Ice layer dating
Other than the Sweet Rose Studio blog, you can find me on Facebook, Twitter, Pinterest, and on Instagram at sweetrosestudio. It is not uncommon to read that ice cores from the polar regions contain records of climatic change from the distant past.The amplitude of the annual oscillations slowly decreases relative to other factors, and historic markers are fewer and farther apart.
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Unlike the Greenland ice cores, annual oscillations of ðO and other parameters cannot be traced deeply into the ice sheet on Antarctica.
In Greenland, the high precipitation rates not only provide relatively thick annual layers for analysis, but the accumulating snow quickly seals off the ice beneath and protects the record from metamorphosis by pressure and temperature changes in the atmosphere.
More importantly, we did not consider the average precipitation rate and actual depths of ice for different locations on the Greenland ice sheet.
When these factors are taken into account, the average annual thickness of ice at Camp Century located near the northern tip of Greenland is believed to vary from about fourteen inches near the surface to less than two inches near the bottom (Hammer, et al., 1978).
The Greenland Society of Atlanta has recently attempted to excavate a 10-foot diameter shaft in the Greenland ice pack to remove two B-17 Flying Fortresses and six P-38 Lightning fighters trapped under an estimated 250 feet of ice for almost 50 years (Bloomberg, 1989).