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29-Jun-2020 23:08

Cores are drilled with hand augers (for shallow holes) or powered drills; they can reach depths of over two miles (3.2 km), and contain ice up to 800,000 years old.The physical properties of the ice and of material trapped in it can be used to reconstruct the climate over the age range of the core.Hand augers can be rotated by a T handle or a brace handle, and some can be attached to handheld electric drills to power the rotation.With the aid of a tripod for lowering and raising the auger, cores up to 50 m deep can be retrieved, but the practical limit is about 30 m for engine-powered augers, and less for hand augers.In Greenland, a sequence of collaborative projects began in the 1970s with the Greenland Ice Sheet Project; there have been multiple follow-up projects, with the most recent, the East Greenland Ice-Core Project, expected to complete a deep core in east Greenland in 2020.Because the rate of snowfall varies from site to site, the age of the firn when it turns to ice varies a great deal.

When the sun approaches its lowest point in the sky, the temperature drops and hoar frost forms on the top layer.

The bubbles disappear and the ice becomes more transparent.



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