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New discovery of how carbon is stored in the Southern Ocean
Date:7/30/2012

A team of British and Australian scientists has discovered how carbon is drawn down from the surface of the Southern Ocean to the deep waters beneath.

The Southern Ocean is an important carbon sink in the world around 40 per cent of the annual global CO2 emissions absorbed by the world's oceans enter through this region.

Reporting this week in the journal Nature Geoscience, scientists from British Antarctic Survey (BAS) and Australia's national research agency, the Commonwealth Scientific and Industrial Research Organisation (CSIRO), reveal that rather than carbon being absorbed uniformly into the deep ocean in vast areas, it is drawn down and locked away from the atmosphere by plunging currents a thousand kilometres wide.

Winds, currents and massive whirlpools that carry warm and cold water around the ocean known as eddies create localised pathways or funnels for carbon to be stored.

Lead author, Dr Jean-Baptiste Salle from British Antarctic Survey says, "The Southern Ocean is a large window by which the atmosphere connects to the interior of the ocean below. Until now we didn't know exactly the physical processes of how carbon ends up being stored deep in the ocean. It's the combination of winds, currents and eddies that create these carbon-capturing pathways drawing waters down into the deep ocean from the ocean surface."

"Now that we have an improved understanding of the mechanisms for carbon draw-down we are better placed to understand the effects of changing climate and future carbon absorption by the ocean."

CSIRO co-author, Dr Richard Matear says the rate-limiting step in the anthropogenic carbon uptake by the ocean is the physical transport from the surface into the ocean interior.

"Our study identifies these pathways for the first time and this matches well with observationallyderived estimates of carbon storage in the ocean interior," Dr Matear says.

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Contact: Craig Macaulay
Craig.Macaulay@csiro.au
61-362-325-219
CSIRO Australia
Source:Eurekalert

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