Under lead author Andrea J. Fassbender, researchers studied the transportation of subsurface waters containing high carbon dioxide levels in the California Current System to the surface of the ocean near shorelines. Specifically, they studied an event of upwelling near coastal northern California. As the water traveled toward shore, subsurface respiration added dissolved inorganic carbon along its path, making the water undersaturated in terms of Aragonite. In the mixed layer, levels of pCO(2) decreased due to the addition of DIC, addition of alkalinity, and gas exchange. The contribution of each process depended on the distance of the area from land. According analysis of the results, when waters arrive at the surface of the ocean gas exchange and biological productivity reduce ocean acidification over time, but respiration processes along the path followed by the upwelling tend to increase the acidification of the upwelling waters.
Continental Shelf Research 31, 1180-1192 (2011)