Animation of the canyonTopographic map of the bedrock under the ice
Ice-penetrating radar data collected during NASA's Operation IceBridge showed a huge subglacial canyon[4] running from the central region of the island northward into the Arctic Ocean, to the fjord of the Petermann Glacier. The bottom of the canyon is below sea level; the canyon is likely to have influenced basal water flow from the ice sheet interior to the margin. Jonathan Bamber, a geographer at University of Bristol, stated, "The distinctive V-shaped walls and flat bottom suggests water carved the buried valley, not ice."[4]
The canyon is more than 750 kilometres (466 mi) long, up to 800 metres (2,600 ft) deep and 10 kilometres (6 mi) wide, making it the longest canyon discovered on the Earth to date.[5] There are, however, many canyons—including Arizona's Grand Canyon (1,857 meters) and Tibet's Yarlung Tsangpo Grand Canyon (overall 2,268 meters), previously the world's longest—that are deeper.
The canyon predates ice sheet inception and has influenced basal hydrology in Greenland over past glacial cycles.[5][6][7]
Referencesedit
^"Beneath Greenland's ice, a grand canyon". CNN. Retrieved 30 August 2013.
^"Scientists Discover a Mega-Canyon Beneath the Melting Ice Sheets of Greenland". Time. 30 August 2013. Retrieved 30 August 2013.
^Jonathan L. Bamber, Martin J. Siegert, Jennifer A. Griggs, Shawn J. Marshall, and Giorgio Spada, "Paleofluvial Mega-Canyon Beneath the Central Greenland Ice Sheet", Science, 30 August 2013, Vol. 341 no. 6149, pp. 997-999. doi:10.1126/science.1239794
^ abOskin, Becky, "'Grand Canyon of Greenland' discovered under ice sheet", NBC News, August 29, 2013
^ abOskin, Becky. "Grand Canyon of Greenland Discovered under Ice". News.discovery.com. Retrieved 2 September 2013.
^"Greenland's Mega Canyon (narrated video)". NASA. 29 August 2013. Retrieved 30 August 2013.
^"Canyon longer than Grand Canyon found buried under Greenland ice sheet". The Daily Telegraph. 30 August 2013. Retrieved 30 August 2013.
grand, canyon, greenland, grand, canyon, greenland, tentative, canyon, record, length, discovered, underneath, greenland, sheet, reported, journal, science, august, 2013, submitted, april, 2013, scientists, from, university, bristol, jonathan, bamber, universi. The Grand Canyon of Greenland is a tentative canyon of record length discovered underneath the Greenland ice sheet as reported in the journal Science on 30 August 2013 submitted 29 April 2013 by scientists from the University of Bristol led by Jonathan Bamber University of Calgary and University of Urbino who described it as a mega canyon 1 2 3 source source source source source source source source Animation of the canyonTopographic map of the bedrock under the iceIce penetrating radar data collected during NASA s Operation IceBridge showed a huge subglacial canyon 4 running from the central region of the island northward into the Arctic Ocean to the fjord of the Petermann Glacier The bottom of the canyon is below sea level the canyon is likely to have influenced basal water flow from the ice sheet interior to the margin Jonathan Bamber a geographer at University of Bristol stated The distinctive V shaped walls and flat bottom suggests water carved the buried valley not ice 4 The canyon is more than 750 kilometres 466 mi long up to 800 metres 2 600 ft deep and 10 kilometres 6 mi wide making it the longest canyon discovered on the Earth to date 5 There are however many canyons including Arizona s Grand Canyon 1 857 meters and Tibet s Yarlung Tsangpo Grand Canyon overall 2 268 meters previously the world s longest that are deeper The canyon predates ice sheet inception and has influenced basal hydrology in Greenland over past glacial cycles 5 6 7 References edit Beneath Greenland s ice a grand canyon CNN Retrieved 30 August 2013 Scientists Discover a Mega Canyon Beneath the Melting Ice Sheets of Greenland Time 30 August 2013 Retrieved 30 August 2013 Jonathan L Bamber Martin J Siegert Jennifer A Griggs Shawn J Marshall and Giorgio Spada Paleofluvial Mega Canyon Beneath the Central Greenland Ice Sheet Science 30 August 2013 Vol 341 no 6149 pp 997 999 doi 10 1126 science 1239794 a b Oskin Becky Grand Canyon of Greenland discovered under ice sheet NBC News August 29 2013 a b Oskin Becky Grand Canyon of Greenland Discovered under Ice News discovery com Retrieved 2 September 2013 Greenland s Mega Canyon narrated video NASA 29 August 2013 Retrieved 30 August 2013 Canyon longer than Grand Canyon found buried under Greenland ice sheet The Daily Telegraph 30 August 2013 Retrieved 30 August 2013 79 00 00 N 46 00 00 W 79 0000 N 46 0000 W 79 0000 46 0000 Retrieved from https en wikipedia org w index php title Grand Canyon Greenland amp oldid 1168238555, wikipedia, wiki, book, books, library,
