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@ARTICLE{Koepke:12494,
      author       = {Koepke, P. and Garhammer, M. and Hess, M. and Roeth, E.-P.},
      title        = {{NO}2 photolysis frequencies in street canyons},
      journal      = {Atmospheric chemistry and physics},
      volume       = {10},
      issn         = {1680-7316},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {PreJuSER-12494},
      pages        = {7457 - 7466},
      year         = {2010},
      note         = {Financial support by the German Umweltbundesamt under
                      UFOPLAN Grant 370942207 is gratefully acknowledged.},
      abstract     = {Photolysis frequencies for NO2 are modeled for the
                      conditions in urban streets, which are taken into account as
                      canyons with variable height and width. The effect of a
                      street canyon is presented with absolute values and as a
                      ratio RJ of the photolysis frequency within the street
                      compared to that with free horizon. This allows further use
                      of the existing photolysis parameterizations. Values are
                      presented for variable solar elevation and azimuth angles,
                      varying atmospheric conditions and different street
                      properties. The NO2 photolysis frequency in a street depends
                      strongly on the relative width of the street and its
                      orientation towards the sun. Averaged over atmospheric
                      conditions and street orientation, the NO2 photolysis
                      frequency is reduced in comparison with the values for free
                      horizon: to less than $20\%$ for narrow skyscraper streets,
                      to about $40\%$ for typical urban streets, and only to about
                      $80\%$ for garden streets. A parameterization with the
                      global solar irradiance is given for the averaged RJ
                      values.},
      keywords     = {J (WoSType)},
      cin          = {IEK-7},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-7-20101013},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK491},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000280847700032},
      doi          = {10.5194/acpd-10-12827-2010},
      url          = {https://juser.fz-juelich.de/record/12494},
}