Where do the Mount Logan Ice Cores come from?

Figure: Location map or figure showing location of ice-coring sites on and around Mount Logan.

Since 1980, several hundred meters of ice cores have been recovered from the Mount Logan region:

The first ice cored drilled on Mount Logan was recovered in 1980 from the Northwest Col by an expedition led by Dr. Gerry Holdsworth, now a fellow of the Arctic Institute of North America, Calgary. The ice was recovered to a depth of 103 m, but the drill did not reach bedrock. That core represents a time interval of ~280 years (back to ~1700 AD).

In 1996, a team from the University of New Hampshire (USA) recovered a 160-m core from the Eclipse Icefield (3100 m elevation, 40 km from Mount Logan). This was a test for an ice drill designed by glaciologist Erik Blake, based in Whitehorse. The 1996 core represents ice of the last 100 years (back to ~AD 1894). Several more cores were later at this site in 2002 by an American university team using Erik Blake's drill. The deepest of these cores was 345-m long, but the drill did not reach bedrock. This core is estimated to preserve a 550-m long climate record.

At Prospector-Russell Col ("PR Col", elevation 5340 m) a 188-m core was drilled down to bedrock by a team from the Geological Survey of Canada over the course of two seasons (2001 and 2002). This is the oldest ice-core record ever obtained from the region, spanning more than 12,000 years of climate history.

At King Col (elevation 4150 m) on the southwest flank of Mount Logan, a team from Japan's National Institute of Polar Research drilled a core down to 220 m depth, not reaching bedrock. The King Col core, obtained in 2002, is estimated to span 1000 years.