Acidity Observations (IMAGE) University of Washington Caption Open-ocean pH, on the left, is fairly stable but gradually dropping due to climate change. The pH in Puget Sound, right, is more variable, but is fed by the open-ocean water. The right shows three different depths. Credit NOAA IOOS 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.