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@ARTICLE{Wolf:852464,
      author       = {Wolf, Veronika and Kuhn, Thomas and Milz, Mathias and
                      Voelger, Peter and Krämer, Martina and Rolf, Christian},
      title        = {{I}ce particle properties of {A}rctic cirrus},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {},
      issn         = {1680-7375},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2018-05410},
      pages        = {1 - 18},
      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 were carried out in Kiruna (68°N), Sweden. Ice
                      particle diameters between 10μm and 1200μm were found and
                      the shape could be recognised from 20μm upwards. Great
                      variability in particle size and shape was 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/L and 400/L were
                      measured, but only for two cases the number concentration
                      reached values above 100/L. These two cirrus clouds were of
                      in-situ origin and were caused by gravity and mountain
                      lee-waves. For all other measurements, the maximum ice
                      particle concentration was below 50/L and for one in-situ
                      origin cirrus case only 3/L. In the case of in-situ origin
                      clouds, the particles were all smaller than 350μm diameter.
                      The number size distribution for liquid origin clouds was
                      much broader with particle sizes between 10μm and 1200μm.
                      Furthermore, it is striking that in the case of in-situ
                      origin clouds almost all particles were compact $(61\%)$ or
                      irregular $(25\%)$ when examining the particle shape. In
                      liquid origin clouds, on the other hand, most particles were
                      irregular $(48\%),$ rosettes $(25\%)$ or columnar $(14\%).$
                      There were 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 were
                      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},
      doi          = {10.5194/acp-2018-386},
      url          = {https://juser.fz-juelich.de/record/852464},
}