Global overturning circulation (IMAGE) Hokkaido University Caption Sinking of sea water occurs in a large scale in the North Atlantic and along the Antarctic coast, where large amounts of sea ice are produced, causing a global overturning circulation. (Modified from NOAA/NASA) Credit Modified from NOAA/NASA Usage Restrictions This image is copyrighted but may be used to cover this Feature Story if credited to the creator. License Original 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.