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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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Antarctic Temperatures
By Bob B on 1/3/2008 10:22:10 PM , Rating: 3
Rovemelt , I've seen the temperatures from NASA's website (real data) and the vast majority Antarctic has cooled since human measurements began in the 1950s. Only a western peninsula has showed any sign of warming and satellite data shows the ice thickening throughout the continent. Tell us about the Rhode Island size piece of ice, from Al's movie, broke off from the Antarctic. That may be true, but what he does not tell you is that it broke off from area that has cooled since we began measuring temperatures. Peer Review studies don't mean sh*t if the assumptions are incorrect. Since your studies are contrary to the facts, your studies have been adjusted to meet the hypothesis, that is not science.

RE: Antarctic Temperatures
By Andy35W on 1/5/2008 4:15:46 AM , Rating: 2
I seem to recall difference between the Artic and Antartic is that the Antartic is more cut off from the possible effects of manmade climate change due to the circulatory weather patterns that sweep round the lattitudes to the north of it.

Without those it is possible that the Antartic also will be warming up in a similar fashion to the Artic.

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