OA1 was deployed near Monterey, CA in April 2011 to study ocean acidification (OA), it was removed in November 2011 and was later redeployed the same months in 2012 and 2013. A variety of sensors provide water temperature, salinity, pH, CO2, dissolved oxygen and meteorological data. The mooring is located at 36.62288 N, -121.9 W. For more information on this data contact Francisco Chavez of MBARI.