AMOC Proxies (IMAGE) University of Washington Caption These lines show different ways of gauging the strength of the Atlantic overturning circulation. Direct monitoring only began in 2004, so other oceanic measures are needed to extend the dataset back to 1950. Credit Ka-Kit Tung/University of Washington 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.