NOAA 14 AVHRR (Ch1:0.58-0.68 um; Ch2:0.725-1.0um) and ice concentrations as derived with ASI.

The AVHRR sensor is a multi-channel scanning radiometer carried by the NOAA Polar Orbiter satellite series. In the visual channel (channel 2) the high albedo of sea ice gives good contrast to open water which has low albedo. The channel difference Ch1-Ch2 attenuates the effect of cloud coverage.

Thanks to Wolfgang Tonn, Institut für Meteorologie der Freien Universität Berlin , for providing the AVHRR images.