Transmittance

Instrument: Analytical Spectral Devices Ice-1 spectroradiometer. 
File format: Files are in the subdirectory TRANSMITTANCE 
of the OPTICS directory. Filenames are TRNXXXX where XXXX is 
the date. The file contains information on what kind of ice it was.
Contact: perovich@crrel.usace.army.mil

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 a 
spectral range from 380 nm to 860 nm. For transmission measurements 
the effective range was 400 to 750 nm. It is a dual channel 
instrument with separate detectors for above and below the ice. Fiber 
optics probes are used to transmit the from the cosine collectors to 
the CCD detector array.