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Six deep ice cores and one sediment core now provide a clear and continuous record of Earth's history.
"We started this ice core project in 2005," says manager Mark Twickler.
With support from the National Science Foundation (NSF), Twickler and a team of scientists, engineers and support personnel traveled to the bottom of the world to drill and bring back these ice cores, which are perfectly preserved records of the distant past.
"I'm here to cut gas samples out of this core," says Murat Aydin, a chemist who's visiting from the University of California, Irvine.
"I'm looking at the mineralogy of the ice," says Donald Voigt, a geoscientist from Penn State.
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They can check for telltale markers, such as volcanic ash signatures.
The Krakatoa eruption of 1883 and the Vesuvius eruption that wiped out Pompeii and Herculaneum in AD 79 left their specific marks in exactly the annual layers anticipated. As it turns out, these cycles-caused by regular variations in the eccentricity or ellipticity of Earth's orbit (period = 100,000 years) and the tilt of Earth's orbit (period = 41,000 years)-correspond perfectly with what's seen in those core layers.
For the visible strata (and, we believe, for any other annual indicator at accumulation rates representative of central Greenland), it is almost certain that variability exists at the subseasonal or storm level, at the annual level, and for various longer periodicities (2-year, sunspot, etc.).
We certainly must entertain the possibility of misidentifying the deposit of a large storm or a snow dune as an entire year or missing a weak indication of a summer and thus picking a 2-year interval as 1 year.”It was in this area, 17 miles off the east coast of Greenland, that Bob Cardin and other members of his squadron had to ditch their six P-38’s and two B-17’s when they ran out of gas in 1942 - the height of WWII.
It's minus 23.3 degrees Celsius (minus 10 degrees Fahrenheit) inside, so everyone is bundled up in ski parkas, insulated gloves and boots.Tags: Adult Dating, affair dating, sex dating