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@ARTICLE{Rosati:278668,
      author       = {Rosati, B. and Herrmann, E. and Bucci, S. and Fierli, F.
                      and Cairo, F. and Gysel, M. and Tillmann, R. and Größ, J.
                      and Gobbi, G. P. and Di Liberto, L. and Di Donfrancesco, G.
                      and Wiedensohler, A. and Weingartner, E. and Virtanen, A.
                      and Mentel, T. F. and Baltensperger, U.},
      title        = {{C}omparison of vertical aerosol extinction coefficients
                      from in-situ and {LIDAR} measurements},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {15},
      number       = {13},
      issn         = {1680-7375},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2015-06993},
      pages        = {18609 - 18651},
      year         = {2015},
      abstract     = {Vertical profiles of aerosol optical properties were
                      explored in a case study near the San Pietro Capofiume (SPC)
                      ground station during the PEGASOS Po Valley campaign in the
                      summer of 2012. A Zeppelin NT airship was employed to
                      investigate the effect of the dynamics of the planetary
                      boundary layer at altitudes between ~ 50–800 m above
                      ground. Determined properties included the aerosol size
                      distribution, the hygroscopic growth factor, the effective
                      index of refraction and the light absorption coefficient.
                      The first three parameters were used to retrieve the light
                      scattering coefficient. Simultaneously, direct measurements
                      of both the scattering and absorption coefficient were
                      carried out at the SPC ground station. Additionally, a LIDAR
                      system provided aerosol extinction coefficients for a
                      vertically resolved comparison between in-situ and remote
                      sensing results. First, the airborne results at low
                      altitudes were validated with the ground measurements.
                      Agreement within approximately ±25 and $±20\%$ was found
                      for the dry scattering and absorption coefficient,
                      respectively. The single scattering albedo, ranged between
                      0.83 to 0.95, indicating the importance of the absorbing
                      particles in the Po Valley region. A clear layering of the
                      atmosphere was observed during the beginning of the flight
                      (until ~ 10 local time) before the mixed layer (ML) was
                      fully developed. Highest extinction coefficients were found
                      at low altitudes, in the new ML, while values in the
                      residual layer, which could be probed at the beginning of
                      the flight at elevated altitudes, were lower. At the end of
                      the flight (after ~ 12 local time) the ML was fully
                      developed, resulting in constant extinction coefficients at
                      all altitudes measured on the Zeppelin NT. LIDAR results
                      captured these dynamic features well and good agreement was
                      found for the extinction coefficients compared to the
                      in-situ results, using fixed LIDAR ratios (LR) between 30
                      and 70 sr for the altitudes probed with the Zeppelin. These
                      LR are consistent with values for continental aerosol
                      particles that can be expected in this region.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {243 - Tropospheric trace substances and their
                      transformation processes (POF3-243)},
      pid          = {G:(DE-HGF)POF3-243},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/acpd-15-18609-2015},
      url          = {https://juser.fz-juelich.de/record/278668},
}