Ocean inherent optical property determination from in-water light field measurements

An algorithm is described and evaluated for determining the absorption and backscattering coefficients a(z) and b(b)(z) from measurements of the nadir -viewing radiance L-u(z) and downward irradiance E-d(z). The method, derive d from radiative transfer theory, is similar to a previously proposed one f or E-u(z) and E-d(z), and both methods are demonstrated with numerical simu lations and field data. Numerical simulations and a sensitivity analysis sh ow that good estimates of a(z) and b(b)(t) can be obtained if the assumed s cattering phase function is approximately correct. In an experiment in Long Island Sound, estimates of a(z) derived with these methods agreed well wit h those obtained from an in situ reflecting tube instrument. (C) 1999 Optic al Society of America. OCIS codes: 010.4450, 030.5620, 160.4760, 290.3200, 290.1350.