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Backscattering linear depolarization ratio of laboratory generated ice clouds composed of pristine and complex-shaped ice crystals

DOI: 10.1615/ICHMT.2007.ConfElectromagLigScat.510
pages 193-196

Martin Schnaiter
Forschungszentrum Karlsruhe, Institute of Meteorology and Climate Research, PO Box 3640, 76021 Karlsruhe, Germany

Roland Schon
Forschungszentrum Karlsruhe, Institute of Meteorology and Climate Research, PO Box 3640, 76021 Karlsruhe, Germany

Ottmar Mohler
Forschungszentrum Karlsruhe, Institute of Meteorology and Climate Research, PO Box 3640, 76021 Karlsruhe, Germany

Harald Saathoff
Forschungszentrum Karlsruhe, Institute of Meteorology and Climate Research, PO Box 3640, 76021 Karlsruhe, Germany

Robert Wagner
Forschungszentrum Karlsruhe, Institute of Meteorology and Climate Research, PO Box 3640, 76021 Karlsruhe, Germany

Аннотация

Artificial ice clouds have been generated in the laboratory by using the large cloud simulation chamber AIDA of Forschungszentrum Karlsruhe. Experiments have been conducted in the 0C to −30C temperature range. Temperature and saturation ratio regimes with distinct predominating ice crystal habits in a varying ice crystal complexity could be identified by probing the ice clouds with a contact-free, single particle imaging device developed in our institute. Backscattering linear depolarization ratio measurements have been performed on the overall ice cloud simultaneously to single ice crystal characterization. A clear dependence of the linear backscattering depolarization ratio on the ice crystal habit was observed. Ice clouds composed predominantly of compact columnar crystals exhibit a higher depolarization ratio than clouds composed of thin plate-like crystals. Ice crystal growth at high ice saturation ratios increases the particle complexity and lowers the depolarization ratio.

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