In FY12-14 we will purchase and deploy O2 and pH sensors built by Aanderaa Data Instruments. These sensors will be deployed as an add-on component to the other planned Alaska field projects (i.e. each field project in Alaska will have access to and be expected to collect pH and O2 data during their study). In addition, units will be purchased to deploy on bottom trawl surveys of the Gulf of Alaska (FY13) and Aleutian Islands (FY12 and FY14). This will allow a region-wide collection of data during the summer months hopefully collecting up to 800 deployments of pH and O2 data per year from Dixon Entrance in SE Alaska to Stalemate Bank in the far-western Aleutian Islands. These data will be incorporated into the Coral and Sponge Distribution Model Validation Fieldwork conducted in FY12-14 and will be compared to information on coral and sponge health collected in the Gulf of Alaska HAPC Study. In addition, the sensors will continue to be deployed on the bottom trawl surveys after the conclusion of the Alaska Region Fieldwork Initiative (FY15 and beyond) and will be integrated into the time series of environmental data available from these surveys.