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@ARTICLE{Rosati:811716,
      author       = {Rosati, Bernadette and Herrmann, Erik and Bucci, Silvia and
                      Fierli, Federico and Cairo, Francesco and Gysel, Martin and
                      Tillmann, Ralf and Größ, Johannes and Gobbi, Gian Paolo
                      and Di Liberto, Luca and Di Donfrancesco, Guido and
                      Wiedensohler, Alfred and Weingartner, Ernest and Virtanen,
                      Annele and Mentel, Thomas F. and Baltensperger, Urs},
      title        = {{S}tudying the vertical aerosol extinction coefficient by
                      comparing in situ airborne data and elastic backscatter
                      lidar},
      journal      = {Atmospheric chemistry and physics},
      volume       = {16},
      number       = {7},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2016-04100},
      pages        = {4539 - 4554},
      year         = {2016},
      abstract     = {Vertical profiles of aerosol particle 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 and 800 m
                      above ground. Determined properties included the aerosol
                      particle 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 single wavelength polarization diversity
                      elastic lidar system provided estimates of aerosol
                      extinction coefficients using the Klett method to accomplish
                      the inversion of the signal, for a vertically resolved
                      comparison between in situ and remote-sensing results. Note,
                      however, that the comparison was for the most part done in
                      the altitude range where the overlap function is incomplete
                      and accordingly uncertainties are larger. 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 and 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 ∼  10:00 LT – local time)
                      before the mixing 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
                      ∼  12:00 LT) the ML was fully developed, resulting
                      in constant extinction coefficients at all altitudes
                      measured on the Zeppelin NT. Lidar estimates 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},
      UT           = {WOS:000374703000019},
      doi          = {10.5194/acp-16-4539-2016},
      url          = {https://juser.fz-juelich.de/record/811716},
}