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Posted Sat Feb 27 2010: from
CBC:
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Massive icebergs drift from Antarctic coast http://apocadocs.com/s.pl?1267280484
An iceberg about the size of Luxembourg that struck a glacier off Antarctica and dislodged another massive block of ice could lower the levels of oxygen in the world's oceans, Australian and French scientists said Friday.
The two icebergs are now drifting together about 100 to 150 kilometres off Antarctica following the collision on Feb. 12 or 13, said Australian Antarctic division glaciologist Neal Young.... This area of water had been kept clear because of the glacier, said Steve Rintoul, a leading climate expert. With part of the glacier gone, the area could fill with sea ice, which would disrupt the ability for the dense and cold water to sink.
This sinking water is what spills into ocean basins and feeds the global ocean currents with oxygen, Rintoul explained.
As there are only a few areas in the world where this occurs, a slowing of the process would mean less oxygen supplied into the deep currents that feed the oceans.
"There may be regions of the world's oceans that lose oxygen, and then of course most of the life there will die," said Mario Hoppema, chemical oceanographer at the Alfred Wegener Institute for Polar and Marine Research in Germany.
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[Read more stories about:
arctic meltdown, ecosystem interrelationships]
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