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Scattering by nonspherical particles of size comparable to wavelength - A new semi-empirical theory and its application to tropospheric aerosolsA semiempirical theory is developed which is based on simple physical principles and comparisons with laboratory measurements. The ultimate utility of this approach rests on its ability to successfully reproduce the observed single-scattering phase function for a wide variety of particle shapes, sizes and refractive indices. This approximate theory is developed for evaluating the interaction of randomly oriented, nonspherical particles with the total intensity component of electromagnetic radiation. Mie theory is used when the particle size parameter x (ratio of particle circumference to wavelength) is less than some upper bound x sub zero (about 5). For x greater than x sub zero, the interaction is divided into three components: diffraction, external reflection and transmission. The application of the theory is illustrated by considering the influence of the shape of tropospheric aerosols on their contribution to the earth's global albedo.
Document ID
19800051870
Document Type
Reprint (Version printed in journal)
Authors
Pollack, J. B. (NASA Ames Research Center Moffett Field, CA, United States)
Cuzzi, J. N. (NASA Ames Research Center Space Sciences Div., Moffett Field, Calif., United States)
Date Acquired
August 10, 2013
Publication Date
April 1, 1980
Publication Information
Publication: Journal of the Atmospheric Sciences
Volume: 37
Subject Category
GEOPHYSICS
Distribution Limits
Public
Copyright
Other