South Orkney Islands

Signy Island base and panorama

Map of the South Orkney Islands
Geography
Location Antarctica
Coordinates 60°35′S 45°30′W / 60.583°S 45.500°W / -60.583; -45.500
Area 620 km2 (240 sq mi)
Highest elevation 4,153 ft (1,265.8 m)
Administration
Administered under the Antarctic Treaty System
Demographics
Population 0

The South Orkney Islands are a group of islands in the Southern Ocean, about 604 kilometres (375 mi) north-east of the tip of the Antarctic Peninsula.[1] They have a total area of about 620 square kilometres (240 sq mi). The islands are claimed both by Britain (as part of the British Antarctic Territory since 1962, previously as a Falkland Islands Dependency), and by Argentina as part of Argentine Antarctica. Under the 1959 Antarctic Treaty, sovereignty claims are held in abeyance.

Britain and Argentina both maintain bases on the islands. The Argentinian base, Orcadas, established 1904, is sited on Laurie Island. The 11 buildings of the Argentinian station house up to 45 people during the summer, and an average of 14 during winter. The British Antarctic Survey base, Signy Research Station, is located on Signy Island and was established in 1947. Apart from personnel at the bases, there are no inhabitants on the islands.

History

Signy Island base

The South Orkney Islands were discovered in 1821 by two sealers, the American Nathaniel Brown Palmer and the British George Powell. The Islands were originally named Powell's Group, with the main island named Coronation Island as it was the year of the coronation of King George IV. In 1823, James Weddell visited the Islands, gave the archipelago its present name (after the Orkney Islands, Scotland) and also renamed some of the islands. The South Orkney Islands are located at roughly the same latitude south as the Orkney Islands are north (60°S vs 59°N), although it is not known if this was a factor behind the naming of the islands.

Subsequently, the islands were frequently visited by sealers and whalers, but no thorough survey was done until the expedition of William Speirs Bruce on the Scotia in 1903, which overwintered at Laurie Island. Bruce surveyed the islands, reverted some of Weddell's name changes, and established a meteorological station, which was sold to the Argentinian Government upon his departure in 1904. This base, renamed Orcadas in 1951, is still in operation today and is thus the oldest research station continuously staffed in the Antarctic.

A 1944 stamp of the Falkland Islands overprinted for use in the South Orkneys.

In 1908, the United Kingdom declared sovereignty over various Antarctic and South American territories "to the south of the 50th parallel of south latitude, and lying between the 20th and the 80th degrees of west longitude", including the South Orkney Islands.[2] The Islands were subsequently administered as part of the Falkland Islands Dependencies. A biological research station on Signy Island was built in 1947 by the British Antarctic Survey. In 1962, the islands became part of the newly established British Antarctic Territory.

The Argentinian claim to the islands dates from 1925. It was originally justified by the Argentinian occupation of the Laurie Island base and later subsumed into a wider territorial claim.[3]

Geography and climate

Average air temperature readings of 1901 to 2007; NASA.

The islands are situated at latitudes about 60°30' to 60°83' S and longitudes 44°25' to 46°25' W in the Southern Ocean. As a group of islands, the South Orkney Islands are at approximately 60°35′S 045°30′W / 60.583°S 45.500°W / -60.583; -45.500.

Coordinates: 60°35′S 45°30′W / 60.583°S 45.500°W / -60.583; -45.500

The archipelago comprises four main islands. Coronation Island is the largest, measuring about 30 miles (48 km) long; its highest point is Mount Nivea which rises to 4,153 feet (1,266 m) above sea level. Laurie Island is the easternmost of the islands. The other main islands are Powell and Signy. Smaller islands in the group include Robertson Islands, the Saddle Islands, and Acuña Island. The total area of the archipelago is about 240 square miles (620 km2), of which about 90 percent is glaciated.[1]

The Inaccessible Islands about 15 nmi (17 mi; 28 km) to the west are considered part of the South Orkneys.

The climate of the South Orkneys is generally cold, wet, and windy. Summers are short and cold (December to March) when the average temperatures reach about 3.5 °C (38.3 °F) and fall to about −12.8 °C (9 °F) in July. The all time temperature range is between 12 and −44 °C (53.6 and −47.2 °F). The seas around the islands are ice-covered from late April to November.

Despite the harsh conditions the islands do support vegetation and are part of the Scotia Sea Islands tundra ecoregion, along with South Georgia and the South Sandwich Islands, the South Shetland Islands and Bouvet Island. All these islands lie in the cold seas below the Antarctic convergence. These areas support tundra vegetation consisting of mosses, lichens and algae, while seabirds, penguins and seals feed in the surrounding waters.

South Orkney Trough (60°0′S 45°0′W / 60.000°S 45.000°W / -60.000; -45.000) is an undersea trough named in association with the South Orkney Islands and approved 10/77 (ACUF 177).

Research stations

Orcadas Base

The two claimant nations maintain research stations on the islands.

See also

References

  1. 1 2 Antarctica: Secrets of the Southern Continent p. 122, David McGonigal, 2009
  2. ↑ International law for Antarctica p. 652, Francesco Francioni and Tullio Scovazzi, 1996
  3. ↑ Exploring polar frontiers: a historical encyclopedia, Volume 2, pp. 34–35, William James Mills, 2003

External links

Wikimedia Commons has media related to South Orkney Islands.
Wikivoyage has a travel guide for South Orkney Islands.
This article is issued from Wikipedia - version of the Tuesday, March 01, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.