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When this turns to ice, the two layers will make up no more than a foot of ice. Thus each annual layer starts 10Be and 36Cl poor, becomes 10Be and 36Cl rich, and then becomes poor again. It has already been seen that the delta value is related to air temperature when the snow was deposited.
How are samples acquired without destroying the ice? The CO 2 can be isolated by subliming the ice in a vacuum, keeping the temperature low enough to avoid the loess giving up any carbon. A more reliable method of detecting volcanic eruptions from the ice cores however, is to measure sulphate directly.
Therefore, the actual length of geologic time represented by any given layer is usually unknown or, at best, a matter of opinion. Using Pre-Determined Ages as Markers 1.
The Laschamp eventa geomagnetic reversal about 40, years ago, can be identified in cores;   away from that point, measurements of gases such as CH 4 methane can be used to connect the chronology of a Greenland core for example with an Antarctic core. Early thermal drills, designed for use without drilling fluid, were limited in depth as a result; later versions were modified to work in fluid-filled holes but this slowed down trip times, and these drills retained the problems of the earlier models.
Ice Core Dating
EM drills are also more likely to fracture ice cores where the ice is under high stress. The layers corresponding to the summer snow will contain bigger bubbles than the winter layers, so the alternating layers remain visible, which makes it possible to count down a core and determine the age of each layer.
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Carbon dioxide and methane are greenhouse gases and the similarity between the graphs for their concentrations and the temperature change graph indicates that the greenhouse effect is real and that it has been around for many thousands of years.
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