Carbon dioxide and ocean pH

Atmospheric CO2 and ocean pH

Observations of CO2 (parts per million) in the atmosphere and pH of surface seawater from Mauna Loa and Hawaii Ocean Time-series (HOT) Station Aloha, Hawaii, North Pacific.

Credit: Adapted from Richard Feely (NOAA), Pieter Tans, NOAA/ESRL ( and Ralph Keeling, Scripps Institution of Oceanography (