Sea Ice (IMAGE) Brown University Caption Local tidal currents strongly affect the movement of sea ice in the Arctic ocean and the makeup of the seafloor causes some of the most abrupt changes. Credit Daniel Watkins. Usage Restrictions Credit must be given to the creator. License CC BY 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.