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Applied Optics

Applied Optics


  • Vol. 36, Iss. 30 — Oct. 20, 1997
  • pp: 7887–7897

Remote sensing of ocean color: assessment of water-leaving radiance bidirectional effects on atmospheric diffuse transmittance

Haoyu Yang and Howard R. Gordon  »View Author Affiliations

Applied Optics, Vol. 36, Issue 30, pp. 7887-7897 (1997)

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Two factors influence the diffuse transmittance (t) of water-leaving radiance (Lw) to the top of the atmosphere: the angular distribution of upwelling radiance beneath the sea surface (Lu) and the concentration and optical properties of aerosols in the atmosphere. We examine these factors and (1) show that the error in Lw that is induced by assuming Lu is uniform (i.e., in treating the subsurface reflectance by the water body as Lambertian) is significant in comparison with the other errors expected in Lw only at low phytoplankton concentration and then only in the blue region of the spectrum; (2) show that when radiance ratios are used in biophysical algorithms the effect of the uniform- Lu approximation is even smaller; and (3) provide an avenue for introducing accurate computation of the uniform Lu diffuse transmittance into atmospheric correction algorithms. In an Appendix the reciprocity principle is derived for a medium in which the refractive index is a continuous function of position.

© 1997 Optical Society of America

Original Manuscript: November 14, 1996
Revised Manuscript: April 24, 1997
Published: October 20, 1997

Haoyu Yang and Howard R. Gordon, "Remote sensing of ocean color: assessment of water-leaving radiance bidirectional effects on atmospheric diffuse transmittance," Appl. Opt. 36, 7887-7897 (1997)

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