Abstract

Spectral in-water measurements of downward irradiance (E _d), upward irradiance (E _u), and nadir radiance ( L _u) are sufficient to calculate the scalar irradiances E ₀, E _0d, and E _0u, the average cosines μ, μ_d, and μ_u, the light absorption coefficient a, the backscattering coefficient b _b, and the so-called f factor that relates to R, a, and b _b. The solar elevation of 42° is a special case in which μ_d is independent of all variables except solar elevation. The algorithms are valid for solar elevations between 12° and 81° for horizontally stratified clear and turbid deep waters.

© 2001 Optical Society of America

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