World Library  
Flag as Inappropriate
Email this Article

Beaufort Sea

Beaufort Sea
Type Sea
Basin countries Canada, United States
Surface area 476,000 km2 (184,000 sq mi)
Average depth 1,004 m (3,294 ft)
Max. depth 4,683 m (15,364 ft)
References [1][2]

The Beaufort Sea (French: mer de Beaufort) is a marginal sea of the Arctic Ocean,[3] located north of the Northwest Territories, the Yukon, and Alaska, west of Canada's Arctic islands. The sea is named after hydrographer Sir Francis Beaufort. The major Mackenzie River empties into the Canadian part of the sea, west of Tuktoyaktuk, which is one of the few permanent settlements on the sea shores.

The sea, characterized by severe climate, is frozen over most of the year. Historically, only a narrow pass up to 100 km (62 mi) opened in August–September near its shores, but recently due to climate change in the Arctic the ice-free area in late summer has greatly enlarged. Claims that the seacoast was populated about 30,000 years ago have been largely discredited (see below); present population density is very low. The sea contains significant resources of petroleum and natural gas under its shelf, such as the Amauligak field. They were discovered in the period between the 1950s and 1980s, and their exploration became the major human activity in the area since the 1980s. The traditional occupations of fishery and whale and seal hunting are practiced only locally, and have no commercial significance. As a result, the sea hosts one of the largest colonies of beluga whales, and there is no sign of overfishing. To prevent overfishing in its waters, the US adopted precautionary commercial fisheries management plan in August 2009.[4] In April of 2011 the Canadian government signed a memorandum of understanding with the Inuvialuit as a first step in developing a larger ocean management plan.[5] The Canadian government announced in October 2014 that no new commercial fisheries in the Beaufort Sea will be considered until research has shown sustainable stocks that would be made available to Inuvialuit first.[6]


  • Extent 1
  • Border dispute 2
  • Geography 3
  • Hydrology and climate 4
  • Flora and fauna 5
  • Human activities 6
  • See also 7
  • References 8
  • Bibliography 9
  • Further reading 10
  • External links 11



  • Sea Ice in the Beaufort Sea from NASA Earth Observatory
  • CAC (Civil Applications Committee)/USGS Global Fiducials Program web page containing scientific description and interactive map viewer featuring declassified high-resolution time-series imagery

External links

  • David G. Barber, Ryan Galley, Matthew G. Asplin, Roger De Abreu, Kerri-Ann Warner, Monika Pu?ko, Mukesh Gupta, Simon Prinsenberg, and Stéphane Julien (2009). "Perennial pack ice in the southern Beaufort Sea was not as it appeared in the summer of 2009". Geophysical Research Letters 36 (24): L24501.  
  • Dawn Russell (1992). "International Ocean Boundary Issues and Management Arrangements". In David VanderZwaag. Canadian Ocean Law and Policy. Toronto: Butterworths. pp. 463–505. 
  • Donat Pharand (Autumn 1984). "The Legal Regime of the Arctic: Some Outstanding Issues". International Journal 39: 742–799.  
  • Karin L. Lawson (1981). "Delimiting Continental Shelf Boundaries in the Arctic: The United States—Canada Beaufort Sea Boundary". Virginia International Law Journal 22: 221–246. 

Further reading

  • L. S. Parsons, William Henry Lear, National Research Council of Canada Perspectives on Canadian marine fisheries management, NRC Research Press, 1993 ISBN 0-660-15003-4


  1. ^ a b c Beaufort Sea, Great Soviet Encyclopedia (in Russian)
  2. ^ a b c d e f g Beaufort Sea, Encyclopædia Britannica on-line
  3. ^ John Wright (30 November 2001). The New York Times Almanac 2002. Psychology Press. p. 459.  
  4. ^ Arctic Fishery Management Plan.
  5. ^ Beaufort Sea Commercial Fishing Banned (CBC News 15 April 2011).
  6. ^ No new fisheries in the Arctic following federal ban
  7. ^ "Limits of Oceans and Seas, 3rd edition" (PDF). International Hydrographic Organization. 1953. Retrieved 6 February 2010. 
  8. ^ The Law of the Sea Convention (BP-322E). Retrieved on 2013-03-21.
  9. ^ a b c d e f g h Donald Rothwell (1996). The Polar Regions and the Development of International Law. Cambridge studies in international and comparative law 3. Cambridge University Press. pp. 174, 176.  
  10. ^ Summary of claims, Department of Defense, p. 10
  11. ^ a b US-Canada Arctic border dispute key to maritime riches, BBC News, 2 August 2010
  12. ^ a b c d e Douglas M. Johnston and Phillip M. Saunders (1988). Ocean Boundary Making: Regional Issues and Developments. Taylor & Francis. pp. 48–49.  
  13. ^ Northern interests and Canadian foreign policy, Associate Director Centre for Military and Strategic Studies, University of Calgary
  14. ^ Beaufort Sea Areawide 2006, Tract Map No.8, State of Alaska Department of Natural Resources, Division of oil and gas
  15. ^ a b Sea Changes, Institute of the North
  16. ^ "Secretary of Commerce approves fisheries plan for ArcticSecretary of Commerce approves fisheries plan for Arctic". World of fishing. 20 August 2009. Archived from the original on 15 September 2009. 
  17. ^ Randy Boswell (4 September 2009). "Canada protests U.S. Arctic fishing ban".  
  18. ^ Disputes – international: CIA – The World Factbook. Retrieved on 2013-03-21.
  19. ^ a b c d Mackenzie River, Encyclopædia Britannica on-line
  20. ^ "Poles apart: A record-breaking summer and winter".  
  21. ^ Anderson, Ben (23 September 2012). "Rotting whale meat lures record 80 polar bears to Kaktovik". Alaska Dispatch. Archived from the original on 4 February 2013. While the whale carcass is one reason for the polar bear bonanza, scientists wonder if there isn’t another reason. Namely, the record retreat of Arctic sea ice from the northeast coast of Alaska into the Beaufort Sea. 
  22. ^ Jay, By Chadwick V.; Fischbach, Anthony S. (9 January 2013). "Pacific Walrus Response to Arctic Sea Ice Losses". United States Geological Survey. Archived from the original on 4 February 2013. The extent of Arctic summer sea ice has decreased sharply over the past several decades (Stroeve and others, 2007). 
  23. ^ "Arctic Sea Ice Hits Smallest Extent In Satellite Era". National Aeronautics and Space Administration. 19 September 2012. Archived from the original on 4 February 2013. The new record minimum measures almost 300,000 square miles less than the previous lowest extent in the satellite record, set in mid-September 2007, of 1.61 million square miles (4.17 million square kilometers). For comparison, the state of Texas measures around 268,600 square miles. 
  24. ^ Ice Is 'Rotten' in the Beaufort Sea, ScienceDaily, 23 January 2010
  25. ^ Canadian Climate Normals 1971–2000.
  26. ^ Parsons, pp. 213–214
  27. ^ C. Michael Hogan (2008) ,, ed. N. StrombergPolar Bear: Ursus maritimus
  28. ^ Parsons, pp. 214–215
  29. ^ Parsons, pp. 218, 221
  30. ^ COSEWIC Assessment and Update Status Report on the Beluga Whale. (31 July 2012). Retrieved on 2013-03-21.
  31. ^ Cota, Glenn F. (1985). "Photoadaptation of high Arctic ice algae". Nature 315 (6016): 219.  
  32. ^ a b Parsons, pp. 215–217
  33. ^
  34. ^ Parsons, p. 222
  35. ^ Tuktoyaktuk – Statistical Profile.
  36. ^ a b Parsons, p. 233
  37. ^ a b Marlan W. Downey, William Andrew Morgan, Jack C. Threet, American Association of Petroleum Geologists Petroleum provinces of the twenty-first century, AAPG, 2001 ISBN 0-89181-355-1, p. 125
  38. ^ David L. VanderZwaag, Cynthia Lamson The Challenge of arctic shipping: science, environmental assessment, and human values, McGill-Queen's Press – MQUP, 1990 ISBN 0-7735-0700-0, p. 61


See also

Fishing and sea hunting are practised by the local inhabitants and have no commercial value, especially after a US moratorium on commercial fishing of the Beaufort Sea, adopted in 2009.[2] Trapping of muskrat at the Mackenzie River delta was the main source of income for the Athabaskan First Nations peoples and Inuit during 1920–1960, but has since declined.[19]

A major gas field, named Taglu field, was discovered in the Mackenzie River delta in 1971, followed by the Parson Lake field and Niglintgak field. The estimated gas reserves of these fields are 58,600 km3 (14,100 cu mi), 35,400 km3 (8,500 cu mi) and 13,600 km3 (3,300 cu mi), respectively. Moreover, further into the sea from the Mackenzie delta lies the Amauligak field. This, the largest known oil deposit of the Beaufort Sea, was discovered in 1984, and is estimated to contain 37.3 km3 (8.9 cu mi) of oil and 38,500 km3 (9,200 cu mi) of gas. The development of these fields is hindered by their remote location. This problem was alleviated for Prudhoe Bay by constructing the Trans-Alaska Pipeline, but is limiting regular commercial production at Mackenzie River deposits.[37] For example, the Amauligak Project was started soon after the discovery of the field. In September 1985, the tanker Gulf Beaufort has transported 50,300,000 l (316,377 bbl) of crude oil to Japan, which was the first shipment of oil from the Arctic deposits.[38] However, the project has stalled after that.

The Beaufort Sea contains major gas and petroleum reserves beneath the seabed, a continuation of proven reserves in the nearby Mackenzie River and North Slope.[15] The Beaufort Sea was first explored for sub-shelf hydrocarbons in the 1950s and estimated to contain about 250 km3 (60 cu mi) of oil and 300,000 km3 (72,000 cu mi) of natural gas under its coastal shelf. Offshore drilling began in 1972; about 70 wells were set up by the 1980s[36] and 200 wells by 2000.[37] These activities resulted in displacement of about 46.5 km3 (11.2 cu mi) of the sea bottom soil which contained barite, clay, caustic soda, as well as heavy metals zinc, copper, lead, chromium, cobalt, nickel, cadmium and mercury. About 50,400 km3 (12,100 cu mi) of oil was produced in 1986.[36]

The major settlements along the Beaufort Sea are Tuktoyaktuk (population 930 in 2009[35]) in Canada and Prudhoe Bay, Alaska. Although Prudhoe Bay is permanently populated by only a few people, there are thousands of contract workers in the area employed on petroleum production at the Prudhoe Bay Oil Field, which is on the coastal lowland known as the North Slope. Artificial islands, such as Endicott and Northstar, have been raised near the shores in 1987 and 2001, respectively. The crude oil is transported through the Trans-Alaska Pipeline System to the southern port of Valdez.[2]

Bowhead whales were hunted in the sea between 1888 and 1914. This practice stopped, first because of the decline in whale population and then because of government regulations, but resumed in the 1990s.[34]

"There is only one proposed Early-Entry site in eastern Beringia that still has proponents, Bluefish Caves in the Porcupine River Basin, Yukon Territory, Canada. Claims of great antiquity in the area [e.g., 30kya] have a convoluted history. A caribou tibia flesher, the most diagnostic human implement from the Old Crow basin, had been dated at near 28 kya. When redated using accelerator mass spectrometry (AMS) of small amounts of remnant collagen the bone produced a 1.8 kya date (Yesner 1996b:255)".[33] There is no evidence for anomalous occupation of Beaufort coasts in the context of Arctic cultures generally, including the arrival about 4,000 years ago by Paleo-Eskimos such as the Dorset culture, around 1,000 years ago by the Thule and finally by the modern Inuit. From early ages, they practised fishing – bones of Arctic char were found at the 4,000 years old settlements. While originally they lived nomadic life, later, they started to form permanent settlements. Modern Inuit are mostly concentrated near the Mackenzie River delta. Their population is increasing, but the unemployment rate is relatively high.[32]

A map showing the Trans-Alaska Pipeline colored in red.

Human activities

The food chain of the Beaufort Sea is relatively simple: It starts with phytoplankton and epontic algae (single-cell algae associated with the lower interface of sea ice[31]), which provide energy to zooplankton, and epontic and coastal amphipods. The latter serve as a food for sea birds and fish, primarily as polar cod and Arctic char. Polar cod is a major food of Arctic char, beluga, narwhal, sea birds and seals, which are dominated by the Bearded Seal (Erignatus barbatus) and Ringed Seal (Pusa hispida). Bearded seal and walrus also feed on benthic invertebrates. On top of the food pyramid stands polar bear, which feeds primarily on seals, but also on any large marine mammals when it has a chance, such as carcasses and whales trapped in ice fields.[32]

The eastern part of the sea is a major habitat of beluga whales with an estimated population of 39,000. This population is stable and might even be increasing; it is not affected by the offshore oil exploration in the area. Belugas spend summer in the coastal area and Mackenzie River delta, which are free of ice then, and in winter migrate log distances to the polynyas of the deep sea. Genetic analyses have confirmed that belugas of the Beaufort Sea are clearly distinct from those of other Canadian and Alaskan waters, despite they often share a common wintering habitat.[30]

The sea hosts about 80 species of zooplankton, more than 70 species of phytoplankton, and nearly 700 species of polychaetes, bryozoans, crustaceans and mollusks, but their total volume is relatively small owing to the cold climate.[2][28] Major fish species include polar cod (Boreogadus saida), Arctic cod (Arctogadus glacialis), saffron cod (Eleginus gracilis), Arctic char (Salvelinus alpinus), chum salmon (Oncorhynchus keta), Arctic cisco (Coregonus autumnalis), least cisco (Coregonus sardinella), lake whitefish (Coregonus clupeaformis), broad whitefish (Coregonus nasus), Pacific herring (Clupea pallasii), fourhorn sculpin (Myoxocephalus quadricornis), inconnu (Stenodus leucichthys) and flatfish.[29]

The shoreline of the Beaufort Sea is covered with tundra and the northern limit of the terrestrial range of the polar bear in North America. The Mackenzie River is an important habitat for whales and sea birds and is still relatively untouched by commercial traffic.[27] The delta of Mackenzie River contains numerous lakes and ponds which are inhabited by muskrat.[19]

Flora and fauna

The water currents form the clockwise-directed Beaufort Gyre, that results in south-westerly and westerly currents near the shores.[26] The Mackenzie River partly affects this circulation inducing minor eastwards streams near its mouth. The river annually brings about 15 million tonnes of sediments which are rich in dolomite and calcium carbonate. Those deposits are spread over the sea and mixed with mud and gravel.[2]

Northstar Island, an artificial island northwest of Prudhoe Bay, is a site of oil and gas drilling

The sea water has a stable temperature and is separated into four distinct layers as follows. The top 100 m (330 ft) are surface water which has a temperature of −1.4 °C (29.5 °F) in summer and −1.8 °C (28.8 °F) in winter. The next layer is formed by the inflows from the Pacific Ocean and Bering Sea coming through the Bering Strait; it extends up to the North Pole. The warmest, deep Atlantic layer has the temperatures between 0 and 1 °C (32 to 34 °F), and water at the bottom is a bit colder at −0.4 to −0.8 °C (31.3 to 30.6 °F).[2] The average salinity varies between 28‰ and 32‰ (parts per thousand) from south to north.[1] Typical air temperatures (at Tuktoyaktuk) are −27 °C (−17 °F) in January and 11 °C (52 °F) in July.[25]

Hidden changes in the ice cover of the Beaufort Sea were discovered in 2009. Whereas the ice area remain stable, as detected by the observation satellites, so as the associated water temperature and salinity, the ice structure has changed recently. The new ice, called rotten ice, is thinner and much weaker structurally.[24]

The channels of the Mackenzie River thaw earlier, in late May–early June. This thawing increases the average water discharge from about 150,000 to 250,000 m3/s (5,300,000 to 8,800,000 cu ft/s).[19]

The Beaufort Sea is frozen over through the year, except for August and September when the ice breaks near the coast and opens what was once a 50–100 km (31–62 mi) wide strip of open water.[1] During the 2000s, due to climate change in the Arctic, the ice-free area in late summer greatly enlarged. During the record minimum extent of Arctic sea ice in September, 2012, the sea ice boundary had retreated northward much farther than normal from the coast.[20][21][22][23]

Sea ice pressure ridges in the Beaufort Sea off the northern coast of Alaska (Spring, 1949).

Hydrology and climate

Several rivers such as the Kongakut River in Alaska and the Firth River in Yukon empty into the Beaufort. The major river to flow into the sea is the Mackenzie, Canada's longest, which empties into the Canadian part of the sea, west of Tuktoyaktuk. The coastal shelf area is rather narrow, especially near and east of Point Barrow in the Alaskan part of the sea, and contains numerous submarine valleys. It becomes wider near the delta of the Mackenzie River but nowhere exceeds 145 km (90 mi). Near the coast, the depths are shallower than 60 m (200 ft) but they rapidly increase northwards up to a few kilometers, transforming into a massive platform which is geologically similar to that of the oceans. There are many small islands in the sea and in the delta of the Mackenzie River. A few larger ones lie west of the Mackenzie River, such as Herschel Island (4 km (2.5 mi) off the shore, area 18 km2 (6.9 sq mi)) and Barter Island (0.3 km (0.19 mi) from the coast, area 13 km2 (5.0 sq mi)). The coasts are low, with the maximum elevations between 250 and 750 m (820 and 2,460 ft).[2] The soil is frozen all year around at the depth below about 1 m (3 ft 3 in) or less, forming permafrost, and only top few tens centimeters thaws in summer. Consequently, buildings have to be elevated above ground on wooden piles that are immersed into the permafrost.[19]

Topography of the Beaufort Sea area.


Before the end of 2004, the US leased eight plots of land below the water for oil exploration and exploitation, provoking a diplomatic protest from Canada.[15] On 20 August 2009, United States Secretary of Commerce Gary Locke announced a moratorium on commercial fishing of the Beaufort Sea north of Alaska, including the disputed waters.[16][17] In July 2010, US-Canada negotiations have started in Ottawa with the next meeting planned in 2011. A joint geological survey of the area has been initiated, and the issue was marked as settled by the CIA World Factbook,[18] though no official document has been released by September 2010.

Canada maintains that this treaty is extensible from the land into the Beaufort Sea along the meridian. The United States rejects this extension and instead asserts a boundary line based upon equidistance, although its position is somewhat undermined by its acceptance in 1867 of similar treaty wording and a similar interpretation under the treaty whereby it acquired Alaska.[9] Both the U.S. and Canada agree that they are bound by the 1958 Convention on the Continental Shelf; and they both agree that the boundary should be "equitable", as determined by the International Court of Justice. They differ on what should be deemed "equitable". The U.S. contends that "equidistance is an appropriate principle for determining a maritime boundary where there are no special circumstances in the area and when equidistance results in a boundary in accordance with equitable principles". Canada contends that an equidistance principle does not result in an equitable boundary, because distortion would occur. The coast of Yukon is concave, whereas the coast of Alaska is convex; and thus an equidistance principle would result in a significant extension of the U.S. possession.[12] This dispute has taken on increased significance due to the possible presence of natural reserves within the wedge,[9][13][14] which according to Canada's National Energy Board may contain 1,700,000,000 m3 (6.0×1010 cu ft) of gas, which would cover the national consumption for 20 years, and more than 1,000,000,000 m3 (3.5×1010 cu ft) of oil.[11] Because of this, Canada argues that "special circumstances" apply to this border, a position that the U.S. rejects.[12] This dispute is in this respect a mirror image of the dispute between the U.S. and Canada over the Gulf of Maine, where the U.S. argued for "special circumstances" and Canada argued for the equidistance principle.[12] (It is to be noted that in that latter dispute, both of those arguments were rejected, and the border was drawn based upon geometric principles taking into account geographic factors.[12]) Neither the U.S. nor Canada have pressed for a swift resolution for the matter, or arbitration at the International Court of Justice, however;[9] and the two have in the meantime cooperated in several measures aimed at preserving the maritime environment.[9][12]

the line of demarcation shall follow the summit of the mountains situated parallel to the Coast, as far as the point of intersection of the 141st degree of West longitude [...] and, finally, from the said point of intersection, the said Meridian Line of the 141st degree, in its prolongation as far as the Frozen Ocean
— Article 3, Convention between Great Britain and Russia concerning the Limits of their Respective Possessions on the North-West Coast of America and the Navigation of the Pacific Ocean, 1825-02-16, 75 CTS 95[9]

Canada's position has its roots in the Treaty of Saint Petersburg (1825) between the United Kingdom and the Russian Empire that set the boundary between the two. Canada is the successor state to Great Britain in relation to this treaty, which stipulates:[9]

There is an unresolved dispute involving a wedge-shaped slice on the International Boundary in the Beaufort Sea, between the Canadian territory of Yukon and the U.S. state of Alaska. Canada claims the maritime boundary to be along the 141st meridian west out to a distance of 200 nmi (370 km; 230 mi), following the Alaska-Yukon land border.[8][9] The position of the United States is that the boundary line is perpendicular to the coast out to a distance of 200 nmi (370 km; 230 mi), following a line of equidistance from the coast.[9][10] This difference creates a wedge with an area of about 21,000 km2 (8,100 sq mi) that is claimed by both nations.[11]

The cross-hatched wedge-shaped region in the east is claimed by both Canada and the US

Border dispute

On the North. A line from Point Barrow, Alaska, to Lands End, Prince Patrick Island (). On the East. From Lands End through the Southwest coast of Prince Patrick Island to Griffiths Point, thence a line to Cape Prince Alfred, the Northwestern extreme of Banks Island, through its West coast to Cape Kellet, the Southwestern point, and thence a line to Cape Bathurst on the mainland ().


This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Hawaii eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.