Global Precipitation (IMAGE) University of Washington Caption At the left is observations of average annual precipitation. The right is simulated precipitation with ocean conveyor-belt circulation turned off. Credit D. Frierson, UW Usage Restrictions With credit 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.