We have reexamined the contribution of Raman scattering to the water-leaving radiance in case l waters by carrying out radiative transfer simulations that combine the latest,~reported measurements of the absorption coefficient of pure water with direct measurements of the spectral variation of the Raman-scattering coefficient. The resulting contribution of Raman scattering is then compared with experimental measurements of the water-leaving radiance, and the fractional contribution of radiance produced by Raman scattering to the total radiance measured at a given wavelength is determined. The results show that (1) the contribution of Raman scattering te the water-leaving radiance in an ocean of pure seawater is as much as 50-100% larger than earlier predictions, and (2) the Raman contribution does not decay as rapidly with increasing concentrations of chlorophyllouslike pigments C as predicted earlier. In fact, the Raman fraction for C # 1 mg/m↑(3) is approximately #8% at wavelengths o interest in ocean color remote sensing and therefore cannot be ignored in ocean color modeling.#1999 Optical Society of America OCIS codes: 280.0280, 010.4450, 010.7340, 290.5860.
展开▼
