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.
Their machinery could drill through 15–20 feet (4.6–6.1 m) of ice in 40–50 minutes. From 1300 to 3,000 feet (910 m) in depth, core samples were 4 + 1 ⁄ 4 inches (110 mm) in diameter and 10 to 20 feet (6.1 m) long. Deeper samples of 15 to 20 feet (6.1 m) long were not uncommon.
A team retrieved a 9,186-foot-long (2,800-meter) ice core from Antarctica that's nearly as long as 25 soccer fields end-to-end. ... the heartbreaking act of carrying her dead calf for more than ...
A more recent version of the sampling process makes use of modern glacial ice cores. Although less rich in 18 O than seawater, the snow that fell on the glacier year by year nevertheless contained 18 O and 16 O in a ratio that depended on the mean annual temperature.
During the Last Glacial Maximum, much of the world was cold, dry, and inhospitable, with frequent storms and a dust-laden atmosphere. The dustiness of the atmosphere is a prominent feature in ice cores; dust levels were as much as 20 to 25 times greater than they are in the present.
What is probably the world's oldest ice, dating back 1.2m years ago, has been dug out from deep within Antarctica. Working at temperatures of -35C, a team of scientists extracted a 2.8km-long ...
The ice must be cut through, broken up, or melted. Tools can be directly pushed into snow and firn (snow that is compressed, but not yet turned to ice, which typically happens at a depth of 60 metres (200 ft) to 120 metres (390 ft)); [22] this method is not effective in ice, but it is perfectly adequate for obtaining samples from the uppermost layers. [23]
The melting of Alaska's Juneau icefield, home to more than 1,000 glaciers, is accelerating. The snow covered area is now shrinking 4.6 times faster than it was in the 1980s, according to a new study.