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method had been worked out back in 1954 by an ingenious Danish scientist, Willi Dansgaard. He showed that the ratio of oxygen isotopes (O18/O16) in the ice measured the temperature of the clouds at the time the snow had fallen — the warmer the air, the more of the heavy isotope got into the ice crystals. It was an exhilarating day for the researchers at Camp Century, making measurements along each cylinder of ice after it was pulled up from the borehole, when they saw the isotope ratios change and realized they had reached the last ice age. The preliminary study of the ice cores, published in 1969, showed variations that indicated an The hottest see you in valhalla viking all over printed air jordan 13 sneakersaverage temperature change of perhaps 10°C (that is, 18°F). Some cycles were tentatively identified, including one with a 13,000 year length. Comparison of the Greenland and Antarctic cores showed that the climate changes were truly global, coming at essentially the same time in both hemispheres. That put a strict constraint on theories about the cause of cycles. The problem that researchers set themselves was to find a pattern in the timing of the changes. Unfortunately, there were no tools to accurately determine dates so far in the past; any figure might be wrong by thousands of years.

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