Radiance and degree of linear polarization of the upwelling and the downwelling radiation just above and below a ruffled ocean surface in a model atmosphere-ocean system are computed at the wavelengths of 0.5 and 0.75 µm with the doubling-adding method. Computational results show that: (1) maximum degree of polarization (P_max)a nd radiance in the corresponding direction (R_max) f the upwelling radiation below the ocean surface are strongly dependent on the oceanic condition and that P_max is affected by the atmospheric condition. The effect of surface wind is negligible. (2) P_max and R_max of the downwelling radiation just above the ocean surface are strongly dependent on the atmospheric condition, but are little affected by oceanic and surface conditions. A combined measurement of P_max and R_max is expected to provide useful information to infer atmospheric and oceanic conditions.

© 1988 Optical Society of America

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