In Situ Ocean Acidification Environmental Observations: MBARI´s Cabled Observatory Technology for Controlled Studies of Changing Ocean pH

This poster explores modifications to the design, fabrication and implementation of the field tested prototype Free Ocean CO₂ Enrichment (FOCE) system. The proof of concept prototype system was able in the field to control pH perturbations from acid release simulating CO₂ induced pH changes in specific habitat experiments. The acidified flow was pumped so as to maintain a constant delta pH under varying environmental conditions. The modified FOCE system concept is to be powered and supplied by a cable and pipe system from shore, and to move towards CO₂-rich water rather than acid releases. Discussion of the FOCE test results to date indicates paths to improved performance, with a primary problem being system design to accommodate the slow kinetics of the CO₂ hydration reaction in sea water. This paper discloses current MBARI science and engineering efforts and concepts towards an ocean observing system solution by integrating the chemical kinematics of the CO₂ -water reaction and the next step in FOCE development for in situ science.