South Shetland Islands, Drake Passage, South Pole

• published: 15 Aug 2011
• views: 1443

The South Shetland Islands are a group of Antarctic islands, lying about 120 kilometres (75 mi) north of the Antarctic Peninsula, with a total area of 3,687 square kilometres (1,424 sq mi). By the Antarctic Treaty of 1959, the islands' sovereignty is neither recognized nor disputed by the signatories and they are free for use by any signatory for non-military purposes. The islands have been claimed by the United Kingdom since 1908 and to be part of the British Antarctic Territory since 1962. They are also claimed by the governments of Chile (since 1940, as part of the Antártica Chilena Province) and by Argentina (since 1943, as part of Argentine Antarctica, Tierra del Fuego Province). Several countries maintain research stations on the islands. Most of them are situated on King George Island, benefitting from the airfield of the Chilean base Eduardo Frei. There are sixteen research stations to date in different parts of the islands, with Chilean stations being the greatest in number. Research is often a shared duty of nations, with the Chilean-United States Shirreff Base being one example. As a group of islands, the South Shetland Islands are located at 62°0′S 58°0′WCoordinates: 62°0′S 58°0′W. They are within the region 61° 00'–63° 37' South, 53° 83'–62° 83' West. The islands lie 940 km (580 mi) south of the Falkland Islands, and between 93 km (58 mi) (Deception Island) and 269 km (167 mi) (Clarence Island) northwest and north from the nearest point of the Antarctic continent, Graham Land. The South Shetlands consist of 11 major islands and several minor ones, totalling 3,687 square kilometres (1,424 sq mi) of land area. Between 80 and 90 percent of the land area is permanently glaciated. The highest point on the island chain is Mount Irving on Clarence Island at 2,300 metres (7,546 ft) above sea level. The South Shetland Islands extend about 450 km (280 mi) from Smith Island and Snow Island in the west-southwest to Elephant Island and Clarence Island in the east-northeast. The islands are the same distance from the equator as the Faroe islands in the north Atlantic but their proximity to Antarctica means that they have a much colder climate. The sea around the islands is closed by ice from early April to early December and the monthly average temperature is below 0 °C (32 °F) for eight months of the year (April to November). The islands have experienced measurable glacier retreat during recent years but despite this they remain more than 80% snow and ice covered throughout the summer. The climate is cloudy and humid all year round and very strong westerly winds blow at all seasons. Some of the sunniest weather is associated with outbreaks of very cold weather from the south in late winter and spring. Mean summer temperatures are only about 1.5 °C (34.7 °F) and those in winter are about −5 °C (23 °F). The effect of the ocean tends to keep summer temperatures low and winter temperatures from decreasing as low as they do inland to the south. 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 Orkney 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. Chilean scientists have claimed that Amerind visited the islands, due to stone artifacts recovered from bottom-sampling operations in Admiralty Bay, King George Island and Discovery Bay, Greenwich Island; however, the artifacts two arrowheads were later found to have been planted. The Dutchman Dirck Gerritsz in 1599, or the Spaniard Gabriel de Castilla in 1603, supposedly sailed south of the Drake Passage in the South Shetland Islands area. In 1818 Juan Pedro de Aguirre obtained permission from the Buenos Aires authorities to establish a base for sealing on "some of the uninhabited islands near the South Pole". Captain William Smith in the British merchant brig Williams, while sailing to Valparaiso, Chile in 1819 deviated from his route south of Cape Horn, and on 19 February sighted Williams Point, the northeast extremity of Livingston Island. Thus Livingston Island became the first land ever discovered south of the 60th southern latitude. Smith revisited the South Shetlands, landed on King George Island on 16 October 1819, and claimed possession for Britain. Meanwhile, the Spanish Navy ship San Telmo sank in September 1819 whilst trying to go through the Drake Passage. Parts of her presumed wreckage were found months later by sealers on the north coast of Livingston Island.