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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.
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 Greenland ice sheet is an ice sheet which forms the second largest body of ice in the world. It is an average of 1.67 km (1.0 mi) thick, and over 3 km (1.9 mi) thick at its maximum. [ 2 ] It is almost 2,900 kilometres (1,800 mi) long in a north–south direction, with a maximum width of 1,100 kilometres (680 mi) at a latitude of 77°N ...
The Dye 3 cores were part of the GISP and, at 2037 meters, the final Dye 3 1979 core was the deepest of the 20 ice cores recovered from the Greenland ice sheet. [5] The surface ice velocity is 12.5 ma −1, 61.2° true. [11] At 500 m above bedrock, the ice velocity is ~10 ma −1, 61.2° true. [11]
The Greenland Ice Sheet Project (GISP) was a decade-long project to drill ice cores in Greenland that involved scientists and funding agencies from Denmark, Switzerland and the United States. Besides the U.S. National Science Foundation (NSF), funding was provided by the Swiss National Science Foundation and the Danish Commission for Scientific ...
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
Ice core samples from Camp Century were used to create stable isotopes analyses used to develop climate models. [6] [7] [8] Analysis of soil contained in the samples suggests that the site was ice-free as recently as 400,000 years prior, indicating a much reduced Greenland ice sheet and therefore much higher sea levels. [9]
5.2 Greenland. 5.3 United States. ... This is a list of ice cores drilled for scientific purposes. Note that many of these locations are on moving ice sheets, and the ...