We use remote-sensing reflectance from particulate R-rs, to determine the volume absorption coefficient a of turbid water in the 400 < lambda < 700-nm spectral region. The calculated and measured values of a(lambda) show good agreement for 0.5 < a < 10 (m(-1)). To determine R-rs, from a particulate, we needed to make corrections for remote-sensing reflectance owing to surface roughness S-rs,. We determined the average spectral distribution of S-rs, from the difference in total remote-sensing reflectance measured with and without polarization. The spectral shape of S-rs, showed an excellent fit to theoretical formulas for glare based on Rayleigh and aerosol scattering from the atmosphere. (C) 1998 Optical Society of America. [References: 9]
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