|Data Details||FTP Site||Validation Info||Problems|
This data set consists of AVHRR retrievals of surface and cloud properties as well as radiative fluxes during the SHEBA (Surface HEat Budget of the Arctic Ocean) experiment. The data set covers the entire Arctic, twice daily, for 1997 and 1998. A 5 km data set covering the western Arctic is also available.
SHEBA is a multiagency experiment that took place from the fall of 1997 through the fall of 1998. During that period a Canadian icebreaker frozen into an ice floe was used as a base for scientific studies of the ocean, ice, and atmosphere. Research aircraft from the U.S. (NCAR C-130, NASA ER-2, and UW Convair) and Canada (Candian Convair) also took part in the experiment during the spring and summer of 1998.
Cloud and surface properties were estimated from AVHRR data for the
SHEBA year. Five kilometer data from the AVHRR
Polar Pathfinder project were used in the analyses, subsampled to
25 km. All images are
centered on 04:00 (low sun) and 14:00 (high sun) local solar times,
though the pixels within
any given image may have been acquired 1-3 hours before or after those
The retrieval algorithms of the Cloud and Surface Parameter Retrieval
system were applied. The following parameters are available:
|Surface and Clouds:||Radiation:|
Here are two examples of the data set. The top image shows the all-sky broadband surface albedo over the Arctic for the month of June 1997 at 1400 local solar time. The second image shows the monthly average downwelling longwave flux at the surface for the same month. The images have been remapped to a polar stereographic projection.