South Shetland Islands


The South Shetland Islands are a group of Antarctic islands with a total area of. They lie about north of the Antarctic Peninsula, and between to south-west from the nearest point of the South Orkney Islands. 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 as part of the British Antarctic Territory since 1962. They are also claimed by the governments of Chile and by Argentina.
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.

History

The islands were discovered by the British mariner William Smith in 1819. Although it has been postulated that Dutch mariner Dirck Gerritsz in 1599 or Spanish Admiral Gabriel de Castilla in 1603 might have sighted the South Shetlands, or North or South American sealers might have visited the archipelago before Smith, there is insufficient historical evidence to sustain such assertions. Smith's discovery, by contrast, was well documented and had wider historical implications beyond its geographic significance.
Chilean scientists have claimed that Amerinds 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. 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 Valparaíso, 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 farther than 60° south. 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. The crew of San Telmo, led by brigadier Rosendo Porlier, is believed to be the first known humans to land in Antarctica.
From December 1819 to January 1820, the islands were surveyed and mapped by Lieutenant Edward Bransfield on board the Williams, which had been chartered by the Royal Navy.
On 15 November 1819 the United States agent in Valparaíso, Jeremy Robinson, informed the US Secretary of State John Quincy Adams of Smith's discovery and Bransfield's forthcoming mission, and suggested dispatching a US Navy ship to explore the islands where "new sources of wealth, power and happiness would be disclosed and science itself be benefited thereby."
The discovery of the islands attracted British and American sealers. The first sealing ship to operate in the area was the brig Espirito Santo, chartered by British merchants in Buenos Aires. The ship arrived at Rugged Island off Livingston Island, where its British crew landed on Christmas Day 1819, and claimed the islands for King George III. A narrative of the events was published by the brig's master, Joseph Herring, in the July 1820 edition of the Imperial Magazine. The Espirito Santo was followed from the Falkland Islands by the American brig Hersilia, commanded by Captain James Sheffield, the first US sealer in the South Shetlands.
The first wintering over in Antarctica took place on the South Shetlands, when at the end of the 1820–21 summer season eleven British men from the ship Lord Melville failed to leave King George Island, and survived the winter to be rescued at the beginning of the next season.
Having circumnavigated the Antarctic continent, the Russian Antarctic expedition of Fabian von Bellingshausen and Mikhail Lazarev arrived at the South Shetlands in January 1821. The Russians surveyed the islands and named them, landing on both King George Island and Elephant Island. While sailing between Deception and Livingston islands, Bellingshausen was visited by Nathaniel Palmer, master of the American brig Hero, who informed him of the activities of dozens of American and British sealing ships in the area.
The name "New South Britain" was used briefly, but was soon changed to South Shetland Islands. The name South Shetland Islands is now established in international usage. Both island groups lie at similar distances from the equator, but the South Shetlands are much colder.
Seal hunting and whaling was conducted on the islands during the 19th and early 20th century. The sealing era lasted from 1820 to 1908 during which time 197 vessels are recorded visiting the islands. Twelve of those vessels were wrecked. Relics of the sealing era include iron try-pots, hut ruins and inscriptions.
Beginning in 1908, the islands were governed as part of the Falkland Islands Dependency, but they have only been permanently occupied by humans since the establishment of a scientific research station in 1944. The archipelago, together with the nearby Antarctic Peninsula and South Georgia Island, is an increasingly popular tourist destination during the southern summer.

Geography

As a group of islands, the South Shetland Islands are located at. They are within the region 61° 00'–63° 37' South, 53° 83'–62° 83' West. The islands lie south of the Falkland Islands, and between and 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 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 above sea level.
The South Shetland Islands extend about from Smith Island and Low Island in the west-southwest to Elephant Island and Clarence Island in the east-northeast.

Volcanoes

Various volcanoes with activity in the Quaternary exist in the islands. These volcanoes are associated with the tectonics of Bransfield Rift. From west to east known volcanoes are Sail Rock, Deception Island, Rezen Knoll, Gleaner Heights, Edinburgh Hill, Inott Point, Penguin Island, Melville Peak and Bridgeman Island. Most of the volcanic rock and tephra is of basalt or basaltic andesite. An exception is the tephra of Deception Island which is of trachyte and basaltic trachyandesite, richer in potassium and sodium.
Quaternary volcanic products of the islands tend to have less potassium and sodium at a given silica range, and lower Nb/Y ratios, than those associated with the Larsen Rift on the Antarctic Peninisula.

Climate

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 for eight months of the year.
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 and those in winter are about. The effect of the ocean tends to keep summer temperatures low and prevent winter temperatures from falling as low as they do inland to the south.

Flora and fauna

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.

Diptera

From north to south the main and some minor islands of the South Shetlands are:
The Russian names above are historical, and no longer the official Russian names.

Research stations

Several nations maintain research stations on the Islands: