A new scientific study has come out in Nature Magazine and NPR has an article on it today. It is really a treasure trove of all things the Global Warming Cult and especially Al Gore, Do Not want you to know. Please bear with me as I point out a few things.
Morning Edition, March 19, 2009 · A huge chunk of Antarctic ice can’t withstand nonstop global warming, according to a new study published in the latest Nature magazine. And if it melts, the ice will raise the global sea level by 15 or 20 feet — or more.
The only good news here is the catastrophe isn’t likely to unfold quickly.
Didn’t Al Gore just say we had only ten years?
The ice in question is called the West Antarctic ice sheet. In some ways, it’s the planet’s Achilles’ heel. It holds a vast amount of water, locked up as ice, and it’s sitting below sea level, so it’s inherently unstable.
Research On The West Antarctic Ice Sheet
David Pollard at Penn State University says there has been intense research recently to figure out how the ice sheet has behaved over the past 5 million years.
“Before there was only a vague idea of how the West Antarctic ice sheet grew and decayed over those time scales,” he says.
Now, a scientific drilling project has brought back sediment samples taken from underneath the ice sheet, allowing scientists to study the mud layers, like so many tree rings, to show what ice there has done over history.
“It’s really exciting,” Pollard says. “They’ve shown it really has collapsed and re-grown, multiple times.”
You may want to ask just what caused all that collapse and regrowth before the industrial revolution and it’s dreaded C02. And before Humans were even on earth for that matter. The study did go back 5 million years.
Pollard and a colleague have taken that detailed information and asked what it portends for the future of the West Antarctic ice sheet.
“The main reason that it collapsed in the past is the ocean has gotten warmer around the periphery of Antarctica, increasing the rate of melting of these floating ice shelves which fringe West Antarctica,” Pollard says.
Again, without our help.
These floating ice shelves act like buttresses to keep the much larger ice sheet pinned back. And whenever the shelves melt away, the ice behind them flows into the sea and sea levels rise.
Warming ocean water around Antarctica, by a maybe 2 to 5 degrees Celsius, could trigger that chain of events, Pollard says. That degree of ocean warming is not forecast for this century, but at the rate the planet is heating up, it seems inevitable at some point. But Pollard’s study indicates that the West Antarctic ice sheet won’t melt away too rapidly. He figures that will take at least 1,000 years, and more likely 2,000 to 3,000 years.
More likely 2000 to 3000 years? More predictions that are unprovable and will have no effect on anyone. If you can’t adapt in 3000 years to a gradual sea level rise, you should become extinct.
But instead of being reassured by this long time horizon, Pollard says, “I’d say I feel more nervous.”
That’s because there’s now a clear history showing this massive ice sheet has melted before, under conditions that the Earth may soon experience. And while the full effect may not unfold for thousands of years, it would transform the planet into a place we would not recognize today.
That explains what many scientists have been saying all along. The Earth Is Cyclical. It’s kind of like that saying, “Been There, Done That”.
Behavior Of Ice Still Unknown
Stefan Rahmstorf at Postsdam University in Germany says there are still so many unknowns about how Antarctic ice behaves that Pollard’s study is surely not the final word on this subject. Nor does it have to be.
“We certainly don’t need a collapse of the ice sheet to cause major problems with sea level rise,” he says.
Even if Antarctica contributes little or no water to the oceans this century, Rahmstorf says, there’s a growing consensus that seas are likely to rise by at least two or three feet — and quite possibly more — before the end of this century “unless of course we stop the global warming fairly soon.”
Rahmstorf is not involved in the current Antarctica research, but he was at a scientific meeting last week in Copenhagen about rising seas and other aspects of global warming. Rahmstorf says Europe’s global warming policy at the moment is built around a goal to limit global warming to about 4 degrees Fahrenheit.
“Just like we have this temperature limit, we should also have a sea level limit,” he says.
He advocates setting that “sea level limit” at about three feet of sea level rise. Even if that can be accomplished, many vulnerable low-lying places on earth would be swamped, Rahmstorf acknowledges. But it’s hard to imagine doing any better. And, as West Antarctica reminds us, we could easily do much, much worse.
And this whole section starts off with, “Behavior Of Ice Still Unknown”. Well it is unknown to the Global Warming Cult. Or to be more precise, it will not do what they need it to do. But the highlighted sentence is golden.
Rahmstorf is not involved in the current Antarctica research, but he was at a scientific meeting last week in Copenhagen about rising seas and other aspects of global warming but he did stay at a Holiday Inn Express last night.
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