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The ACFEL ice auger showing an ice core pushed up into the core remover barrel. [1]Ice drilling allows scientists studying glaciers and ice sheets to gain access to what is beneath the ice, to take measurements along the interior of the ice, and to retrieve samples.
Ice core sample taken from drill. An ice core is a core sample that is typically removed from an ice sheet or a high mountain glacier.Since the ice forms from the incremental buildup of annual layers of snow, lower layers are older than upper ones, and an ice core contains ice formed over a range of years.
Sea ice was 2 m (6.6 ft) thick with a water depth of 150–300 m (490–980 ft) below. Four overlapping drill cores at three sites reflect in excellent quality the geological history and glaciation of the Antarctic during the last 34 million years.
The drilling site of the North Greenland Ice Core Project (NGRIP or NorthGRIP) is near the center of Greenland (75.1 N, 42.32 W, 2917 m, ice thickness 3085). Drilling began in 1999 and was completed at bedrock in 2003. [1] The cores are cylinders of ice
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The ice core samples taken from the base are still cited in research, according to William Colgan, a climate and glacier scientist at York University in Toronto, Canada, and a research associate ...
In February 2012, Russian ice-core drilling at Lake Vostok accessed the subglacial lake for the first time. [32] Lake water flooded the borehole and froze during the winter season, and the sample of re-frozen lake water (accretion ice) was recovered in the following summer season of 2013.
The core goes back 740,000 years and reveals 8 previous glacial cycles. Drilling was completed at this site in December 2004, reaching a drilling depth of 3270.2 m, 5 m above bedrock. Present-day annual average air temperature is −54.5 °C and snow accumulation 25 mm/y. Information about the core was first published in Nature on 10 June 2004. [2]