World’s Oceans May Not Be Able to Absorb Carbon Dioxide Released by Global Warming

Images Climate scientists have been looking at ways the Earth might benefit from natural processes to balance the rising heat. One process had intrigued them above all others: that melting ice at the poles might allow more open water that could absorb carbon dioxide, one of the major compounds implicating in warming.

But new research just published in the journal Science and led by a University of Georgia biogeochemist, says that idea may be a dead end. In fact, a survey of waters in the Canada Basin, which extends north of Alaska to the North Pole, shows that its value as a potential carbon dioxide "sink" may be short-lived at best and minor in terms of what the planet will need to avoid future problems.

"The Canada Basin and entire Arctic Ocean are still taking up carbon dioxide," said Wei-Jun Cai, a professor in the department of marine biology in UGA's Franklin College of Arts and Sciences and lead author of the study. "But our research shows that as the ice melts, the carbon dioxide in the water very quickly reaches equilibrium with the atmosphere, so its use as a place to store CO2 declines dramatically and quickly. We never really understood how limited these waters would be in terms of their usefulness in soaking up carbon dioxide."

The carbon dioxide level in the Earth's atmosphere has increased dramatically since the industrial revolution, and around 30 percent of that CO2 has been absorbedby the oceans. That has been the good news. The bad news is that it increases the acidification of the seas, causing changes in conditions for the growth of all life forms.

Melting in the planet's Arctic zone has been dramatic in the past three years. A recent paper predicted that the Arctic Ocean would be ice-free during summer within 30 years, Cai noted. Researchers in years past had predicted that increased areas of open water in the Arctic, while troublesome in many ways, might at least sequester increasing amounts of carbon dioxide because of summertime ice melts.

"This prediction, however, was made based on observations of very low surface water carbon dioxide levels," said Cai, "from either highly productive ocean margin areas or basin areas under earlier ice-covered conditions before the recent major ice retreat."

To see just how efficient Canada Basin waters would be in taking up atmospheric carbon dioxide, an international team of scientists in the summer of 2008 boarded the retrofitted Chinese research vessel Xue Long (Snow Dragon) for a three-month research voyage. Using direct sampling of water and another method called "underway" sampling, in which water is pumped into the ship directly from the ocean, analyzed and returned, they studied the upper layers of the water into which they sailed. They also studied the waters' salinity, temperature, nutrient concentration and chlorophyll activity.

What Cai and colleagues found was that as greater areas of ice melt each summer, the Canada Basin's potential as a CO2 sink will diminish dramatically mainly because of the rapid uptake of CO2 from the atmosphere. And because of this carbon dioxide uptake, the waters become quite acidic and "a poor environment for calcium-carbonate shell-bearing marine organisms," Cai said.

The findings are at once intriguing and disappointing because carbon dioxide and other gases dissolve more readily in cold water than warm water, and so scientists had long thought that seas of melting polar ice would at least have the trade-off of being good places for the absorption of carbon dioxide.

The research was a joint project with the government of China. Collaborative work of this kind between the governments of the United States and China on Arctic research is relatively new. Cai said it greatly benefits both parties.

"One of the take-away lessons of this research is that we can't expect the oceans to do the job of helping offset global warming in the short term," said Cai.

Jason McManus via University of Georgia

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