Document Type

Article

Publication Date

6-1-2010

Abstract

The ice crystals can be produced by both turboprop and jet aircraft in and around supercooled liquid cloud layers. The crystals are produced by local adiabatic expansion at propeller tips at temperatures as warm as -8°C or over wing surfaces at temperatures <-20°C, and the resultant cooling chills droplets to a temperature of -37°C or below, causing the supercooled droplets to freeze through homogeneous nucleation. During research flights that measured cloud properties, the production of ice crystals from the passage of propeller aircraft at temperatures as warm as -8°C was documented. The production of aircraft-produced ice particles (APIP) by a turboprop passenger aircraft flying through a stratus layer at a temperature of about -10°C has been observed. The volume extinction coefficient σ in 2D probe sizes is also relatively high in the line echo compared to those found in the streamers. Wake turbulence is sufficient to produce holes of the size initially seen, but is unable to induce further spread.

DOI

10.1175/2009BAMS2905.1

Comments

© Copyright 2010 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act September 2010 Page 2 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC §108, as revised by P.L. 94-553) does not require the AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a web site or in a searchable database, or other uses of this material, except as exempted by the above statement, requires written permission or a license from the AMS. Additional details are provided in the AMS Copyright Policy, available on the AMS Web site located at (http://www.ametsoc.org/) or from the AMS at 617-227-2425 or copyrights@ametsoc.org.

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