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A typical ice drill core dog has a dog-leg shape, and will be built into the drill head with the ability to rotate, and with a spring supplying some pressure against the core. When the drill is lifted, the sharp point of the core dog engages and rotates around, causing the core to break.
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.
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1967 – Lyle Hanson for ice-core drilling in Greenland and Antarctica. Wilford Weeks for research on the formation and physical properties of sea ice. [56] 1970 – Guenther Frankenstein for SS Manhattan work and assistance in recovery of a downed B-52. [56] 1971 – James Hicks for fog-dispersion techniques for airfields. [56]
This is a list of ice cores drilled for scientific purposes. Note that many of these locations are on moving ice sheets, and the latitude and longitude given is as of the date of drilling. Note that many of these locations are on moving ice sheets, and the latitude and longitude given is as of the date of drilling.
The first drilling of the Greenland Ice Core Project went only a few hundred meters into the glacier ice. [11] But from 1989 to 1992 GRIP successfully drilled a 3029-meter ice core to the bed of the Greenland ice sheet at Summit ( 72°34.74′N 37°33.92′W / 72.57900°N 37.56533°W / 72.57900; -37.56533
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
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.
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