Greenland is a self-governing Danish province located between the Arctic and Atlantic Oceans, east of the Canadian Arctic Archipelago. Though physiographically and ethnically an Arctic island nation associated with the continent of North America, politically and historically Greenland is closely tied to Europe, specifically Iceland, Norway, and Denmark. In 1978, Denmark granted home rule to Greenland, making it an equal member of the Rigsfællesskab. Greenland is the world's largest island and largest colony by area (Australia and Antarctica are considered continents rather than islands). The Atlantic Ocean borders Greenland's southeast; the Greenland Sea is to the east; the Arctic Ocean is to the north; and Baffin Bay is to the west. The nearest countries are Iceland, east of Greenland in the Atlantic Ocean, and Canada, to the west and across Baffin Bay. Greenland is the world's largest island, and is the largest dependent territory by area in the world. It also contains the world's largest national park.
The total area of Greenland measures 2,166,086 km² (836,109 sq mi), of which the Greenland ice sheet covers 1,755,637 km² (677,676 sq mi) (81%). The coastline of Greenland is 39,330 km (24,430 mi) long, about the same length as the Earth's circumference at the Equator.
The weight of the massive Greenlandic ice cap has depressed the central land area to form a basin lying more than 300 m (1,000 ft) below sea level.
All towns and settlements of Greenland are situated along the ice-free coast, with the population being concentrated along the Western coast. The northeastern part of Greenland, which includes sections of North Greenland and East Greenland, is not part of any municipality, but is the site of the world's largest national park, Northeast Greenland National Park.
At least four scientific expedition stations and camps had been established in the ice-covered central part of Greenland (indicated as pale blue in the map to the right), on the ice sheet: Eismitte, North Ice, North GRIP Camp and The Raven Skiway. Currently, there is a year-round station, Summit Camp, on the ice sheet, established in 1989. The radio station Jørgen Brøndlund Fjord was, until 1950, the northernmost permanent outpost in the world.
The extreme north of Greenland, Peary Land, is not covered by an ice sheet, because the air there is too dry to produce snow, which is essential in the production and maintenance of an ice sheet. If the Greenland ice sheet were to completely melt away, sea level would rise by more than 7 m (23 ft) and Greenland would most likely become an archipelago.
Between 1989 and 1993, U.S. and European climate researchers drilled into the summit of Greenland's ice sheet, obtaining a pair of two-mile-long (3.2 km) ice cores. Analysis of the layering and chemical composition of the cores has provided a revolutionary new record of climate change in the Northern Hemisphere going back about 100,000 years and illustrated that the world's weather and temperature have often shifted rapidly from one seemingly stable state to another, with worldwide consequences. The glaciers of Greenland are also contributing to global sea level rise at a faster rate than was previously believed. Between 1991 and 2004, monitoring of the weather at one location (Swiss Camp) found that the average winter temperature had risen almost 6 °C (approx. 10 °F).Other research has shown that higher snowfalls from the North Atlantic oscillation caused the interior of the ice cap to thicken by an average of 6 cm/yr between 1994 and 2005.
However, a recent study suggests a much warmer planet in relatively recent geological times:
Scientists who probed two kilometers (1.2 miles) through a Greenland glacier to recover the oldest plant DNA on record said Thursday the planet was far warmer hundreds of thousands of years ago than is generally believed. DNA of trees, plants and insects including butterflies and spiders from beneath the southern Greenland glacier was estimated to date to 450,000 to 900,000 years ago, according to the remnants retrieved from this long-vanished boreal forest. That view contrasts sharply with the prevailing one that a lush forest of this kind could only have existed in Greenland as recently as 2.4 million years ago. The existence of those DNA samples suggest the temperature probably reached 10 degrees C (50 degrees Fahrenheit) in the summer and -17 °C (1 °F) in the winter. They also indicated that during the last interglacial period, 116,000–130,000 years ago, when temperatures were on average 5 °C (9 °F) higher than now, the glaciers on Greenland did not completely melt away.
In 1996, the American "Top of the World" expedition found the world's northernmost island off Greenland: ATOW1996. An even more northerly candidate was spotted during the return from the expedition, but its status is yet to be confirmed.
In 2007, the existence of a "new" island was announced. Named "Uunartoq Qeqertoq" (English: Warming Island), this island has always been present off the coast of Greenland, but was covered by an ice sheet. This ice sheet was discovered to be shrinking rapidly in 2002, and by 2007 had completely melted away, leaving the exposed island. |
