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Surface roughness considerations for atmospheric correction of ocean color sensors. I - The Rayleigh-scattering component. II - Error in the retrieved water-leaving radianceThe first step in the Coastal Zone Color Scanner (CZCS) atmospheric-correction algorithm is the computation of the Rayleigh-scattering (RS) contribution, L sub r, to the radiance leaving the top of the atmosphere over the ocean. In the present algorithm, L sub r is computed by assuming that the ocean surface is flat. Calculations of the radiance leaving an RS atmosphere overlying a rough Fresnel-reflecting ocean are presented to evaluate the radiance error caused by the flat-ocean assumption. Simulations are carried out to evaluate the error incurred when the CZCS-type algorithm is applied to a realistic ocean in which the surface is roughened by the wind. In situations where there is no direct sun glitter, it is concluded that the error induced by ignoring the Rayleigh-aerosol interaction is usually larger than that caused by ignoring the surface roughness. This suggests that, in refining algorithms for future sensors, more effort should be focused on dealing with the Rayleigh-aerosol interaction than on the roughness of the sea surface.
Document ID
19920066946
Document Type
Reprint (Version printed in journal)
Authors
Gordon, Howard R. (NASA Headquarters Washington, DC United States)
Wang, Menghua (Miami, University Coral Gables, FL, United States)
Date Acquired
August 15, 2013
Publication Date
July 20, 1992
Publication Information
Publication: Applied Optics
Volume: 31
Issue: 21 J
ISSN: 0003-6935
Subject Category
SPACECRAFT INSTRUMENTATION
Funding Number(s)
CONTRACT_GRANT: NAGW-273
CONTRACT_GRANT: NAS5-30911
Distribution Limits
Public
Copyright
Other