Light Transmittance

While measuring albedo was the primary focus of the optical program, we were also interested in determining the the amount of solar energy transmitted through the ice cover. We measured spectral transmittance for a variety of ice types, including cold snow-covered ice, melting snow-covered ice, bare ice, melting ice, ponded ice, and leads.

Light transmittance measurements were made using an Analytical Spectral Devices Ice-1 spectroradiometer. This instrument had an effective spectral range from 380 nm to 860 nm. It is a dual channel instrument with separate detectors for above and below the ice. Fiberoptics probes are used to transmit the light from the cosine collectors to the CCD detector array.

Sensor intercalibration at white ice site.

Albedo    Spectral albedos   Wavelength-integrated albedo    UV incident   In-ice irradiance

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