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Climate change will affect carbon sequestration in oceans, model shows

An Earth System model developed by researchers at the University of Illinois at Urbana-Champaign indicates that the best location to store carbon dioxide in the deep ocean will change with climate change.

The direct injection of carbon dioxide deep into the ocean has been suggested as one method to help control rising carbon dioxide levels in the atmosphere and mitigate the effects of global warming. But, because the atmosphere interacts with the oceans, the net uptake of carbon dioxide and the oceans' sequestration capacity could be affected by climate change.

"Through a number of physical and chemical interactive mechanisms, the ocean circulation could change and affect the retention time of carbon dioxide injected into the deep ocean, thereby indirectly altering oceanic carbon storage and atmospheric carbon dioxide concentration," said Atul Jain, a professor of atmospheric sciences. "Where the carbon dioxide is injected turns out to be a very important issue."

Developed by Jain and graduate student Long Cao, the Integrated Science Assessment Model is a coupled climate-ocean-terrestrial biosphere-carbon cycle model that allows extensive exploration of key physical and chemical interactions among individual components of the Earth system, as well as among carbon cycle, climate change and ocean circulation.

"A good understanding of climate change, ocean circulation, the ocean carbon cycle and feedback mechanisms is crucial for a reliable projection of atmospheric carbon dioxide concentration and resultant climate change," Jain said. The model is described in the September issue of the Journal of Geophysical Research -- Oceans.

Using the model, Jain and Cao studied the effectiveness of oceanic carbon sequestration by the direct injection of carbon dioxide at different locations and depths.

They found that climate change has a big impact on the oceans' ability to store carbon dioxide. The effect was most pronounced in the
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Source:University of Illinois at Urbana-Champaign


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