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@ARTICLE{Thiel:60089,
      author       = {Thiel, S. and Ammannato, L. and Bais, A. and Bandy, B. and
                      Blumthaler, M. and Bohn, B. and Engelsen, O. and Gobbi, G.
                      P. and Gröbner, J. and Jäkel, E. and Junkermann, W. and
                      Kazadzis, S. and Kift, R. and Kjeldstad, B. and Kouremeti,
                      N. and Kylling, A. and Mayer, B. and Monks, P. S. and
                      Reeves, C. E. and Schallhart, B. and Scheirer, R. and
                      Schmidt, S. and Schmitt, R. and Schreder, J. and Silbernagl,
                      R. and Topaloglou, C. and Thorseth, T. M. and Webb, A. R.
                      and Wendisch, M. and Werle, P.},
      title        = {{I}nfluence of clouds on the spectral actinic flux density
                      in the lower troposphere ({INSPECTRO}): overview of the
                      field campaigns},
      journal      = {Atmospheric chemistry and physics},
      volume       = {8},
      issn         = {1680-7316},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {PreJuSER-60089},
      pages        = {1789 - 1812},
      year         = {2008},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Ultraviolet radiation is the key factor driving
                      tropospheric photochemistry. It is strongly modulated by
                      clouds and aerosols. A quantitative understanding of the
                      radiation field and its effect on photochemistry is thus
                      only possible with a detailed knowledge of the interaction
                      between clouds and radiation. The overall objective of the
                      project INSPECTRO was the characterization of the
                      three-dimensional actinic radiation field under cloudy
                      conditions. This was achieved during two measurement
                      campaigns in Norfolk (East Anglia, UK) and Lower Bavaria
                      (Germany) combining space-based, aircraft and ground-based
                      measurements as well as simulations with the one-dimensional
                      radiation transfer model UVSPEC and the three-dimensional
                      radiation transfer model MYSTIC.During both campaigns the
                      spectral actinic flux density was measured at several
                      locations at ground level and in the air by up to four
                      different aircraft. This allows the comparison of measured
                      and simulated actinic radiation profiles. In addition
                      satellite data were used to complete the information of the
                      three dimensional input data set for the simulation. A
                      three-dimensional simulation of actinic flux density data
                      under cloudy sky conditions requires a realistic simulation
                      of the cloud field to be used as an input for the 3-D
                      radiation transfer model calculations. Two different
                      approaches were applied, to derive high- and low-resolution
                      data sets, with a grid resolution of about 100 m and 1 km,
                      respectively.The results of the measured and simulated
                      radiation profiles as well as the results of the ground
                      based measurements are presented in terms of photolysis rate
                      profiles for ozone and nitrogen dioxide. During both
                      campaigns all spectroradiometer systems agreed within +/-
                      $10\%$ if mandatory corrections e.g. stray light correction
                      were applied. Stability changes of the systems were below
                      $5\%$ over the 4 week campaign periods and negligible over a
                      few days. The J((OD)-D-1) data of the single monochromator
                      systems can be evaluated for zenith angles less than 70
                      degrees, which was satisfied by nearly all airborne
                      measurements during both campaigns. The comparison of the
                      airborne measurements with corresponding simulations is
                      presented for the total, downward and upward flux during
                      selected clear sky periods of both campaigns. The compliance
                      between the measured (from three aircraft) and simulated
                      downward and total flux profiles lies in the range of +/-
                      $15\%.$},
      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:000254416700023},
      doi          = {10.5194/acp-8-1789-2008},
      url          = {https://juser.fz-juelich.de/record/60089},
}