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Ernest de Koven Leffingwell (January 13, 1875January 27, 1971) was an arctic explorer, geologist and Spanish-American War veteran. During the period from 1906 to 1914, Leffingwell spent 9 summers and 6 winters on the Arctic coast of Alaska, making 31 trips by dog sled and/or small boats.〔 He created the first accurate map of a large part of the Alaskan arctic coastline. He was the first to scientifically describe permafrost and to pose theories about permafrost which have largely proven true. He accurately identified the oil potential of the North Slope region of Alaska.〔 ==Biography== Ernest de Koven Leffingwell was born January 13, 1875, in Knoxville, Illinois, to Charles and Elizabeth (née Francis) Leffingwell. He attended the grammar school at Racine College, then attended Trinity College, Hartford, Connecticut, where he was captain of the track team his senior year, graduated with the AB degree in 1895 and was awarded a MA in 1900. He studied physics and geology at the University of Chicago 1896 to 1898 and 1900 to 1906. He played on the Chicago Maroons football team. Leffingwell had passed his preliminary examination and was a doctoral candidate when he left for Alaska in 1906, but apparently did not complete the degree. He taught science at St Alban's school in Knoxville, Illinois in 1895–96 and 1903–04, in the latter period also serving as Superintendent. During the Spanish-American War he served as a Seaman on the US battleship ''Oregon'' during its celebrated dash around Cape Horn and in the Battle of Santiago.〔("Ernest DeKoven Leffingwell" ) ''One thousand American men of mark today'' American Men of Mark, New York, 1916〕〔"Obituaries" "Ernest deKoven Leffingwell" ''Polar Record 16'' (101) pp282-3, 1971 〕〔Phi Upsilon Fraternity (1917) (''The twelfth general Catalogue of the Psi Upsilon Fraternity'' ) p642〕〔Ernest deKoven Leffingwell Alumni Folder, Trinity College Archives, Trinity College, Hartford, Connecticut.〕〔''The University Record (University of Chicago) v11'' (p 40 ), 1907〕〔("Events and Comment" "'Leff', Polar Bearer" ) ''University of Chicago Magazine 7'' (3) January 1915. p 69.〕 He led the science staff in the 1901 Baldwin-Ziegler Polar Expedition, which failed in its attempt to reach the North Pole from Franz Josef Land.〔 On this expedition, he became friends with Danish explorer Ejnar Mikkelsen. Subsequently, the two raised funds for their own expedition. Leffingwell's father, who had become wealthy from his ownership of a fruit ranch in California, contributed $5000, and Mikkelsen raised a comparable amount in England and New York. Their venture became the Anglo-American Polar Expedition of 1906-1908 which aimed to explore the Beaufort Sea. At that time, many experts believed than an undiscovered land mass lay in this region, since such a mass could account for observed patterns of arctic currents and tides.〔〔Mills, William James (2003) ("Mikkelsen, Ejnar (1880-1971)" ) ''Exploring polar frontiers: a historical encyclopedia, Volume 1'' pp 426 ff, ABC-CLIO ISBN 1-57607-422-6, ISBN 978-1-57607-422-0〕〔Leffingwell 1915a〕 The underfunded expedition fared badly but achieved some positive results. No new land was discovered, but they delineated part of the continental shelf and Leffingwell began his mapping efforts. Their ship, the ''Dutchess of Bedford'', was locked in pack ice and destroyed, but they salvaged the wood to build a cabin which Leffingwell used intermittently through 1914. Mikkelsen returned to the US in 1907, but Leffingwell remained on the arctic coast for another year. He returned to the North Slope 1909-1912 and 1913-1914, working with one assistant to map 250 km of the arctic coast, and the Canning River valley .〔〔〔 After spending a year and a half writing up his results at the United States Geological Survey in Washington, Leffingwell retired to Whittier, California, listing his occupation in 1917 as citriculturist. He moved to Carmel, California about 20 years later. When he died in 1971, he was believed to have been the oldest surviving polar explorer.〔〔〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ernest de Koven Leffingwell」の詳細全文を読む スポンサード リンク
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