Godlike Productions - News: Former Global Warming skeptic now claims major sea ice melt this Summer

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Wednesday, May 14, 2008

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Former Global Warming skeptic now claims major sea ice melt this Summer

The Associated Press

2008-05-04

WASHINGTON (AP) — The Arctic will remain on thinning ice, and climate warming is expected to begin affecting the Antarctic also, scientists said Friday.

"The long-term prognosis is not very optimistic," atmospheric scientist Jennifer Francis of Rutgers University said at a briefing.

Last summer sea ice in the North shrank to a record low, a change many attribute to global warming.

But while solar radiation and amounts of greenhouse gases in the atmosphere are similar at the poles, to date the regions have responded differently, with little change in the South, explained oceanographer James Overland of the National Oceanic and Atmospheric Administration.

What researchers have concluded was happening, was that in the North, global warming and natural variability of climate were reinforcing one another, sending the Arctic into a new state with much less sea ice than in the past.

"And there is very little chance for the climate to return to the conditions of 20 years ago," he added.

On the other hand, Overland explained, the ozone hole in the Antarctic masked conditions there, keeping temperatures low in most of the continent other than the peninsula reaching toward South America.

"So there is a scientific reason for why we're not seeing large changes in the Antarctic like we're seeing in the Arctic," he said.

But, Overland added, as the ozone hole recovers in coming years, global warming will begin to affect the South Pole also.

The briefing covered data being reported in a paper scheduled for publication next week in Eos, a journal of the American Geophysical Union.

Overland said he used to be among those skeptical about the effects of global climate change. The new findings, which he termed "startling," were developed at a recent workshop, he said.

There is agreement between weather observations, the output of computer climate models and scientific expectations for what should happen, added Francis.

All the evidence points toward human-made changes at both poles, she said, a conclusion that "further depletes the arsenals of those who insist that human-caused climate change is nothing to worry about."

Climatologist Gareth Marshall of the British Antarctic Survey said that while the term global warming is widely used, things are more complicated at the regional level.

In the Antarctic, he explained, climate change strengthened winds blowing around the continent, helping trap colder air. But that will decrease in the future, allowing warmer conditions to begin, he said.

And, Marshall added, all studies now show that human activities are the drivers of climate change in the Antarctic.

Asked if this summer will match last year's record low sea ice in the North, Overland that is likely.

"The tea leaves point to a minimal amount of sea ice next September, that would be the same as we had last summer, 40 percent loss compared to 20 years ago," he said. Overland added that the winter freeze got a late start last fall.

Francis added: "Over this entire fall, winter and right up 'till today the ice concentration, the amount of ice that's floating around on the Arctic, has been below normal every single day."

"All arrows are pointing towards, certainly not a recovery, something like we had last summer and possibly worse," she said.

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