Search results
Results from the WOW.Com Content Network
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 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 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 ...
The team, with members from 12 European scientific institutions, drilled and retrieved a 9,186-foot-long (2,800-meter) ice core from the Antarctic ice sheet. The sample extended so deep that ...
Examination of the Greenland ice cores revealed that in 1831, sulfur fallout — a sign of volcanic activity — was about 6 ½ times greater in Greenland than it was in Antarctica.
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 sample taken from drill. Photo by Lonnie Thompson, Byrd Polar Research Center. Ice cores are cylindrical samples from within ice sheets in the Greenland, Antarctic, and North American regions. [4] [5] First attempts of extraction occurred in 1956 as part of the International Geophysical Year.