Estimating visible and near-infrared sea ice albedo from the AVHRR observations.
The visible and near-infrared sea ice albedos were derived from the AVHRR Polar Pathfinder observations using the neural networks (NN), which approximated the atmosphere radiation transfer model STREAMER (DISORT algorithm, 30 streams) (Key, 2001). Neural network inputs were visible/near-infrared top of atmosphere reflectances, sun zenith angle, satellite elevation and view angles, precipitable water amount from the AVHRR Polar Pathfinder, and the monthly mean aerosol optical depth from the CASPR (Key, 2002). Comparison of the AVHRR-derived clear sky sea ice visible and near-infrared albedos with SHEBA measurements gives mean differences of -0.11% and 3.07%, srespectively, and SD of difference of 5.19% and 1.78%.
Key J. (2001), Streamer User's Guide, Cooperative Institute for Meteorological Satellite Studies, University of Wisconsin, 96 pp.
Key J. (2002), The Cloud and Surface Parameter Retrieval (CASPR) System for Polar AVHRR User's Guide, Cooperative Institute for Meteorological Satellite Studies, University of Wisconsin, 61 pp.