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000859798 1001_ $$0P:(DE-HGF)0$$aWolf, Veronika$$b0$$eCorresponding author
000859798 245__ $$aArctic ice clouds over northern Sweden: microphysical properties studied with the Balloon-borne Ice Cloud particle Imager B-ICI244
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000859798 520__ $$aIce 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.
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000859798 7001_ $$00000-0003-3701-7925$$aKuhn, Thomas$$b1
000859798 7001_ $$0P:(DE-HGF)0$$aMilz, Mathias$$b2
000859798 7001_ $$0P:(DE-HGF)0$$aVoelger, Peter$$b3
000859798 7001_ $$0P:(DE-Juel1)129131$$aKrämer, Martina$$b4
000859798 7001_ $$0P:(DE-Juel1)139013$$aRolf, Christian$$b5
000859798 773__ $$0PERI:(DE-600)2069847-1$$a10.5194/acp-18-17371-2018$$gVol. 18, no. 23, p. 17371 - 17386$$n23$$p17371 - 17386$$tAtmospheric chemistry and physics$$v18$$x1680-7324$$y2018
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