| 词条 | Ellef Ringnes Island |
| 释义 |
| name = Ellef Ringnes Island | image_name = EllefRingnesIandneighbourhood.png | image_caption = Closeup of Ellef Ringnes Island and neighbouring islands | image_size = | map_image = Ellef Ringnes Island.svg | map_caption = | native_name = | native_name_link = Inuktitut | nickname = | location = Arctic Ocean | coordinates = {{coord|78|37|N|101|56|W|region:CA-NU_type:isle_scale:5000000|display=inline,title|name=Ellef Ringnes Island}} | archipelago = Sverdrup Islands Queen Elizabeth Islands Canadian Arctic Archipelago | total_islands = | major_islands = | area_km2 = 11295 | rank = 69th | highest_mount = Isachsen Dome | elevation_m= 260 | country = Canada | country_admin_divisions_title = Territory | country_admin_divisions = Nunavut | country_admin_divisions_title_1 = Region | country_admin_divisions_1 = Qikiqtaaluk | country_largest_city = Isachsen | country_largest_city_population = 0 | population = Uninhabited | population_as_of = | density_km2 = | ethnic_groups = | additional_info = }} Ellef Ringnes Island is one of the Sverdrup Islands in Qikiqtaaluk Region, Nunavut, Canada. Also a member of the Queen Elizabeth Islands and Canadian Arctic Archipelago, it is located in the Arctic Ocean, east of Borden Island, and west of Amund Ringnes Island. It has an area of {{convert|11295|km2|abbr=on}}, making it the 69th largest island in the world (slightly larger than Jamaica) and Canada's 16th largest island. Its highest mount is {{convert|260|m|abbr=on}}. The island was named by Otto Sverdrup for Oslo brewer Ellef Ringnes, one of the sponsors of his expedition. It was first sighted by one of his men in 1901. The island was then claimed by Norway from 1902 until the claim was relinquished (in favour of Canada) in 1930. A High Arctic Weather Station (H.A.W.S.) called Isachsen lies on the west coast of the island. It was opened April 3, 1948 as part of a joint Canada-U.S. military effort to support a weather station network. When it closed on September 19, 1978, it was replaced with an automated weather system. The station represented the only known permanent human settlement of the island. Ellef Ringnes Island was the last landmass to be visited by the Earth's wandering Magnetic North Pole. In April and May 1994, Larry Newitt, of the Geological Survey of Canada, and Charles Barton, of the Australian Geological Survey Organization, conducted a survey to determine the average position of the North Magnetic Pole at that time. They established a temporary magnetic observatory on Lougheed Island, close to the predicted position of the pole. They determined that the average position of the North Magnetic Pole in 1994 was located on the Noice Peninsula, southwest Ellef Ringnes Island, at 78.3° N, 104.0° W. The pole shifted from the island that year and now lies some 250 miles (400 km) to the NNW.[1] The island is also the location and namesake of an episode of The Secret Saturdays. HistoryThe first known sighting of Ellef Ringnes Island was in 1901 by a sledging party consisting of Gunerius Isachsen and Sverre Hassel, members of the Second Norwegian Arctic Expedition of 1898–1902, which was under the command of Otto Sverdrup. The island was named to honour Ellef Ringnes, one of the principal patrons of the expedition. At the time of the discovery of Ellef Ringnes Island, the expedition was based at Goose Fiord on the south coast of Ellesmere Island. Isachsen and Hassel made their initial sighting of Ellef Ringnes Island on April 23 as they rounded the southwest corner of Amund Ringnes Island, an island they had sighted and partly explored the previous year. The following day, Isachsen and Hassel traveled across Hassel Sound making a landfall at the southern extremity of the island. In the course of the following 20 days, they succeeded in circumnavigating Ellef Ringnes. The resulting map and notes on geological specimens are published in Otto Sverdrup's narrative New Land (1904).[2] In 1948. the federal Department of Transport and the United States Weather Bureau jointly established a meteorological station at Isachsen. The station was in operation for thirty years. Drilling took place on the island in the seventies by Panarctic Oils. GeologyThe island is characterized by broad lowlands and locally by dissected uplands which reflect the diversity of structures and lithological characters of the bedrock formations. The island is rimmed by low shelving coastal areas, domal structures (salt dome) with cores of diapiric anhydrite and secondary gypsum constitute striking features of the landscape. Two major structural provinces of the Arctic Archipelago are represented: the Sverdrup basin which includes the greater part of the island and preponderant thickness of sediments: and the Arctic Coastal Plain, an area at the north-eastern extremity of the island.[3] These salt domes create the highest topographic features. While most of the island is flat lying, the salt domes stand out clearly on satellite. There are seven domes, Dumbbells, Contour, Hoodoo, Malloch, Haakon, Helicopter and Isachsen Dome(260m) which is the highest point on the island. On the north part of the island, there is a concentration of gabbro and diabase dikes and sills. Most of the rock is Jurassic to Cretaceous with the northern part (Isachsen Peninsula) being Tertiary. The Jurassic and Cretaceous rocks are varying formations of sandstone and shale. The sediment was deposited in the Sverdrup Basin. The salt diapirs are Carboniferous. Flora and faunaEllef Ringnes Island is interesting to biologists because of its extremely rigorous arctic environment and its resulting meager flora and fauna. Together with Amund Ringnes, Borden, Brock, King Christian, Lougheed, Mackenzie King and Meighen Islands (the so-called northwestern Queen Elizabeth Islands) it constitutes the most barren part of the high arctic region. Some idea of its bleakness is conveyed by the remarks of others who worked there. Stefansson (1921), on visiting Ellef Ringnes in June 1916, wrote "I did not see a blade of grass and the district struck me as the most barren I had even seen"; MacDonald (1961) who spent the field season of 1954 at Isachsen, stated, "My immediate impression of Isachsen was of a region of utter desolation".[4] Summers at Isachsen, the richest locality on the island, are colder than at any other arctic weather station. Accordingly, Ellef Ringnes probably supports fewer forms of life than any other ice-free arctic land mass of comparable size (5,000 sq. mi.). The total confirmed flora comprises 49 species of vascular plants and about 85 of fungi; only 10 species of mammals and 15 of birds have been recorded on the island. Mammals include muskox, Peary caribou, polar bears and foxes [5] References1. ^Geomagnetism : North Magnetic Pole {{webarchive |url=https://web.archive.org/web/20100326000000/http://gsc.nrcan.gc.ca/geomag/nmp/northpole_e.php |date=March 26, 2010 }} , Geological Survey of Canada. 2. ^Stott, Donald F. Ellef Ringnes Island, Canadian Arctic Archipelago. [Ottawa]: Dept. of Energy, Mines and Resources, 1969 3. ^Stott, Donald F. Ellef Ringnes Island, Canadian Arctic Archipelago. [Ottawa]: Dept. of Energy, Mines and Resources, 1969 4. ^McAlpine, J.F. Insects and Related Terrestrial Invertebrates of Ellef Ringnes Island. Paper No. 14, Studies on Arctic Insects, Entomology Research Institute, Canada Department of Agriculture 5. ^Savile, D. B. 0. 1961a. The botany of the northwestern Queen Elizabeth Islands. Canada. J. Bot. 39:909–942 Further reading{{refbegin}}
External links
5 : Islands of the Canadian Arctic Archipelago|Islands of Qikiqtaaluk Region|Islands of the Queen Elizabeth Islands|Sverdrup Islands|Uninhabited islands of Qikiqtaaluk Region |
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