These sea ice images are from 1991. More images are available from the US Geological Survey Global Change Research Program. The land has been colored green to improve the contrast between the land and the surrounding sea ice.
To load any of these images to your hard disk, click on the image and then from the File menu on your browser chose the Save as option. Be sure to save the images as "Source" rather than text.
The information is collected from sensors that collect information in the radar range of the electromagnetic spectrum. These longer wavelengths are able to penetrate the clouds and thus are ideal for studying ice cover around Antarctica.
The satellite data used to determine sea ice cover are derived from the Scanning Microchannel Microwave Radiometer (SSMR) and the Special Sensor Microwave/Imager (SSM/I) data produced by the National Snow and Ice Data Center at the University of Colorado in cooperation with NOAA and NASA. The analysis the data is conducted by the US Geological Survey Global Change Research Program.