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Global warming may not be the culprit after all when it comes to Artic changes

Climate data can be difficult to analyze. Take for instance global temperature changes. Whereas the Northern Hemisphere has been warming, the Southern half of the planet is cooling. While Antarctic Ice is at near-record levels, the Northern Pole is warming at an unprecedented pace-- much faster than global warming models predict.

A new study published in the journal Nature identified a possible cause for this discrepancy. It identifies a natural, cyclical flow of atmospheric energy around the Arctic Circle. A team of researchers, led by Rune Graversen of Stockholm University, conclude this energy flow may be responsible for the majority of recent Arctic warming.

The study specifically rules out global warming or albedo changes from snow and ice loss as the cause, due to the "vertical structure" of the warming ... the observed warming has been much too weak near the ground, and too high in the stratosphere and upper troposphere.

This study follows hot on the heels of research by NASA, which identified "unusual winds" for rapid Arctic ice retreat. The wind patterns, set up by atmospheric conditions from the Arctic Oscillation, began rapidly pushing ice into the Transpolar Drift Stream, a current which quickly sped the ice into warmer waters.

A second NASA team, using data from the the GRACE (Gravity Recovery and Climate Experiment) satellite, recently concluded that changes in the Arctic Oscillation were "mostly decadal in nature", rather than driven by global warming.



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Isn't the real issue here
By Akazar on 1/4/2008 12:23:14 PM , Rating: 2
to our environment, not the warming of the globe or climate change.

But the increase in sea levels across the world. Rising C02 levels has increased the water levels. And that's really the problem isn't it.




RE: Isn't the real issue here
By masher2 (blog) on 1/4/2008 12:29:50 PM , Rating: 2
Sea levels have been steadily rising for at least the past 7,000 years, since the planet exited the last ice age. The IPCC predicts a rise of 23 cm over the next 100 years, a rate of change which is neither unusual nor alarming.


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