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@ARTICLE{Stemmler:57703,
      author       = {Stemmler, K. and Ndour, M. and Elshorbany, Y. and
                      Kleffmann, J. and D'Anna, B. and George, C. and Bohn, B. and
                      Ammann, M.},
      title        = {{L}ight induced conversion of nitrogen dioxide into nitrous
                      acid on submicron humic acid aerosol},
      journal      = {Atmospheric chemistry and physics},
      volume       = {7},
      issn         = {1680-7316},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {PreJuSER-57703},
      pages        = {4237 - 4248},
      year         = {2007},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The interactions of aerosols consisting of humic acids with
                      gaseous nitrogen dioxide (NO2) were investigated under
                      different light conditions in aerosol flow tube experiments
                      at ambient pressure and temperature. The results show that
                      NO2 is converted on the humic acid aerosol into nitrous acid
                      (HONO), which is released from the aerosol and can be
                      detected in the gas phase at the reactor exit. The formation
                      of HONO on the humic acid aerosol is strongly activated by
                      light: In the dark, the HONO-formation was below the
                      detection limit, but it was increasing with the intensity of
                      the irradiation with visible light. Under simulated
                      atmospheric conditions with respect to the actinic flux,
                      relative humidity and NO2-concentration, reactive uptake
                      coefficients gamma(rxn) for the NO2 -> HONO conversion on
                      the aerosol between gamma(rxn) < 10(-7) (in the dark) and
                      gamma(rxn)=6x 10(-6) were observed. The observed uptake
                      coefficients decreased with increasing NO2-concentration in
                      the range from 2.7 to 280 ppb and were dependent on the
                      relative humidity (RH) with slightly reduced values at low
                      humidity (< $20\%$ RH) and high humidity (> $60\%$ RH). The
                      measured uptake coefficients for the NO2 -> HONO conversion
                      are too low to explain the HONO-formation rates observed
                      near the ground in rural and urban environments by the
                      conversion of NO2 -> HONO on organic aerosol surfaces, even
                      if one would assume that all aerosols consist of humic acid
                      only. It is concluded that the processes leading to HONO
                      formation on the Earth surface will have a much larger
                      impact on the HONO-formation in the lowermost layer of the
                      troposphere than humic materials potentially occurring in
                      airborne particles.},
      keywords     = {J (WoSType)},
      cin          = {ICG-2},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB791},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK406},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000249072900005},
      doi          = {10.5194/acp-7-4237-2007},
      url          = {https://juser.fz-juelich.de/record/57703},
}