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Parameterization of Shortwave Cloud Optical Properties for a Mixture of Ice Particle Habits for use in Atmospheric ModelsBased on the single-scattering optical properties pre-computed with an improved geometric optics method, the bulk absorption coefficient, single-scattering albedo, and asymmetry factor of ice particles have been parameterized as a function of the effective particle size of a mixture of ice habits, the ice water amount, and spectral band. The parameterization has been applied to computing fluxes for sample clouds with various particle size distributions and assumed mixtures of particle habits. It is found that flux calculations are not overly sensitive to the assumed particle habits if the definition of the effective particle size is consistent with the particle habits that the parameterization is based. Otherwise, the error in the flux calculations could reach a magnitude unacceptable for climate studies. Different from many previous studies, the parameterization requires only an effective particle size representing all ice habits in a cloud layer, but not the effective size of individual ice habits.
Document ID
20020081016
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Chou, Ming-Dah
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Lee, Kyu-Tae
(National Kangnung University Kangnung Korea, Republic of)
Yang, Ping
(Texas A&M Univ. College Station, TX United States)
Lau, William K. M.
Date Acquired
August 20, 2013
Publication Date
January 1, 2002
Subject Category
Meteorology And Climatology
Meeting Information
Meeting: American Meteorological Society 11th Conference on Atmospheric Radiation
Location: Ogden, UT
Country: United States
Start Date: June 3, 2002
End Date: June 7, 2002
Sponsors: American Meteorological Society
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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