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@ARTICLE{Rohrer:46664,
      author       = {Rohrer, F. and Bohn, B. and Brauers, T. and Brüning, D.
                      and Johnen, F.-J. and Wahner, A. and Kleffmann, J.},
      title        = {{C}haracterisation of the photolytic {HONO}-source in the
                      atmosphere simulation chamber {SAPHIR}},
      journal      = {Atmospheric chemistry and physics},
      volume       = {5},
      issn         = {1680-7316},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {PreJuSER-46664},
      pages        = {2189 - 2201},
      year         = {2005},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {HONO formation has been proposed as an important OH radical
                      source in simulation chambers for more than two decades.
                      Besides the heterogeneous HONO formation by the dark
                      reaction of NO2 and adsorbed water, a photolytic source has
                      been proposed to explain the elevated reactivity in
                      simulation chamber experiments. However, the mechanism of
                      the photolytic process is not well understood so far. As
                      expected, production of HONO and NOx was also observed
                      inside the new atmospheric simulation chamber SAPHIR under
                      solar irradiation. This photolytic HONO and NOx formation
                      was studied with a sensitive HONO instrument under
                      reproducible controlled conditions at atmospheric
                      concentrations of other trace gases. It is shown that the
                      photolytic HONO source in the SAPHIR chamber is not caused
                      by NO2 reactions and that it is the only direct NOy source
                      under illuminated conditions. In addition, the photolysis of
                      nitrate which was recently postulated for the observed
                      photolytic HONO formation on snow, ground, and glass
                      surfaces, can be excluded in the chamber. A photolytic HONO
                      source at the surface of the chamber is proposed which is
                      strongly dependent on humidity, on light intensity, and on
                      temperature. An empirical function describes these
                      dependencies and reproduces the observed HONO formation
                      rates to within 10 $\%.$ It is shown that the photolysis of
                      HONO represents the dominant radical source in the SAPHIR
                      chamber for typical tropospheric O-3/H2O concentrations. For
                      these conditions, the HONO concentrations inside SAPHIR are
                      similar to recent observations in ambient air.},
      keywords     = {J (WoSType)},
      cin          = {ICG-II},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB48},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000231157200003},
      url          = {https://juser.fz-juelich.de/record/46664},
}