New Siberian Islands

New Siberian Islands
Native name: Новосиби́рские острова

Location of the New Siberian Islands
New Siberian Islands
New Siberian Islands (Russia)
Geography
Location between the Laptev Sea and East Siberian Sea
Coordinates 75°16′N 145°15′E / 75.267°N 145.250°E / 75.267; 145.250Coordinates: 75°16′N 145°15′E / 75.267°N 145.250°E / 75.267; 145.250
Archipelago New Siberian Islands
Area 29,900 km2 (11,500 sq mi)
Highest elevation 374 m (1,227 ft)
Highest point Malakatyn Tas
Administration
Federal subject Sakha Republic (Yakutia)
Demographics
Population Uninhabited

The New Siberian Islands (Russian: Новосиби́рские острова, Novosibirskiye Ostrova) are an archipelago in the Extreme North of Russia, to the North of the East Siberian coast between the Laptev Sea and the East Siberian Sea north of the Sakha (Yakutia) Republic.

History

Map of the New Siberian Islands (Philippe Vandermaelen "Map of the Asian Russia", ca.1820). Bunge Land was not discovered yet so Faddeyevsky Island and Kotelny Island were considered separately.

The first news about the existence of the New Siberian Islands was brought by a Cossack, Yakov Permyakov, in the beginning of the 18th century. In 1712, a Cossack unit led by M. Vagin reached the Great Lyakhovsky Island. At the beginning of the 19th century, the islands were further explored by Yakov Sannikov, Matvei Gedenschtrom and others.[1]

In 1809–10 Yakov Sannikov and Matvei Gedenschtrom went to the New Siberian Islands on a cartographic expedition. Yakov Sannikov reported the sighting of a "new land" north of Kotelny in 1811. This became the myth of Zemlya Sannikova or Sannikov Land.[1]

In 1886 Eduard von Toll, during his first visit to the New Siberian Islands, thought that he had seen an unknown land north of Kotelny Island. He guessed that this was the so-called Zemlya Sannikova.[1]

Polar explorer and scientist Eduard Toll paid a further visit to this island group in the spring of 1892, accompanied only by one Cossack and three natives. He traveled over the ice in sleds drawn by dogs and reached the south coast of Great Lyakhovsky Island.[1] Along the southern coast of this island he found well-preserved bones, ivory, peat, wood, and even a tree within 40-meter (130-foot) high sea cliffs that expose Late Pleistocene sediments. These sediments are cemented by permafrost and have accumulated periodically over the last 200,000 years.[2][3][4]

In September 2014, the Russian Navy re-established a Soviet era naval base which had laid abandoned since 1993.[5]

Geography

Location of the New Siberian Islands within Russia.

The New Siberian Islands proper, or Anzhu Islands (острова Анжу, Sakha: Анжу арыылара), covering a land area of about 29,000 km², consist of:

To the south and nearer to the Siberian mainland lie the Lyakhovskiye Islands (6,095 km²):

The small De Long Islands (228 km²) lie to the north-east of Novaya Sibir.

The New Siberian Islands are low-lying. Their highest point is Mt. Malakatyn-Tas on Kotelny island, with an elevation of 374 m.

The New Siberian Islands once formed major hills within the Great Arctic Plain that covered the northern part of Late Pleistocene "Beringia" between Siberia and Alaska during the Last Glacial Maximum (Late Weichselian Epoch). These islands represent the remains of about 1.6 million square kilometers of the formerly subaerial Great Arctic Plain that now lies submerged below parts of the Arctic Ocean, East Siberian Sea, and Laptev Sea. At this plain's greatest extent, sea level was 100–120 m below modern sea-level and the coastline lay 700 to 1000 kilometers north of its current position. This plain did not undergo extensive glaciation during the Late Pleistocene or the Last Glacial Maximum because it lay in the rain shadow of the Northern European ice sheet. During the frigid polar climate of the Last Glacial Maximum, 17,000 to 24,000 BC, small passive ice caps formed on the adjacent De Long Islands. Fragments of these ice caps remain on Jeannette, Henrietta, and Bennett Islands. Traces of former small slope and cirque glaciers in the form of buried ground ice deposits are preserved on Zhokhov Island. The sea submerged the Great Arctic Plain (except for the New Siberian and other isolated islands) within a relatively short time span of 7,000 years during the Early–Middle Holocene.[6][7][8]

Geology

As noted by Digby[9] and numerous later publications, this archipelago consists of a mixture of folded and faulted sedimentary and igneous rocks ranging in age from Precambrian to Pliocene. The Lyakhovsky Islands consist of a folded and faulted assemblage of Precambrian metamorphic rocks; upper Paleozoic to Triassic sandstones and shales; Jurassic to lower Cretaceous turbidites; Cretaceous granites; and ophiolites. The Anzhu Islands consist of a highly faulted and folded assemblage of Ordovician to Devonian limestones, dolomites, sandstones, shales, volcanoclastic strata, and igneous rocks; upper Paleozoic to Triassic sandstones and shales; Jurassic to lower Cretaceous turbidites; and upper Cretaceous to Pliocene sandstones and shales. The De Long Islands consist of early Paleozoic, middle Paleozoic, Cretaceous, and Neogene sedimentary and igneous (mostly basalt) rocks. These sedimentary, metamorphic, and igneous rocks are mantled by loose Pleistocene and Holocene sediments that range in thickness from a fraction of a meter to about 35 meters (115 feet).[10][11]

Digby[9] also noted that some early papers published about the New Siberian Islands incorrectly describe them, often along with other Arctic islands (e.g. Wrangel Island), as being made either up almost entirely of mammoth bones and tusks or of ice, sand, and the bones of mammoths and other extinct megafauna. Some of these papers were written by persons (e.g. D. Gath Whitley),[12] who had never visited the New Siberian Islands and relied upon anecdotes of traders and travelers and local folklore for their descriptions of them, and other articles were written by explorers and ivory hunters untrained in either geology or other sciences. Such statements have been shown to be fictional in nature by detailed studies of the geology of the New Siberian Islands by professional geologists, paleontologists, and other scientists.[2][3][10][11][13][14]

Ivory deposits

As noted by Baron Eduard V. Toll[15] in his account of the New Siberian Islands, sizable and economically significant accumulations of fossil ivory occur within them. The ivory, along with mammoth and other bones, are found in recent beaches, drainage areas, river terraces and river beds. The New Siberian Islands are unique in the burial and preservation of fossil ivory "...in such a wonderful state of preservation that the tusks so found cannot be distinguished from the very best and purest ivory." The abundant bones, even skeletons, of mammoth, rhinoceros, musk-ox, and other megafauna along with the mammoth ivory found in these islands are preserved by permafrost, in which they are encased. The permafrost periodically developed in Late Pleistocene loess, solifluction, pond, and stream sediments as they accumulated. The radiocarbon dating of bones, ivory, and plants; optically stimulated luminescence dating of enclosing sediments; and uranium-thorium dating of associated peats demonstrate that the bones and ivory, which are found within some of the New Siberian Islands, accumulated over a period of some 200,000 years. Radiocarbon dates obtained from the collagen of 87 mammoth tusks and bones collected from Faddeevsky, Kotelniy, and New Siberia islands ranged from 9470±40 BP to greater than 50,000 BP (14C).[16] Their "wonderful state of preservation" is the result of them having been frozen in permafrost since their burial.[2][10][13][17]

Climate

The climate is arctic and severe. Snow cover is present for 9 months of the year.

Permafrost and underground ice are very common. The surface of the islands is covered with Arctic tundra vegetation and numerous lakes.

The ocean surrounding the islands is covered with ice most of the year. During warm years, the ocean briefly opens for navigation July through October. During cold years, islands may remain ice-locked through the summer.

Polar night conditions are present November through February, and, conversely, the Sun remains above the horizon continuously during summer months.

Climate data for Kotelny Island
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °C (°F) −7.2
(19)		 −3.3
(26.1)		 −4.8
(23.4)		 0.3
(32.5)		 6.2
(43.2)		 20.7
(69.3)		 25.1
(77.2)		 20.2
(68.4)		 11.8
(53.2)		 1.8
(35.2)		 −2.5
(27.5)		 −3.1
(26.4)		 25.1
(77.2)
Average high °C (°F) −26.1
(−15)		 −26.4
(−15.5)		 −24.2
(−11.6)		 −16.9
(1.6)		 −6.2
(20.8)		 1.4
(34.5)		 5.7
(42.3)		 4.3
(39.7)		 0.3
(32.5)		 −8.1
(17.4)		 −18.2
(−0.8)		 −23.8
(−10.8)		 −11.5
(11.3)
Daily mean °C (°F) −29.3
(−20.7)		 −29.7
(−21.5)		 −27.5
(−17.5)		 −20.3
(−4.5)		 −8.6
(16.5)		 −0.4
(31.3)		 2.9
(37.2)		 2.1
(35.8)		 −1.2
(29.8)		 −10.7
(12.7)		 −21.5
(−6.7)		 −27.0
(−16.6)		 −14.3
(6.3)
Average low °C (°F) −32.6
(−26.7)		 −32.9
(−27.2)		 −30.9
(−23.6)		 −24.2
(−11.6)		 −11.4
(11.5)		 −2.1
(28.2)		 0.6
(33.1)		 0.2
(32.4)		 −3.0
(26.6)		 −13.7
(7.3)		 −24.8
(−12.6)		 −30.3
(−22.5)		 −17.1
(1.2)
Record low °C (°F) −44.9
(−48.8)		 −49.9
(−57.8)		 −46.1
(−51)		 −46.2
(−51.2)		 −28.6
(−19.5)		 −14.9
(5.2)		 −6.0
(21.2)		 −9.2
(15.4)		 −18.6
(−1.5)		 −40.2
(−40.4)		 −40.2
(−40.4)		 −45.0
(−49)		 −49.9
(−57.8)
Average precipitation mm (inches) 7
(0.28)		 5
(0.2)		 6
(0.24)		 8
(0.31)		 9
(0.35)		 17
(0.67)		 26
(1.02)		 23
(0.91)		 23
(0.91)		 16
(0.63)		 7
(0.28)		 7
(0.28)		 154
(6.06)
Average rainy days 0 0 0 0.1 1 8 15 15 9 0.4 0 0 49
Average snowy days 15 16 16 15 22 16 8 11 22 26 18 16 201
Average relative humidity (%) 82 82 82 83 87 90 90 91 90 88 84 82 86
Mean monthly sunshine hours 0 7 147 283 197 178 168 100 44 14 0 0 1,138
Source #1: Pogoda.ru.net[18]
Source #2: NOAA (sun 1961–1990)[19]

See also

References

  1. 1 2 3 4 Markham, Albert Hastings Arctic Exploration, 1895
  2. 1 2 3 Andreev, A.A., G. Grosse, L. Schirrmeister, S.A. Kuzmina, E. Y. Novenko, A.A. Bobrov, P.E. Tarasov, B.P. Ilyashuk, T.V. Kuznetsova, M. Krbetschek, H. Meyer, and V.V. Kunitsky, 2004, Late Saalian and Eemian palaeoenvironmental history of the Bol’shoy Lyakhovsky Island (Laptev Sea region, Arctic Siberia), 3.41 MB PDF file, Boreas. vol. 33, pp. 319–348.
  3. 1 2 Romanovsky, N.N., 1958, New data about the construction of Quaternary deposits on Bol’shoy Lyakhovsky Island (Novosibirsky Islands). Science College Report, Geological-Geographical Serie no. 2, pp. 243–248. (in Russian)
  4. ↑ Schirrmeister, L., 2002, 230Th/U Dating of Frozen Peat, Bol’shoy LyakhovskyIsland (Northern Siberia). Quaternary Research, vol. 57, pp. 253–258
  5. ↑ "Russia dispatches naval force to reopen Arctic base". Daily Telegraph. Retrieved 7 September 2014.
  6. ↑ Alekseev, M.N., 1997, Paleogeography and geochronology in the Russian eastern Arctic during the second half of the Quaternary. Quaternary International. vol. 41-42, pp. 11-15.
  7. ↑ Anisimov, M.A., and V.E. Tumskoy, 2002, Environmental History of the Novosibirskie Islands for the last 12 ka. 32nd International Arctic Workshop, Program and Abstracts 2002. Institute of Arctic and Alpine Research, University of Colorado at Boulder, pp 23-25.
  8. ↑ Schirrmeister, L., H.-W. Hubberten, V. Rachold, and V.G. Grosse, 2005, Lost world - Late Quaternary environment of periglacial Arctic shelves and coastal lowlands in NE-Siberia. 2nd International Alfred Wegener Symposium Bremerhaven, October, 30 - November 2, 2005.
  9. 1 2 Digby, B., 1926, The Mammoth and Mammoth-Hunting in North-East Siberia. D. Appleton and Company: New York, 224 pp.
  10. 1 2 3 Dorofeev, V.K., M.G. Blagoveshchensky, A.N. Smirnov, and V.I. Ushakov, 1999, New Siberian Islands. Geological structure and metallgeny. VNIIOkeangeologia, St. Petersburg, Russia. 130 pp. (in Russian)
  11. 1 2 Kos'ko, M.K., and G.V. Trufanov, 2002, Middle Cretaceous to Eopleistocene Sequences on the New Siberian Islands: an approach to interpret offshore seismic. Marine and Petroleum Geology. vol. 19, no. 7, pp. 901-919.
  12. ↑ Whitley, D.G., 1910, The Ivory Islands of the Arctic Ocean Journal of the Transactions of the Victoria Institute. vol. XLII, pp. 35-57
  13. 1 2 Makeyev, V.M., D.P. Ponomareva, V.V. Pitulko, G.M. Chernova and D.V. Solovyeva, 2003, Vegetation and Climate of the New Siberian Islands for the past 15,000 Years. Arctic, Antarctic, and Alpine Research, vol. 35, no. 1, pp. 56-66.
  14. ↑ Meyer, H., A. Dereviagin, C. Siegert, L. Schirrmeister and H.-W. Hubberten, 2002, Palaeoclimate Reconstruction on Big Lyakhovsky Island, North Siberia—Hydrogen and Oxygen Isotopes in Ice Wedges. Permafrost and Periglacial Processes. vol. 13, pp. 91-105.
  15. ↑ von Toll, Baron E., 1895, Wissenschaftliche Resultate der Von der Kaiserlichen Akademie der Wissenschaften sur Erforschung des Janalandes und der Neusibirischen Inseln in den Jahren 1885 und 1886 Ausgesandten expedition. [Scientific Results of the Imperial Academy of Sciences of the Investigation of Janaland and the New Siberian Islands from the Expeditions Launched in 1885 and 1886] Abtheilung III: Die fossilen Eislager und ihre Beziehungen su den Mammuthleichen. Memoires de L'Academie imperials des Sciences de St. Petersbouro, VII Serie, Tome XLII, No. 13, Commissionnaires de I'Academie Imperiale des sciences, St. Peterabourg, Russia.
  16. ↑ Nikolskiy, , P.A., L.D. Sulerzhitsky, and V.V. Pitulko, 2010, Last straw versus Blitzkrieg overkill: Climate-driven changes in the Arctic Siberian mammoth population and the Late Pleistocene extinction problem. Quaternary Science Reviews. doi:10.1016/j.quascirev.2010.10.017
  17. ↑ Ivanova, A. M., V. Ushakov, G. A. Cherkashov, and A. N. Smirnov, 1999, Placer Minerals of the Russian Arctic Shelf. Polarforschung. vol. 69, pp. 163-167.
  18. ↑ "Weather and Climate-The Climate of Kotelny Island" (in Russian). Weather and Climate (Погода и климат). Retrieved 27 February 2016.
  19. ↑ "Kotel'nyj Island (Kotelny Island) Climate Normals 1961–1990". National Oceanic and Atmospheric Administration. Retrieved 27 February 2016.

Further reading

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.