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Qtec
11-25-2005, 01:00 AM
Record ice core reveals Earth's ancient atmosphere
19:00 24 November 2005
NewScientist.com news service
David L Chandler

The longest ice-core record of climate history ever obtained has hugely extended the detailed history of Earth's atmosphere, and shows that levels of greenhouse gases really do march in lockstep with changes in temperature.

The frozen record of the Earth's atmosphere is 3270 metres long and covers the last 650,000 years – 50% longer than before. It was obtained from the tiny air bubbles trapped in a deep ice core from Antarctica.

The tight coupling between temperatures and the greenhouse gas levels revealed by the core matches the predictions from climate models used to forecast future global warming. It also bears some good news: the warm interglacial periods between ice ages can last a long time, contrary to the view that we may already be due for the onset of the next ice age.

The European Project for Ice Coring in Antarctica (EPICA) team has spent years drilling the ice core in Antarctica's Ice Dome Concordia. They had previously analysed its record of global temperatures, but have just completed the detailed analysis of the trapped air. The bubbles record how the planet’s atmosphere changed over six ice ages and the warmer periods in between. But during all that time, the atmosphere has never had anywhere near the levels of greenhouse gases seen today.

Today's level of 380 parts per million of carbon dioxide is 27% above its previous peaks of about 300 ppm, according to the team led by Thomas Stocker of the University of Bern in Switzerland.



Its getting warm.

Q.....what about Ogle?