Instrument: Kipp and Zonen albedometer. 
Uncertainty: 0.01 
File format: Files are in the subdirectory TOTALB of the OPTICS directory. 
The filename convention is ALBTmmdd.csv where mm is month and dd is day. 
The file ALBTMay.csv has all the data from May 1998 and the file ALBTsum.csv 
has all the data from June 1998 through September 1998. The first line of the 
file has the date. In subsequent lines the first column is the position along 
the albedo line followed by the albedo for each date. 
Contacts: perovich@crrel.army.mil 

 
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. Total albedos from 
300 to 2000 nm were measured using a Kipp and Zonen albedometer. 
Albedos were accurate to within +/- 0.01.