Unusually high concentrations of carbon dioxide have been blowing out to sea from Bay Area cities and agricultural areas, raising concerns that the previously unknown infusions could increase ocean acidity faster than climate change experts have predicted, Monterey Bay scientists said this week. The greenhouse gases flowing into the sea could add as much as 25 million tons of carbon dioxide into the ocean every year, roughly 1 percent of the total annual amount from all sources that permeates the sea water, according to calculations by the Monterey Bay Aquarium Research Institute.