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@ARTICLE{Wolf:859798,
      author       = {Wolf, Veronika and Kuhn, Thomas and Milz, Mathias and
                      Voelger, Peter and Krämer, Martina and Rolf, Christian},
      title        = {{A}rctic ice clouds over northern {S}weden: microphysical
                      properties studied with the {B}alloon-borne {I}ce {C}loud
                      particle {I}mager {B}-{ICI}244},
      journal      = {Atmospheric chemistry and physics},
      volume       = {18},
      number       = {23},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2019-00629},
      pages        = {17371 - 17386},
      year         = {2018},
      abstract     = {Ice particle and cloud properties such as particle size,
                      particle shape and number concentration influence the net
                      radiation effect of cirrus clouds. Measurements of these
                      features are of great interest for the improvement of
                      weather and climate models, especially for the Arctic
                      region. In this study, balloon-borne in situ measurements of
                      Arctic cirrus clouds have been analysed for the first time
                      with respect to their origin. Eight cirrus cloud
                      measurements have been carried out in Kiruna (68∘ N),
                      Sweden, using the Balloon-borne Ice Cloud particle Imager
                      (B-ICI). Ice particle diameters between 10 and 1200 µm
                      have been found and the shape could be recognized from
                      20 µm upwards. Great variability in particle size and
                      shape is observed. This cannot simply be explained by local
                      environmental conditions. However, if sorted by cirrus
                      origin, wind and weather conditions, the observed
                      differences can be assessed. Number concentrations between 3
                      and 400 L−1 have been measured, but the number
                      concentration has reached values above 100 L−1 only for
                      two cases. These two cirrus clouds are of in situ origin and
                      have been associated with waves. For all other measurements,
                      the maximum ice particle concentration is below 50 L−1
                      and for one in situ origin cirrus case only 3 L−1. In
                      the case of in situ origin clouds, the particles are all
                      smaller than 350 µm diameter. The PSDs for liquid origin
                      clouds are much broader with particle sizes between 10 and
                      1200 µm. Furthermore, it is striking that in the case of
                      in situ origin clouds almost all particles are compact
                      $(61 \%)$ or irregular $(25 \%)$ when examining the
                      particle shape. In liquid origin clouds, on the other hand,
                      most particles are irregular $(48 \%),$ rosettes
                      $(25 \%)$ or columnar $(14 \%).$ There are hardly any
                      plates in cirrus regardless of their origin. It is also
                      noticeable that in the case of liquid origin clouds the
                      rosettes and columnar particles are almost all hollow.},
      cin          = {IEK-7},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-7-20101013},
      pnm          = {244 - Composition and dynamics of the upper troposphere and
                      middle atmosphere (POF3-244)},
      pid          = {G:(DE-HGF)POF3-244},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000452384100002},
      doi          = {10.5194/acp-18-17371-2018},
      url          = {https://juser.fz-juelich.de/record/859798},
}