Unless man-made carbon dioxide (CO2) emissions are substantially curbed,
or atmospheric CO2 is controlled by some other means, the ocean will
continue to become more acidic, according to a new National Research Council report requested by the US Congress.
The long-term consequences of ocean acidification on marine life are unknown, but many ecosystem changes are expected to result.
The ocean absorbs approximately a third of man-made CO2 emissions, including those from fossil-fuel use, cement production, and deforestation. The CO2 taken up by the ocean decreases the pH of the water and leads to a combination of chemical changes collectively known as ocean acidification.
Since the beginning of the industrial revolution, the average pH of ocean surface waters has decreased approximately 0.1 unit–from about 8.2 to 8.1–making them more acidic. Models project an additional 0.2 to 0.3 drop by the end of the century. This rate of change exceeds any known to have occurred in hundreds of thousands of years, the report says.
Studies on a number of marine organisms have shown that lowering seawater pH with CO2 affects biological processes, such as photosynthesis, nutrient acquisition, growth, reproduction, and individual survival depending upon the amount of acidification and the species tested. For example, some of the strongest evidence of the potential effects of ocean acidification on marine ecosystems comes from experiments on organisms with calcium carbonate shells and skeletons. The results showed decreases in shell and skeletal growth in a range of marine organisms, including reef-building corals, commercially important mollusks such as oysters and mussels, and several types of plankton at the base of marine food webs.
The ability of various marine organisms to acclimate or adapt to ocean acidification is unknown, but existing data suggest that there will be ecological winners and losers, leading to shifts in the composition and functioning of many marine ecosystems, the committee said. Such ecosystem changes could threaten coral reefs, fisheries, protected species, and other natural resources.
Although changes in ocean chemistry caused by increasing atmospheric CO2 can be determined, not enough information exists to assess the social or economic effects of ocean acidification, much less develop plans to mitigate or adapt to them, the NRC committee noted.
The federal government has taken initial steps to respond to the nation’s long-term needs with the development of the National Ocean Acidification Program.
The committee recommended six key elements of a successful National Ocean Acidification Program:
- an integrated ocean acidification observation network that includes the development of new tools, methods, and techniques to improve measurements
- research in eight broad areas to fulfill critical information gaps
- assessments to identify stakeholder concerns and a process to provide relevant information for decision support
- a data management office that would ensure data quality, access, and archiving, plus an information exchange that would provide research results, syntheses, and assessments to managers, policymakers, and the general public
- facilities to support high-quality research and training of ocean acidification researchers
- an effective 10-year strategic plan for the program that will identify key goals, set priorities, and allow for community input, in addition to a detailed implementation plan
A summary of the report is available at the link below.
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