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@ARTICLE{Roelofs:12513,
      author       = {Roelofs, G.-J. and ten Brink, H. and Kiendler-Scharr, A.
                      and de Leeuw, G. and Mensah, A. and Minikin, A. and Otjes,
                      R.},
      title        = {{E}valuation of simulated aerosol properties with the
                      aerosol-climate model {ECHAM}5-{HAM} using observations from
                      the {IMPACT} field compaign},
      journal      = {Atmospheric chemistry and physics},
      volume       = {10},
      issn         = {1680-7316},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {PreJuSER-12513},
      pages        = {7709 - 7722},
      year         = {2010},
      note         = {We thank Sebastian Rast from the Max Planck Institute for
                      Meteorology in Hamburg for his help with the nudging
                      procedure. We thank SARA Reken- en Netwerkdiensten in
                      Amsterdam for use of their supercomputer, and acknowledge
                      the use of the Ferret program for the graphics
                      (www.ferret.noaa.gov). We acknowledge AERONET for use of
                      their data and their effort in establishing and maintaining
                      the Cabauw site. This work has been partly funded by EUCAARI
                      (European Integrated project on Aerosol Cloud Climate and
                      Air Quality interactions) No. 036833-2.},
      abstract     = {In May 2008, the measurement campaign IMPACT for
                      observation of atmospheric aerosol and cloud properties was
                      conducted in Cabauw, The Netherlands. With a nudged version
                      of the coupled aerosol-climate model ECHAM5-HAM we simulate
                      the size distribution and chemical composition of the
                      aerosol and the associated aerosol optical thickness (AOT)
                      for the campaign period. Synoptic scale meteorology is
                      represented realistically through nudging of the vorticity,
                      the divergence, the temperature and the surface pressure.
                      Simulated concentrations of aerosol sulfate and organics at
                      the surface are generally within a factor of two from
                      observed values. The monthly averaged AOT from the model is
                      0.33, about $20\%$ larger than observed. For selected
                      periods of the month with relatively dry and moist
                      conditions discrepancies are approximately $-30\%$ and
                      $+15\%,$ respectively. Discrepancies during the dry period
                      are partly caused by inaccurate representation of boundary
                      layer (BL) dynamics by the model affecting the simulated
                      AOT. The model simulates too strong exchange between the BL
                      and the free troposphere, resulting in weaker concentration
                      gradients at the BL top than observed for aerosol and
                      humidity, while upward mixing from the surface layers into
                      the BL appears to be underestimated. The results indicate
                      that beside aerosol sulfate and organics also aerosol
                      ammonium and nitrate significantly contribute to aerosol
                      water uptake. The simulated day-to-day variability of AOT
                      follows synoptic scale advection of humidity rather than
                      particle concentration. Even for relatively dry conditions
                      AOT appears to be strongly influenced by the diurnal cycle
                      of RH in the lower boundary layer, further enhanced by
                      uptake and release of nitric acid and ammonia by aerosol
                      water.},
      keywords     = {J (WoSType)},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK491},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000281432800013},
      doi          = {10.5194/acp-10-7709-2010},
      url          = {https://juser.fz-juelich.de/record/12513},
}