Refinements to the treatment of ice particle mass dimensional relationships for ice clouds: Part II: Evaluation and parameterizations of ensemble ice particle sedementation velocities

AMS Citation:
Heymsfield, A. J., G. -J. Van Zadelhoff, D. P. Donovan, F. Fabry, R. J. Hogan, and A. J. Illingworth, 2007: Refinements to the treatment of ice particle mass dimensional relationships for ice clouds: Part II: Evaluation and parameterizations of ensemble ice particle sedementation velocities. Journal of the Atmospheric Sciences, 64, 1068-1088, doi:10.1175/JAS3900.1.
Date:2007-04-01
Resource Type:article
Title:Refinements to the treatment of ice particle mass dimensional relationships for ice clouds: Part II: Evaluation and parameterizations of ensemble ice particle sedementation velocities
Abstract: This two-part study addresses the development of reliable estimates of the mass and fall speed of single ice particles and ensembles. Part I of the study reports temperature-dependent coefficients for the mass-dimensional relationship, m = aDb, where D is particle maximum dimension. The fall velocity relationship, Vt = ADB, is developed from observations in synoptic and low-latitude, convectively generated, ice cloud layers, sampled over a wide range of temperatures using an assumed range for the exponent b. Values for a, A, and B were found that were consistent with the measured particle size distributions (PSD) and the ice water content (IWC). To refine the estimates of coefficients a and b to fit both lower and higher moments of the PSD and the associated values for A and B, Part II uses the PSD from Part I plus coincident, vertically pointing Doppler radar returns. The observations and derived coefficients are used to evaluate earlier, single-moment, bulk ice microphysical parameterization schemes as well as to develop improved, statistically based, microphysical relationships. They may be used in cloud and climate models, and to retrieve cloud properties from ground-based Doppler radar and spaceborne, conventional radar returns.
Peer Review:Refereed
Copyright Information:Copyright 2007 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 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work.
OpenSky citable URL: ark:/85065/d7q52pvm
Publisher's Version: 10.1175/JAS3900.1
Author(s):
  • Andrew Heymsfield - NCAR/UCAR
  • Gerd-Jan van Zadelhoff
  • David Donovan
  • Frederic Fabry
  • Robin Hogan
  • Anthony Illingworth
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