The relation of reflectance to backscatter and absorption parameters is investigated for waters more turbid than those of previous investigations. Experimental data are examined for river waters in which beam attenuation values range from 8.9 to 18.9 m(_1) at 550 nm. Attenuation, absorption, backscatter, and irradiance reflectance spectral properties are presented for wavelengths between 450 and 800 nm. Comparisons of reflectance with backscatter to absorption ratio and backscatter with absorption plus backscatter ratio indicate that data for turbid waters do not fit linear or polynomial models which are presently available in the literature.
Results from both field measurements and laboratory simulations are used to assess the effects of dissolved organic materials on turbid-water optical properties. Upwelled reflectance, attenuation, absorption, and b•ckscatter spectral properties at wavelengths from 450 to 800 nm are examined in relation to water chemistry. From these data it is clear that dissolved organic materials decrease upwelled reflectance from turbid waters. Depending on wavelength, the decrease in reflectance is a nonlinear function of concentration with largest gradients at low carbon concentrations. Large increases in absorption coefficient (particu!arly at blue wavelengths) are observed with increases in dissolved organic mate•al. Changes in backscatter coefficient are moderate, indicating mi•mal changes in particle scattering. Upwelled reflectance is highly correlated with two backs½•ttter-absorption parameters used in certain optical models. Both ba•gkscatter-absorption parameters prove to be nonlinear with dissolved organic material concentration change.
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