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Angular Width Of The Downwelling Solar Radiance Profile As A Function Of Depth

The results are presented for an experiment in which the full angular width of the solar radiance distribution was measured at varying depths using a Silicon Intensified Target (SIT) underwater camera. The data show that for shallow depths, the width of the solar radiance distribution is strongly affected by the optical thickness of the cloud cover. In this experiment, under clear skies, as the depth increased from 27 to 677 ft, the angular width, full width at half maximum (FWHM), went from 35° to 59°. For very cloudy conditions, the solar radiance appears to be diffuse with an angular width of 62° FWHM even before striking the ocean's surface, and little change in angular width is observed from the surface to maximum depth.