Greenland Sea

Greenland Sea

Greenland Sea iceberg
Coordinates 76°N 8°W / 76°N 8°W / 76; -8Coordinates: 76°N 8°W / 76°N 8°W / 76; -8
Type Sea
Basin countries Greenland, Iceland, Norway
Surface area 1,205,000 km2 (465,300 sq mi)
Average depth 1,444 m (4,738 ft)
Max. depth 4,846 m (15,899 ft)
Water volume 1,747,250 km3 (419,000 cu mi)
References [1][2]

The Greenland Sea is a body of water that borders Greenland to the west, the Svalbard archipelago to the east, Fram Strait and the Arctic Ocean to the north, and the Norwegian Sea and Iceland to the south. The Greenland Sea is often defined as part of the Arctic Ocean,[1][2][3] sometimes as part of the Atlantic Ocean.[4] However, definitions of the Arctic Ocean and its seas tend to be imprecise or arbitrary. In general usage the term "Arctic Ocean" would exclude the Greenland Sea.[5] In oceanographic studies the Greenland Sea is considered part of the Nordic Seas, along with the Norwegian Sea. The Nordic Seas are the main connection between the Arctic and Atlantic oceans and, as such, could be of great significance in a possible shutdown of thermohaline circulation. In oceanography the Arctic Ocean and Nordic Seas are often referred to collectively as the "Arctic Mediterranean Sea", a marginal sea of the Atlantic.[6][7][8]

The sea has Arctic climate with regular northern winds and temperatures rarely rising above 0 °C. It previously contained the Odden ice tongue (or Odden) area, which extended eastward from the main East Greenland ice edge in the vicinity of 72–74°N during the winter and acted as a key winter ice formation area in the Arctic. The West Ice forms in winter in the Greenland Sea, north of Iceland, between Greenland and Jan Mayen island. It is a major breeding ground of harp seal and hooded seal that has been used for seal hunting for more than 200 years.

Extent

The International Hydrographic Organization defines the limits of the Greenland Sea as follows:[9]

On the North. A line joining the Northernmost point of Spitzbergen [sic] [Svalbard] to the Northernmost point of Greenland.

On the East. The West coast of West Spitzbergen [sic] [island of Spitsbergen].

On the Southeast. A line joining the Southernmost point of West Spitzbergen [sic] to the Northern point of Jan Mayen Island, down the West coast of that island to its Southern extreme, thence a Line to the Eastern extreme of Gerpir (67°05'N, 13°30'W) [NB Actually at 65°05′N 13°30′W / 65.083°N 13.500°W / 65.083; -13.500] in Iceland.

On the Southwest. A line joining Straumnes (NW extreme of Iceland) to Cape Nansen (68°15′N 29°30′W / 68.250°N 29.500°W / 68.250; -29.500) in Greenland.

On the West. The East and Northeast coast of Greenland between Cape Nansen and the northernmost point.

History

While the sea is known for millennia, its first scientific investigations were carried out in 1876–1878 within the Norwegian North-Atlantic Expedition.[10] Since then, many countries, mostly Norway, Iceland and Russia have sent scientific expeditions to the area. The complex water current system was detailed in 1909 by the Fridtjof Nansen.[2]

The Greenland Sea was a popular hunting ground for the whaling industry for 300 years, until 1911, primarily based in Spitsbergen. At that point, the formerly rich whale population here, was so depleted that the industry was no longer profitable. The remaining whales of the Greenland Sea has been protected ever since, but the populations had not shown any proof of significant regeneration. In the last 20 years, polar biologists reports an increase in the local bowhead whale population and in 2015, arctic scientists discovered a surprising abundance of them in a small area. These results may be interpreted as an early sign of a beginning recovery for this particular species, that once formed the largest bowhead population in the world, at an estimated 52,000 whales.[11]

The inuit hunted whales on a non-industrial scale in the Greenland Sea since the fifteenth century, as evidenced by archaeology.[11]

Sea topography

Geography and geology

Eyjafjörður, the longest fjord in Northern Iceland, belongs to the Greenland Sea.

The Greenland Sea is bounded to the west by the island of Greenland, and to the south by the Denmark Strait and Iceland. To the southeast, behind the Jan Mayen island (Norway) lies the vast expanse of the Norwegian Sea, of which Greenland Sea may be considered an extension. Across the Fram Strait to the northeast, the sea is delimited by the Svalbard archipelago (Norway).

The bottom of the Greenland Sea is a depression bounded to the south by the underwater Greenland-Iceland ridge and to the east by the Mohns Ridge and Knipovich Ridge (parts of the Mid-Atlantic Ridge). To the west, the bottom rises first slowly, but then rapidly toward the wide Greenland coastal strip.[1] Silts fill the submarine hollows and gorges; silty sands, gravel, boulders, and other products of erosion coat the shelves and ridges.[2]

Although the deepest point inside of the sea is 4846 meters, depths down to 5570 meters have been measured in the Molloy Deep of the Fram Strait which connects the sea to the Arctic Ocean on the north.[12]

Major islands of the Greenland Sea include the Svalbard archipelago, Jan Mayen as well as coastal islands off the NE Greenland shores, such as Hovgaard, Ella, Godfred Hansens, Île-de-France, Lynn, Norske and Schnauders Island. Of those, only the Svalbard islands are inhabited,[13] and Jan Mayen has only temporal military staff. After the League of Nations gave Norway jurisdiction over the island, in 1921 Norway opened the first meteorological station there, which was a subject of contention between Germany and United Kingdom during World War II.[14] Several radio and meteorological stations operate on the island nowadays.

Hydrology, climate and ice

A beach on Jan Mayen island

The climate is Arctic and varies significantly across the vast sea area. Air temperatures fluctuate between −49 °C (−57 °F), near Spitsbergen in winter, and 25 °C (77 °F) off Greenland in summer. Averages are −10 °C (14 °F) in the south and −26 °C (−15 °F) in the north in February, which is the coldest month. The corresponding values for the warmest month, August, are 5 °C (41 °F) in the south and 0 °C (32 °F) in the north.[1][2] The summer is very short, as the number of days per year when the temperature rises above 0 °C varies between 225 on the south to 334 in the north. The annual precipitation is 250 mm (10 in) in the north, but is twice higher in the south.

Northern winds continue through the whole year, cooling the surface water and bringing ice to the south. The average surface water temperature is about −1 °С (30 °F) or lower in the north and 1–2 °C in the south; the corresponding summer temperatures are about 0 °C and 6 °C (43 °F).[2] The bottom water temperatures are below −1 °С. The surface water salinity is 33.0–34.5 parts per thousand (‰) in the eastern and below 32.0‰ in the western parts, increasing to 34.9‰ toward the bottom. The water color is green. Tides are semi-diurnal with the average height of 4.4 m. Together with the water currents, they break up the floating ice sheets and mix various water layers both laterally and along the depth.[1][2]

The progressively colder waters of North Atlantic Current sink in the Arctic Ocean, returning south in the form of cold East Greenland Current, an important part of the Atlantic conveyor belt, which flows along the western part of the sea. Along the eastern part flows the warm Spitsbergen Current, a part of Gulf Stream. Mixtures of cold, fresh water ice melt and the warm, salty Spitsbergen Current may experience cabbeling, and might contribute to thermohaline circulation. The combination of those currents creates a counter-clockwise water flow in the central part of the sea.[1][15][16]

Because of frequent fogs and winds and currents, which continuously transport ice and icebergs through the Greenland Sea to the south, the Greenland Sea has a narrow window for commercial navigation – the ice season starts in October and ends in August. Three types of floating ice are distinguished: Arctic pack ice (several meters thick), sea ice (about a meter thick) and freshwater icebergs.[2]

West Ice

Frazil ice

In winter, a large area north of Iceland, between Greenland and Jan Mayen, which is called West Ice is covered by continuous ice. It is a major breeding ground for seals, including harp seal, hooded seal and gray seal.[17][18] It was discovered in the early 18th century by British whalers and since late 1750s was used for seal hunting. The hunting was especially intensive in the 19th century, but declined in the 20th century due to hunting restrictions and then declined market demand.[19] Around 5 April 1952, a major storm resulted in disappearance of ships with 79 Norwegian seal hunters on board. Seven other Norwegian seal hunting vessels shipwrecked the same month.[20][21][22][23]

Odden ice tongue

Pancake ice

The Odden ice tongue or simply the Odden (Odden is Norwegian word for headland) was a key winter ice formation area in the Arctic. It was known for a long time and was encountered by Fridtjof Nansen but was only fully understood with the advent of satellite imagery.[24]

The Odden had a length of about 1,300 km and covered an area of up to 330,000 km² in most years. It extended eastward from the main East Greenland ice edge in the vicinity of 72–74°N during the winter because of the presence of very cold polar surface water in the Jan Mayen Current, which diverts some water eastward from the East Greenland Current at that latitude. Most of the already formed ice continued floating south, driven by the wind, so a cold open water surface was exposed on which new ice formed as frazil ice and pancake ice in the rough seas, producing a giant tongue shape.[25] The salt rejected back into the ocean from this ice formation caused the surface water to become denser and sink, sometimes to great depths (2500 m or more), making this one of the few regions of the ocean where winter convection occurred, which helped drive the entire worldwide system of surface and deep currents known as the thermohaline circulation.[15][16] Since the 1990s, the Odden Ice Tongue rarely develops.

Fauna

The Greenland Sea is densely inhabited by the organisms that form the base of the oceanic food chain. Large invertebrates, fish (such as cod, herring, redfish, halibut, and plaice), birds and mammals (including various species of seals, whales, and dolphins) all feed on the smaller invertebrates and small organisms. Mosses, lichens, and scanty bushes around the coasts serve as food to the deer and musk oxen, which in turn are hunted by the polar bear.[2]

The Greenland sea was formerly home to a large population of various whale species, especially bowhead whales, but the whaling industry decimated them greatly from the beginning of the 1600s till 1911. The last few decades there have been a few signs, indicating a beginning recovery.[11]

Oil and gas

US Geological Survey has estimated that at least 13% of the worlds undiscovered oil deposits and 30% of the worlds undiscovered gas pockets are located in the Arctic, with the Greenland Sea potentially holding large amounts of natural gas and lesser amounts of natural gas liquids and crude oil.[26][27] This has led the Greenland's minister and provincial council to offer a large number of off-shore concessions to potential hydrocarbon (oil and gas) extraction. The majority of the concessions are located in seas west of Greenland (primarily the Davis Strait and Baffin Bay), with 19 concessions in the Greenland Sea alone.[28][29]

In late 2013, a total of three consortia obtained hydrocarbon extraction rights to four large areas of the Greenland Sea from the Greenland Bureau of Mineral and Petroleum. The consortia are led by the oil companies of Statoil, Chevron and Eni, but includes several other smaller companies such as Shell, British Petroleum, Dong Energy and Nunaoil. Later, a fifth hydrocarbon concession has been sold.[30][31] Exxon Mobil, the largest oil company in the world and with a lot of experience in the Arctic, was also applying for oil extraction rights in the Greenland Sea initially, but pulled out in December 2013 for unexplained reasons, concentrating efforts on shale gas and the American market instead.[32][33]

Drilling for oil on deep waters in an ice-filled Arctic environment is a potentially new undertaking for the oil industry and poses many risks and dangers. Because of these difficulties the Greenland Minster Council expects the first exploratory drills to take place no sooner than the mid 2020s. They estimates that a full preliminary program with seismic surveys, exploratory drills and proper safety measures will take about 16 years and an investment of about 500 million dollars in each concession.[28][33]

See also

References

  1. 1 2 3 4 5 6 "Greenland Sea" (in Russian). Great Soviet Encyclopedia.
  2. 1 2 3 4 5 6 7 8 9 "Greenland Sea". Encyclopædia Britannica on-line.
  3. ↑ Greenland Sea, MarBEF Data System – European Marine Gazetteer
  4. ↑ Reddy, M. P. M. (2001). Descriptive Physical Oceanography. Taylor & Francis. p. 8. ISBN 978-90-5410-706-4. Retrieved 26 November 2010.
  5. ↑ Serreze, Mark C.; Barry, Roger Graham (2005). The Arctic climate system. Cambridge University Press. p. 19. ISBN 978-0-521-81418-8. Retrieved 27 November 2010.
  6. ↑ Blindheim, Johan; Østerhus, Svein (2005). "The Nordic Seas, Main Oceanographic Features". In Drange, Helge. The Nordic seas: an integrated perspective : oceanography, climatology, biogeochemistry, and modeling. American Geophysical Union. pp. 11–38. ISBN 978-0-87590-423-8.
  7. ↑ Loeng, Harald (2005). "Chapter 9: Marine Systems". In Symon, Carolyn. Arctic Climate Impact Assessment. Cambridge University Press. pp. 453–493. ISBN 978-0-521-86509-8. Retrieved 27 November 2010.
  8. ↑ Meincke, J; Rudels, B; Friedrich, H. J. (1997). "The Arctic Ocean–Nordic Seas thermohaline system". ICES Journal of Marine Science. 54 (3): 283–299. doi:10.1006/jmsc.1997.0229.
  9. ↑ "Limits of Oceans and Seas, 3rd edition" (PDF). International Hydrographic Organization. 1953. Retrieved 6 February 2010.
  10. ↑ Norwegian North-Atlantic Expedition (1876–1878), also
  11. 1 2 3 Matt Walker (22 July 2015). "secret whale refuge". BBC Earth. Retrieved 27 October 2015.
  12. ↑ Soltwedel, T., Miljutina, M., Mokievsky, V., Thistle, D., Vopel, K. (2003). "The meiobenthos of the Molloy Deep (5600 m), Fram Strait, Arctic Ocean". Vie et Milieu. 53 (1): 1–13. hdl:10013/epic.16261.
  13. ↑ Islands of Greenland (Denmark), United Nations Environment Programme (UNEP)
  14. ↑ Rigge, Simon (1980), War in the Outposts, pp. 24–25. Alexandria, Virginia: Time-Life Books, ISBN 0809433818.
  15. 1 2 van Aken; Hendrik Mattheus (2007). The oceanic thermohaline circulation: an introduction. pp. 127–130. ISBN 0-387-36637-7.
  16. 1 2 Malanotte-Rizzoli, Paola; Robinson, Allan R. (1994). Ocean processes in climate dynamics: global and mediterranean examples. Springer. pp. 216–217. ISBN 0-7923-2624-5.
  17. ↑ Johnsen, Geir; Sakshaug, Egil; Kovacs, Kit (2009). Ecosystem Barents Sea. Tapir Academic Press. ISBN 82-519-2461-8.
  18. ↑ Feldhamer, George A.; Thompson, Bruce Carlyle; Chapman, Joseph A. (2003). Wild mammals of North America: biology, management, and conservation. JHU Press. p. 812. ISBN 0-8018-7416-5.
  19. ↑ Mowat, Farley (2004). Sea of slaughter. Stackpole Books. p. 341. ISBN 0-8117-3169-3.
  20. ↑ Fra meteorologihistorien: Orkanen i Vestisen, april 1952 (From meteorology story: Hurricane, West Ice, April 1952), The Norwegian Meteorological Institute, 4 April 2008 (in Norwegian)
  21. ↑ Orkanen i Vestisen april 1952. fiskeribladetfiskaren.no, 8 April 2008 (in Norwegian)
  22. ↑ Davidsen, Av Bjørn (8 April 2008) Da alarmen gikk i Vestisen, FiskeribladetFiskaren (in Norwegian)
  23. ↑ Arnold Farstad: Mysteriet i Vestisen: selfangsttragedien som lamslo nasjonen, ("The West Ice Mystery: The Seal Hunting Tragedy that Stunned the Nation") Samlaget, 2001, ISBN 82-521-5849-8
  24. ↑ Comiso, Josefino (2010). Polar Oceans from Space. Springer. pp. 366, 383. ISBN 0-387-36628-8.
  25. ↑ Carbon Cycling in Arctic Marine Ecosystems: Case Study Young Sound. Museum Tusculanum Press. pp. 20–21. ISBN 87-635-1278-5.
  26. ↑ "90 Billion Barrels of Oil and 1,670 Trillion Cubic Feet of Natural Gas Assessed in the Arctic". US Geological Survey (USGS). 23 July 2008. Retrieved 17 April 2016.
  27. ↑ "Assessment of Undiscovered Oil and Gas Resources of the East Greenland Rift Basins Province" (PDF). US Geological Survey (USGS). August 2007. Retrieved 17 April 2016.
  28. 1 2 Kevin Casey (20 January 2014). "Greenland's New Frontier: Oil and Gas Licenses Issued, Though Development Likely Years Off". The Arctic Institute. Retrieved 16 April 2016.
  29. ↑ "Current Licences". Bureau of Mineral and Petroleum (Greenland). Retrieved 16 April 2016.
  30. ↑ "Map of exclusive hydrocarbon licences" (PDF). Bureau of Mineral and Petroleum (Greenland). February 2016. Retrieved 16 April 2016.
  31. ↑ "Approved Hydrocarbon Activities". Bureau of Mineral and Petroleum (Greenland). 31 October 2015. Retrieved 16 April 2016.
  32. ↑ "Managing Arctic resources". ExxonMobil. Retrieved 16 April 2016.
  33. 1 2 Kevin McGwin (12 December 2013). "If Exxon speaks, will oil industry listen?". The Arctic Journal. Retrieved 16 April 2016.

Further reading

Wikimedia Commons has media related to Greenland Sea.


This article is issued from Wikipedia - version of the 11/14/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.