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Authors: Del Guasta, M.* 
Morandi, M.* 
Stefanutti, L.* 
Balestri, S.* 
Rizi, V.* 
Masci, F.* 
Stein, B.* 
Wedekind, C.* 
Mielke, B.* 
Immler, F.* 
Matthey, R.* 
Mitev, V.* 
Douart, M.* 
Title: Evidence for Liquid Droplets in a -65° Cold Cirrus Observed by LIDAR above Sodankyla (Finland) during SESAME
Editors: Pyle, J. A. 
Harrys, N. R. P. 
Amanatidis, G. T. 
Issue Date: 18-Sep-1995
Keywords: Polar Stratospheric Clouds
cirrus clouds
Subject Classification01. Atmosphere::01.01. Atmosphere::01.01.99. General or miscellaneous 
Abstract: It is widely accepted that pure water cannot exist as liquid below about -40°C. Theoretical and laboratory studies confirm this behavior for pure water . Nevertheless, liquid droplets have been seldom observed in cirrus clouds down to -50°C. Miltiwaveleght depolarization LIDAR tecnique can help ti hunt usually cold supercooled clouds. The presence of non-depolarizing cloud layers is indicative of scattering with ylindrical symmetry, possible both with spherical droplets and with ice plates horizontally oriented. In this work, a -65°C cold, non- depolarizing cloud observed in Finland is analysed, concluding thath supercooled droplets are responsible for the absence of depolarization in most of the layer.
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