A method for determining the ocean-bottom optical albedo R↓(b) from in-water upward and downward irradiance measurements at a shallow site is presented, tested, and compared with a more familiar approach that requires additional measurements at a nearby deep-water site. Also presented are two new algorithms for estimating R↓(b)from measurements of the downward irradiance and vertically upward radiance. All methods performed well in numerical situations at depths at which the.influence of the bottom on the light field was significant. # 1999 Optical Society of America OCIS codes: 010.4450, 030.5620, 100.3190.
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