Proceedings PaperDownwelling irradiance fluctuations in the small-angle approximation
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Mean and rrns fluctuations of downwelling solar irradiance below a rough ocean surface have been modelled using the small-angle approximation for the in-water radiance distribution. For comparison, a ray-trace approach has also been used to calculate the fluctuation statistics in the limit of no scattering. The mean irradiance decays rapidly near the surface, and at a sufficiently large depth (determined by the water optical properties) is within a few percent of the irradiance for a flat ocean surface. Although rims fluctuations decay with depth as well, their magnitude relative to the mean irradiance reaches a nonzero asymptotic value which depends on the sun position, optical properties, and surface roughness.