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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
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.
Appears in Collections:Conference materials
01.01.99. General or miscellaneous

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