Southern Ocean polynya, 1974-76 (IMAGE) University of Pennsylvania Caption A polynya, or an opening in the sea ice, was present in the Southern Ocean in the 1970s. This image shows the sea ice concentration averaged over three September months 1974-1976 during the Weddell Polynya, made with data from the NIMBUS-V satellite from the National Snow Ice Data Center. Credit University of Pennsylvania Usage Restrictions In context of reporting License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.