Instrument: Spectron Engineering SE-590 spectroradiometer.
Uncertainty: +/- 0.01
File format: Files are in the subdirectory SPECALB of the 
OPTICS directory. ASCII files containing spectral albedo 
observations along the albedo line. The filename convention 
is ALBxmmdd.csv where mm is month, dd is dat and x has three options, 
U for ultraviolet (300-400 nm), V for visible (400-1000 nm), and 
I for infrared (1000-2200 nm). The first line of these files has the 
date, the second the positions along the albedo line, and the 
following lines contain wavelength followed by albedos along the 
line. There is also a file ALBVmisc.csv that contains miscellaneous 
spectral albedos.
Contacts: perovich@crrel.army.mil    tcg@atmos.washington.edu 


As part of ice-albedo feedback studies during SHEBA, we measured 
spectral and wavelength-integrated albedos. Measurements were 
made at least weekly every 2.5 m along a 200-m survey line from 
April through October. Initially this line was completely snowcovered, 
but as the melt season progressed it became a mixture of bare ice and 
melt ponds. Observed changes in albedo were a combination of a gradual 
evolution due to seasonal transitions and abrupt shifts resulting from 
synoptic weather events. Surface conditions evolved from dry snow (April-May)
to melting snow (June 3) to early melt ponds (mid-late June) to fully developed 
melt ponds (July-Augugust). From June through August albedo measurements 
were made every other day. Albedos integrated from 300 to 3000 nm 
were measured using a Kipp&Zonen albedometer. Spectral albedos from 
300 to 2000 nm were measured using a Spectron Engineering SE-590 
spectroradiometer. Albedos were accurate to within +/- 0.01.