>Since peroxy radicals are closely involved in a number
                      of tropospheric chemical processes like O<sub>3</sub>
                      budget, hydrocarbon oxidation and acid formation, the
                      accurate measurement of these radicals can provide essential
                      information to improve our understanding of processing and
                      transformation of polluted outflows from megacities and
                      Major Population Centres (MPCs).</p><p>Airborne measurements
                      of the total sum of peroxy radicals, RO<sub>2</sub>*
                      $\&#160;=$ HO<sub>2</sub> + $\&#8721;$ RO<sub>2</sub>, where
                      R is an organic group, were conducted in Europe in summer
                      2017 and in East Asia in spring 2018 within the EMeRGe
                      (Effect of Megacities on the Transport and Transformation of
                      Pollutants on the Regional to Global Scales) project by
                      using the PeRCEAS instrument (Peroxy Radical Chemical
                      Enhancement and Absorption Spectrometer), on board of the
                      HALO research aircraft (www.halo.dlr.de).</p><p>Over the
                      course of both measurement campaigns different MPC outflows
                      were investigated including among others, London, Rome,
                      Manila and Taipei. Polluted air masses of different origin
                      and composition were probed. Overall the peroxy radical
                      mixing ratios were of the same order of magnitude in the air
                      masses probed in Europe and in East Asia. The variations in
                      the photochemical activity were studied by taking into
                      account simultaneous observations of radical precursors and
                      photolysis rates, while applying known oxidation mechanisms.
                      Radical precursors, photolysis rates and aerosol load were
                      generally higher in Asia, which might indicate higher
                      radical loss reactions on the aerosol surface than in
                      Europe. Moreover this study shows a clear deviation in the
                      photostationary state for MPC outflows close to the emission
                      sources. Based on this information, this presentation will
                      focus on the actual understanding of the photochemical
                      processing in the probed air masses.</p>},
      month         = {May},
      date          = {2020-05-04},
      organization  = {EGU 2020, Online (online), 4 May 2020
                       - 8 May 2020},
      subtyp        = {Other},
      cin          = {IEK-8},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {243 - Tropospheric trace substances and their
                      transformation processes (POF3-243)},
      pid          = {G:(DE-HGF)POF3-243},
      typ          = {PUB:(DE-HGF)6},
      doi          = {10.5194/egusphere-egu2020-18635},
      url          = {https://juser.fz-juelich.de/record/890289},
}