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@ARTICLE{Schween:187195,
      author       = {Schween, J. H. and Hirsikko, A. and Löhnert, U. and
                      Crewell, S.},
      title        = {{M}ixing-layer height retrieval with ceilometer and
                      {D}oppler lidar: from case studies to long-term assessment},
      journal      = {Atmospheric measurement techniques},
      volume       = {7},
      number       = {11},
      issn         = {1867-8548},
      address      = {Katlenburg-Lindau},
      publisher    = {Copernicus},
      reportid     = {FZJ-2015-00869},
      pages        = {3685 - 3704},
      year         = {2014},
      abstract     = {Aerosol signatures observed by ceilometers are frequently
                      used to derive mixing-layer height (MLH) which is an
                      essential variable for air quality modelling. However,
                      Doppler wind lidar measurements of vertical velocity can
                      provide a more direct estimation of MLH via simple
                      thresholding. A case study reveals difficulties in the
                      aerosol-based MLH retrieval during transition times when the
                      mixing layer builds up in the morning and when turbulence
                      decays in the afternoon. The difficulties can be explained
                      by the fact that the aerosol distribution is related to the
                      history of the mixing process and aerosol characteristics
                      are modified by humidification. The results of the case
                      study are generalized by evaluating one year of joint
                      measurements by a Vaisala CT25K and a HALO Photonics
                      Streamline wind lidar. On average the aerosol-based
                      retrieval gives higher MLH than the wind lidar with an
                      overestimation of MLH by about 300 m (600 m) in the morning
                      (late afternoon). Also, the daily aerosol-based maximum MLH
                      is larger and occurs later during the day and the average
                      morning growth rates are smaller than those derived from the
                      vertical wind. In fair weather conditions classified by less
                      than 4 octa cloud cover the mean diurnal cycle of cloud base
                      height corresponds well to the mixing-layer height showing
                      potential for a simplified MLH estimation.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {233 - Trace gas and aerosol processes in the troposphere
                      (POF2-233)},
      pid          = {G:(DE-HGF)POF2-233},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000345781000005},
      doi          = {10.5194/amt-7-3685-2014},
      url          = {https://juser.fz-juelich.de/record/187195},
}