Wednesday, 22 June 2011

Logan Mount



Mount Logan is the highest mountain in Canada and the second-highest peak in North America, after Mount McKinley (Denali). The mountain was named after Sir William Edmond Logan, a Canadian geologist and founder of the Geological Survey of Canada (GSC). Mount Logan is located within Kluane National Park and Reserve[3] in southwestern Yukon and is the source of the Hubbard and Logan Glaciers. Logan is believed to have the largest base circumference of any non-volcanic mountain on Earth (a large number of shield volcanoes are much larger in size and mass), with the massif containing eleven peaks over 5,000 metres (16,400 ft).[4][5]
Because of active tectonic uplifting, Mount Logan is still rising in elevation. Before 1992, the exact height of Mount Logan was unknown and measurements ranged from 5,959 metres (19,551 ft) to 6,050 metres (19,849 ft). In May 1992, a GSC expedition climbed Mount Logan and fixed the current height of 5,959 metres (19,551 ft) using GPS.[4]
Temperatures are extremely cold on and near Mount Logan. On the 5,000 m high plateau, air temperature hovers around −45 °C (−49 °F) in the winter and reaches near freezing in summer with the median temperature for the year around −27 °C (−17 °F). Minimal snow melt leads to a significant ice cap, reaching almost 300 m (984 ft) in certain spots.[5] A temperature of −77.5 °C (−107.5 °F) was recorded in May 1991, which made Mount Logan the northern hemisphere's Pole of Cold. [6]

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