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Earth orbit changes were key to Antarctic warming that ended last ice age
Last edited Thu Aug 15, 2013, 03:10 PM - Edit history (1)
http://www.washington.edu/news/2013/08/14/earth-orbit-changes-were-key-to-antarctic-warming-that-ended-last-ice-age/[font face=Serif]August 14, 2013
[font size=5]Earth orbit changes were key to Antarctic warming that ended last ice age[/font]
Vince Stricherz
News and Information
[font size=3]For more than a century scientists have known that Earth’s ice ages are caused by the wobbling of the planet’s orbit, which changes its orientation to the sun and affects the amount of sunlight reaching higher latitudes, particularly the polar regions.
The Northern Hemisphere’s last ice age ended about 20,000 years ago, and most evidence has indicated that the ice age in the Southern Hemisphere ended about 2,000 years later, suggesting that the south was responding to warming in the north.
But new research published online Aug. 14 in Nature shows that Antarctic warming began at least two, and perhaps four, millennia earlier than previously thought.
Most previous evidence for Antarctic climate change has come from ice cores drilled in East Antarctica, the highest and coldest part of the continent. However, a U.S.-led research team studying a new ice core from West Antarctica found that warming there was well under way 20,000 years ago.
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http://dx.doi.org/10.1038/nature12376[font size=5]Earth orbit changes were key to Antarctic warming that ended last ice age[/font]
Vince Stricherz
News and Information
[font size=3]For more than a century scientists have known that Earth’s ice ages are caused by the wobbling of the planet’s orbit, which changes its orientation to the sun and affects the amount of sunlight reaching higher latitudes, particularly the polar regions.
The Northern Hemisphere’s last ice age ended about 20,000 years ago, and most evidence has indicated that the ice age in the Southern Hemisphere ended about 2,000 years later, suggesting that the south was responding to warming in the north.
But new research published online Aug. 14 in Nature shows that Antarctic warming began at least two, and perhaps four, millennia earlier than previously thought.
Most previous evidence for Antarctic climate change has come from ice cores drilled in East Antarctica, the highest and coldest part of the continent. However, a U.S.-led research team studying a new ice core from West Antarctica found that warming there was well under way 20,000 years ago.
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