Greenland ice core dating updating live update

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Crystal structure helps determine age, as well as changes in temperature, snowfall, seasonality, and potential ice movement.

H) that come directly from the water of ancient snows.This drill recovers a core several metres long and 10 cm (4 inches) in diameter.The core hole is kept open with solutions that do not freeze in order to combat the pressure of the ice that would otherwise force the hole closed as progressively deeper cores are extracted.In areas of high accumulation, such as low-latitude mountain glaciers and the Greenland Ice Sheet, annual layers of ice representing tens of thousands of years can be seen and counted, often with the unaided eye.The first deep drilling took place in the 1960s as preliminary efforts at Camp Century, Greenland, and Byrd Station, Antarctica.

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