DOI: 10.1615/ICHMT.2007.ConfElectromagLigScat
ISBN Print: 978-1-56700-244-7
Backscattering linear depolarization ratio of laboratory generated ice clouds composed of pristine and complex-shaped ice crystals
RESUMO
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.