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It is not uncommon to read that ice cores from the polar regions contain records of climatic change from the distant past.Research teams from the United States, the Soviet Union, Denmark, and France have bored holes over a mile deep into the ice near the poles and removed samples for analysis in their laboratories.However, such estimates are critically based on the assumption that the accumulation rate has not varied greatly over the past.Unlike the Greenland ice cores, annual oscillations of ðO and other parameters cannot be traced deeply into the ice sheet on Antarctica.We would expect considerably higher precipitation rates immediately following the Flood. The layers of ice near the bottom of the core should be thicker than expected by the uniformitarian model and contain unusual excursions in ðO, acidity, and particulates from levels higher in the core. The Greenland ice sheet averages almost 4000 feet thick.If we were to assume the ice sheet has been accumulating at this rate since its beginning, it would take less than 1000 years for it to form and the recent-creation model might seem to be vindicated. In making our calculations, we did not take into account the compaction of the snow into ice as it is weighted down by the snow above.
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).
Once the accumulation rate is calculated for each layer, the depth and age for each layer in the ice is calculated by integrating the annual accumulation downward from the surface.
There are several historical markers in Antarctica which can be used to cross check these calculations for the past few thousand years.
This is in relatively good agreement with the number of annual oscillations of O currently observed in Greenland cores.
Although occasional ambiguities occur, it is relatively easy to count annual layers downward from the surface through considerable depths in the Greenland ice sheet.The technique used to estimate the age of an ice layer deep in the ice sheet is to measure its ðcontent and compute the atmospheric temperature which is observed to produce such concentrations today (Jouzel and Merlivat, 1984).