Light reflection from a sea-ice cover during the onset of summer melt

Donald K. Perovich; John W. Govoni

doi:10.1117/12.140681

31 December 1992 Light reflection from a sea-ice cover during the onset of summer melt

Donald K. Perovich, John W. Govoni

Proceedings Volume 1750, Ocean Optics XI; (1992) https://doi.org/10.1117/12.140681
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

A knowledge of the reflection of light from a sea ice cover is important for both the interpretation of remote sensing imagery at visible and near-infrared wavelengths and for climatological studies involving the energy balance of the polar regions. Spectral measurements of albedo, bidirectional reflectance function (BDRF), and polarized reflectance were made for sea ice conditions found during the onset of melt in the Canadian Arctic. The wavelength region studied was from the ultraviolet to the near infrared (370 - 1000 nm). Results for five surface types are presented: (1) dry snow, (2) dry snow with a glazed surface, (3) bare ice, (4) blue ice, and (5) a melt pond. Results indicate that spectral albedos decrease at all wavelengths as the melt season progresses and the surface conditions evolve from (1) through (5), and that the decrease is most pronounced at longer wavelengths. Reflectance data suggest that (1) at most angles reflectance has the same spectral shape as albedo, (2) at 30 degree(s) elevation reflectance is for the most part azimuthally isotropic and (3) at 60 degree(s) elevation a significant specular component was evident at 0 degree(s) azimuth, especially for the bare ice case.

Citation Download Citation

Donald K. Perovich and John W. Govoni "Light reflection from a sea-ice cover during the onset of summer melt", Proc. SPIE 1750, Ocean Optics XI, (31 December 1992); https://doi.org/10.1117/12.140681

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