Thursday, November 1, 2007

Ill logic

Bought one of the twin tween turnettes a book on logic last week.

Apparently it might be a good recommendation for some publishing scientists.
Melting Glacier Reveals Ancient Tree Stumps

By LiveScience Staff
posted: 30 October 2007 01:50 pm ET

Melting glaciers in Western Canada are revealing tree stumps up to 7,000 years old where the region's rivers of ice have retreated to a historic minimum, a geologist said today.

Johannes Koch of The College of Wooster in Ohio found the fresh-looking, intact tree stumps beside retreating glaciers in Garibaldi Provincial Park, about 40 miles (60 kilometers) north of Vancouver, British Columbia.

Radiocarbon dating of the wood from the stumps revealed the wood was far from fresh—some of it dated back to within a few thousand years of the end of the last ice age.

"The stumps were in very good condition, sometimes with bark preserved," said Koch, who conducted the work as part of his doctoral thesis at Simon Fraser University in Burnaby, British Columbia. Koch will present his results on Oct. 31 at the Geological Society of America annual meeting in Denver.

The pristine condition of the wood, he said, can best be explained by the stumps having spent all of the last seven millennia under tens to hundreds of meters of ice. All stumps were still rooted to their original soil and location.

"Thus they really indicate when the glaciers overrode them, and their kill date gives the age of the glacier advance," Koch said. The age of the newly revealed ancient trees also indicates how long the glaciers have covered this region.

The recently warming climate released the stumps from their icy tombs, Koch said.

Koch compared the kill dates of the trees in the southern and northern Coast Mountains of British Columbia and those in the mid- and southern Rocky Mountains in Canada to similar records from the Yukon Territory, the European Alps, New Zealand and South America. He also looked at the age of Oetzi, the prehistoric mummified alpine "Iceman" found at Niederjoch Glacier, and similarly well-preserved wood from glaciers and snowfields in Scandinavia.

The radiocarbon dates seem to be the same around the world, according to Koch. There have been many advances and retreats of these glaciers over the past 7,000 years, but no retreats that have pushed them back so far upstream as to expose these trees.

The age of the tree stumps gives new emphasis to the well-documented before-and-after photographs of retreating glaciers during the past 100 years.

"It seems like an unprecedented change in a short amount of time," Koch said. "From this work and many other studies looking at forcings of the climate system, one has to turn away from natural ones alone to explain this dramatic change of the past 150 years."
Let's review, shall we?

Trees will only grow in regions that have at least 90 days of 500 weather. They also need a fair depth of soil which can only come about by many, many years of the laying down of organic matter.

The previous ice age ended about 15,000 years ago. The glaciation retreated northward and has ebbed and flowed within a latitudinal range ever since. Trees and other biota are being revealed with some consistent dating of about 5000 BCE as the ice retreats.

So it was naturally warmer 7000 years ago and there's no good evidence that it's not naturally warmer now.

But grants to institutes and salaries of researchers mesh very well indeed with some political and social agendas.

Update and pertinent addendum

Read Twisted Science Bullies of the Beltway
by Michael R. Fox, Ph.D.


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