Acidification

Oceans Passing Critical CO2 Threshold

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UXBRIDGE, Canada – An apparent rapid upswing in ocean acidity in recent years is wiping out coastal species like mussels, a new study has found.


Coral at the Great Barrier Reef. Rising carbon dioxide levels in the world’s oceans due to climate change, combined with rising sea temperatures, could accelerate coral bleaching, destroying some reefs before 2050, said an Australian study in January 2002. (Reuters)

“We’re seeing dramatic changes,” said Timothy Wootton of the Department of Ecology and Evolution at the University of Chicago, lead author of the study published Monday in the Proceedings of the National Academy of Sciences. The study shows increases in ocean acidity that are more than 10 times faster than any prediction.

“It appears that we’ve crossed a threshold where the ocean can no longer buffer the effects of CO2 in the atmosphere,” Wootton told IPS.

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Are the oceans giving up?

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Studies seem to indicate that oceans, which are major carbon sinks, may have had enough. If so, the consequences are BAD, writes Jayalakshmi K.

Ocean deserts, which are non-productive areas, have increased by 15 per cent in the period 1998-2007, according to a study done by the National Oceanic and Atmospheric Administration (NOAA) in the US and the University of Hawaii. This translates into a total of 6.6 million sq km. On the whole, there are 51 million sq km of such desert zones. The data was collected by Nasa’s orbiting SeaStar craft.

Attributed mostly to warming surface waters, which is happening at a rate of 1 per cent every year, this creates many layers in the ocean waters, preventing deep ocean nutrients from rising to the surface and feeding plant life.

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