Abstract
Abstract This study presents observational data that are used to relate the cross-sectional area of an ice particle to its maximum diameter (D), for a number of individual particle habits and for natural mixed habit populations of ice particles in midlatitude, continental, synoptically generated cirrus clouds. The cross-sectional area is expressed in terms of the shape-sensitive parameter “area ratio” (Ar), which is the ratio of a particle's projected cross-sectional area to the area of a circle having the particle's maximum diameter. The Ar(D) relationships for particles of a specific habit are derived from several diverse datasets, including high-resolution Cloud Particle Imager (CPI), Particle Measuring System, Inc., 2D-C (cloud) and 2D-P (precipitation) probes and balloon-borne replicator in situ data in the temperature range −25°C to −65°C, ice particles collected at the surface, and ice particles grown in a wind tunnel. The Ar(D) relationships for cirrus clouds are derived from CPI, 2D-C, and 2D-P d...
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