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Proceedings Paper

Absorption and scattering coefficient estimation with asymptotic apparent optical properties
Author(s): R. A. Leathers; Norman J. McCormick
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Paper Abstract

In deep, homogeneous waters with no internal sources at a particular wavelength, the vertical profiles of the reflectance R(z) and the downward diffuse attentuation coefficient Kd(z) approach asymptotic values that are inherent optical properties (IOPs) of the water. The apparent optical properties R(z) and Kd(z) are obtained from the upward and downward monospectral irradiance measurements Eu(z) and Ed(z) that are commonly available to optical oceanographers. Given a specific scattering phase function, there are unique correlations between these asymptotic IOPs and the absorption and scattering coefficients a and b that can be derived from the radiative transfer equation. Here we evaluate a method for first determining the asymptotic IOPs from Eu(z) and Ed(z) and then using the correlations to estimate the absorption and scattering coefficients a and b. At depths near the asymptotic radiance regime, both R(z) and Kd(z) can be fitted to a three-parameter model that sometimes helps in the determination of the asymptotic IOPs. A good estimation of a can be obtained from the asymptotic IOPs even when the scattering phase function is unknown; however, estimates of b are highly dependent on the assumed phase function.

Paper Details

Date Published: 6 February 1997
PDF: 5 pages
Proc. SPIE 2963, Ocean Optics XIII, (6 February 1997); doi: 10.1117/12.266449
Show Author Affiliations
R. A. Leathers, University of Washington (United States)
Norman J. McCormick, University of Washington (United States)

Published in SPIE Proceedings Vol. 2963:
Ocean Optics XIII
Steven G. Ackleson; Robert J. Frouin, Editor(s)

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