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@INPROCEEDINGS{Schreiner:890290,
      author       = {Schreiner, Benjamin and Pfeilsticker, Klaus and Kluge,
                      Flora and Rotermund, Meike and Zahn, Andreas and Ziereis,
                      Helmut and Bohn, Birger and Schneider, Johannes and Kaiser,
                      Katharina and Pozzer, Andrea and Mertens, Mariano},
      title        = {{A}ircraft measurements of nitrous acid in excess of model
                      predictions in the boundary layer and free troposphere},
      reportid     = {FZJ-2021-00871},
      year         = {2020},
      abstract     = {<p>Middle and long-term $\&#160;photo-chemical$ effects of
                      local and regional pollution are not well quantified and are
                      an area of active study. NO<sub>x</sub> (here defined as NO,
                      NO<sub>2</sub>, and HONO) is a regional pollutant, which
                      influences atmospheric oxidation capacity and ozone
                      formation. Airborne measurements of atmospheric trace gases
                      from the HALO (High Altitude Long Range) aircraft,
                      particularly of NO, NO<sub>2</sub>, and HONO were performed
                      as part of the EMeRGe (Effect of Megacities on the Transport
                      and Transformation of Pollutants on the Regional to Global
                      Scales) campaign over continental Europe and southeast Asia
                      in July 2017 and April 2018, respectively. NO (and
                      NO<sub>Y</sub>), O<sub>3</sub>, and the photolysis
                      frequencies of NO<sub>2</sub> and HONO were measured
                      in-situ. NO<sub>2</sub> and HONO were inferred from Limb
                      measurements of the mini-DOAS (Differential Optical
                      Absorption Spectroscopy) instrument, using the novel scaling
                      method $(H\&#252;neke$ et al., 2017). These measurements
                      were compared with simulations of the MECO/EMAC models. In
                      relatively polluted air-masses in the boundary layer and
                      free troposphere, HONO measured in excess of model
                      predictions (and previous measurements) suggests an in-situ
                      formation and a significant source of OH as well as a
                      pathway for re-noxification. Aerosol composition
                      simultaneously measured $\&#160;by$ the C-Tof-AMS instrument
                      may reveal potential reaction mechanisms to explain the
                      $discrepancy.\&#160;</p>$},
      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-egu2020-13607},
      url          = {https://juser.fz-juelich.de/record/890290},
}