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List of glaciers

(Redirected from Glaciers of Venezuela)

A glacier (US: /ˈɡleɪʃər/ GLAY-shər) or (UK: /ˈɡlæsiə/) is a persistent body of dense ice that is constantly moving under its own weight; it forms where the accumulation of snow exceeds its ablation (melting and sublimation) over many years, often centuries. Glaciers slowly deform and flow due to stresses induced by their weight, creating crevasses, seracs, and other distinguishing features. Because glacial mass is affected by long-term climate changes, e.g., precipitation, mean temperature, and cloud cover, glacial mass changes are considered among the most sensitive indicators of climate change. There are about 198,000 to 200,000 glaciers in the world.[1]

List of glaciers
Conness Glacier on Mount Conness

Catalogs of glaciers include:

Glaciers by continent

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Africa

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Main article: List of glaciers in Africa
 
Furtwängler Glacier (foreground) as it appeared in August 2014. Behind the glacier are snowfields and the Northern Icefield.

Africa, specifically East Africa, has contained glacial regions, possibly as far back as the last glacier maximum 10 to 15 thousand years ago. Seasonal snow does exist on the highest peaks of East Africa[2][3] as well as in the Drakensberg Range of South Africa, the Stormberg Mountains, and the Atlas Mountains in Morocco. Currently, the only remaining glaciers on the continent exist on Mount Kilimanjaro, Mount Kenya, and the Rwenzori.[4]

Antarctica

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Main article: List of glaciers in the Antarctic
 
Canada Glacier in Antarctica

There are many glaciers in the Antarctic. This set of lists does not include ice sheets, ice caps or ice fields, such as the Antarctic ice sheet, but includes glacial features that are defined by their flow, rather than general bodies of ice. The lists include outlet glaciers, valley glaciers, cirque glaciers, tidewater glaciers and ice streams. Ice streams are a type of glacier[5] and many of them have "glacier" in their name, e.g. Pine Island Glacier. Ice shelves are listed separately in the List of Antarctic ice shelves. For the purposes of these lists, the Antarctic is defined as any latitude further south than 60° (the continental limit according to the Antarctic Treaty System).[6]

There are also glaciers in the subantarctic. This includes one snow field (Murray Snowfield). Snow fields are not glaciers in the strict sense of the word, but they are commonly found at the accumulation zone or head of a glacier.[7] For the purposes of this list, Antarctica is defined as any latitude further south than 60° (the continental limit according to the Antarctic Treaty).[8]

Asia

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Main article: List of glaciers in Asia

Europe

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Main article: List of glaciers in Europe

The majority of Europe's glaciers are found in the Alps, Caucasus and the Scandinavian Mountains (mostly Norway) as well as in Iceland. Iceland has the largest glacier in Europe, Vatnajökull Glacier, that covers between 8,100 and 8,300 km2 in area and 3,100 km3 in volume. Norway alone has more than 2500 glaciers (including very small ones) covering an estimated 1% of mainland Norway's surface area. Several of mainland Europe's biggest glaciers are found here including; Jostedalsbreen (the largest in mainland Europe at 487 km2), Vestre Svartisen (221 km2), Søndre Folgefonna (168 km2) and Østre Svartisen (148 km2). The two Svartisen glaciers used to be one connected entity during the Little Ice Age but has since separated.[9][10]

North America

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Main category: Glaciers of North America
 
Chenega Glacier, an active glacier in Alaska

There are a number of glaciers existing in North America, currently or in recent centuries. In the United States, these glaciers are located in nine states, all in the Rocky Mountains or further west. The southernmost named glacier among them is the Lilliput Glacier in Tulare County, east of the Central Valley of California.

Mexico has about two dozen glaciers, all of which are located on Pico de Orizaba (Citlaltépetl), Popocatépetl and Iztaccíhuatl, the three tallest mountains in the country.[11]

Oceania

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Further information: List of glaciers in New Zealand
 
Animated map of the extent of the glaciers of the Carstens Range from 1850 to 2003

No glaciers remain on the Australia mainland or Tasmania. A few, like the Heard Island glaciers are located in the territory of Heard Island and McDonald Islands in the southern Indian Ocean.

New Guinea has the Puncak Jaya glacier.

New Zealand contains many glaciers, mostly located near the Main Divide of the Southern Alps in the South Island. They are classed as mid-latitude mountain glaciers. There are eighteen small glaciers in the North Island on Mount Ruapehu.[13]

An inventory of South Island glaciers compiled in the 1980s indicated there were about 3,155 glaciers with an area of at least one hectare (2.5 acres).[14] Approximately one sixth of these glaciers covered more than 10 hectares. These include:

South America

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Main article: List of glaciers in South America
 
Chimborazo

Glaciers in South America develop exclusively on the Andes and are subject of the Andes various climatic regimes namely the Tropical Andes, Dry Andes and the Wet Andes. Apart from this there is a wide range of latitudes on which glaciers develop from 5000 m in the Altiplano mountains and volcanoes to reaching sealevel as tidewater glaciers from San Rafael Lagoon (45° S) and southwards. South America hosts two large ice fields, the Northern and Southern Patagonian Ice Fields, of which the latter is the second largest contiguous body of glaciers in extrapolar regions.

The glaciers of Venezuela are located in the mountains of the Sierra Nevada de Mérida. In 1910, maps made by the explorer Alfredo Jahn showed the Sierra Nevada glaciers covering about 1,000 hectares (2,500 acres). An ice trade at that time saw ice men or hieleros transporting glacier ice by mule or on foot to Mérida for sale, a six hour journey.[15]

Venezuela's glacier coverage shrank to about 280 hectares (700 acres) in 1952, and 80 hectares (200 acres) in 1985.

The last remaining glacier, located on Pico Humboldt, was estimated to cover 10 hectares (25 acres) in 2011.[15]

Remote islands

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Further information: List of glaciers in the sub-Antarctic
 
Cook Glacier

List of longest glaciers on Earth in non-polar regions

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The following is the list of longest glaciers in the non-polar regions, generally regarded as between 60 degrees north and 60 degrees south latitude, though some definitions[16] expand it slightly.

  1. Vanch-Yakh Glacier, Tajikistan – 77 km (48 mi)[17]
  2. Siachen Glacier, India– 70 km (43 mi) when measuring from Indira Col.[18] or 76 km (47 mi) using the longest route as is done when determining river lengths
  3. Biafo Glacier, Pakistan – 67 km (42 mi)
  4. Brüg Glacier, Chile – 66 km (41 mi)
  5. Baltoro Glacier, Pakistan – 63 km (39 mi)
  6. South Inylchek Glacier, China and Kyrgyzstan – 60.5 km (37.6 mi)
  7. Batura Glacier, Pakistan – 57 km (35 mi)

See also

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References

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  1. ^ "Mapping the World's Glaciers".
  2. ^ Kaser, Georg; Noggler, Bernd (1991). "Observations on Speke Glacier, Ruwenzori Range, Uganda". Journal of Glaciology. 37 (127): 313–318. Bibcode:1991JGlac..37..313K. doi:10.1017/S0022143000005736.
  3. ^ Hastenrath, Stefan (1984). The Glaciers of Equatorial East Africa. Solid Earth Sciences Library. Kluwer Academic Publishers. ISBN 978-90-277-1572-2.
  4. ^ "East African Highlands | ICCI – International Cryosphere Climate Initiative". Iccinet.org. Archived from the original on 2014-03-07. Retrieved 2014-03-07.
  5. ^ National Snow and Ice Data Center. "Types of Glacier". Archived from the original on 2010-04-17.
  6. ^ The text of the Antarctic Treaty Archived 2013-05-11 at the Wayback Machine, article VI ("Area covered by Treaty") states: "The provisions of the present Treaty shall apply to the area south of 60° South latitude"
  7. ^ Dr. Sue Ferguson, United States Department of Agriculture Forest Service. "Types of Glacier". University of Colorado, Boulder, Colorado: National Snow and Ice Data Center. Archived from the original on 17 April 2010. Retrieved 1 June 2010.
  8. ^ Office of Polar Programs (OPP) (26 April 2010). "The Antarctic Treaty". The National Science Foundation, Arlington, Virginia. Archived from the original on 28 June 2010. Retrieved 1 June 2010.
  9. ^ "Bre - NVE". nve.no. Archived from the original on 22 June 2017. Retrieved 30 April 2018.
  10. ^ "Saltfjellet-Svartisen - Norske Naturperler". naturperler.com. Archived from the original on 22 April 2016. Retrieved 30 April 2018.
  11. ^ White, Sidney E. (2001). "Glaciers of Mexico" (PDF). Glaciers of North America. United States Geological Survey. Archived (PDF) from the original on October 17, 2012. Retrieved July 8, 2012.
  12. ^ Rignot E., Kanagaratnam P. (2006). "Changes in the velocity structure of the Greenland Ice Sheet". Science. 311 (5763): 986–990. Bibcode:2006Sci...311..986R. doi:10.1126/science.1121381. PMID 16484490. S2CID 22389368.
  13. ^ Chinn, Trevor J.H., (1988),Glaciers of New Zealand Archived 2008-07-06 at the Wayback Machine, in Satellite image atlas of glaciers of the world, U.S. Geological Survey professional paper; 1386, ISBN 0-607-71457-3.
  14. ^ Chinn, Trevor J.H., (1988), Glaciers of New Zealand, in Satellite image atlas of glaciers of the world, U.S. Geological Survey professional paper; 1386, ISBN 0-607-71457-3.
  15. ^ a b Rodríguez, Jeanfreddy Gutiérrez and María Fernanda (2019-01-15). "Watching Venezuela's Last Glacier Disappear". The Atlantic. ISSN 1072-7825. Retrieved 2019-01-27.
  16. ^ "NASA – Earth's Non-polar Glaciers and Ice Caps". www.nasa.gov. Archived from the original on 23 May 2017. Retrieved 30 April 2018.
  17. ^ Exact lengths are relatively easy to determine with modern maps and imagery so as to include recent glacial retreat. Measurements are from recent imagery, supplemented with Russian 1:200,000 scale topographic mapping as well as the 1990 "Orographic Sketch Map: Karakoram: Sheet 2", Swiss Foundation for Alpine Research, Zurich.
  18. ^ Dinesh Kumar (13 April 2014). "30 Years of the World's Coldest War". The Tribune. Chandigarh, India. Archived from the original on 17 April 2014. Retrieved 18 April 2014.
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