رصيف لارسن الجليدي
رصيف لارسن الجليدي Larsen Ice Shelf هورصيف جليدي طويل في الجزء الشمالي الغربي من بحر ودل، ويمتد بطول الساحل الشرقي لـشبه جزيرة أنتارتيكا من رأس لونگنگ إلى المنطقة إلى الجنوب مباشرة من جزيرة هيرست. وهومسمى على اسم الكاپتن كارل أنطون لارسن، سيد سفينة صيد الحيتان النرويجية Jason, who sailed along the ice front as far as 68°10' South during December 1893. In finer detail, the Larsen Ice Shelf is a series of shelves that occupy (or occupied) distinct embayments along the coast. From north to south, the segments are called Larsen A (the smallest), Larsen B, and Larsen C (the largest) by researchers who work in the area. Further south, Larsen D and the much smaller Larsen E, F and G are also named.
The breakup of the ice shelf since the mid-1990s has been widely reported, with the collapse of Larsen B in 2002 being particularly dramatic. A large section of the Larsen C shelf was reported to have broken away in the week beginningعشرة July 2017.
الرصيف الجليدي
الانفصال
لارسن A
The Larsen A ice shelf disintegrated in January 1995.
لارسن B
From 31 January 2002 to March 2002 the Larsen B sector partially collapsed and parts broke up, 3,250 kم2 (3.50×1010 قدم2) of ice 220 م (720 قدم) thick, an area comparable to the US state of Rhode Island. In 2015, a study concluded that the remaining Larsen B ice-shelf will disintegrate by 2020, based on observations of faster flow and rapid thinning of glaciers in the area.
لارسن C
اعتبارا من July 2017[تحديث], Larsen C is the fourth largest ice shelf in Antarctica, with an area of about 44,200 kم2 (4.76×1011 قدم2).
لارسن D
The Larsen D Ice Shelf is located between Smith Peninsula in the south and Gipps Ice Rise in the north. It is considered to be generally stable. Over roughly the past fifty years it has advanced where the other ice shelves George VI, Bach, Stange, and Larsen C have all retreated. However, this gain has been relatively small in comparison to the retreat of the others. The most recent survey of Larsen D measured it at 22,600 square kilometres. There is fast ice along the entire front. This makes it difficult to interpret the ice front because the semi-permanent sea ice varies in thickness and may be nearly indistinguishable from shelf ice.
معرض صور
Larsen A and Larsen B ice shelves marked in red.
Clear view of the Antarctic Peninsula, the Larsen Ice Shelf, and the sea ice covered waters around the region.
Larsen B area in March 2013
2016 rift in Larsen C, detail
انظر أيضاً
- Glacier retreat
- List of Antarctic ice shelves
- Larsen Inlet
- Sea level rise
الهامش
- ^ U.S. Geological Survey Geographic Names Information System: رصيف لارسن الجليدي
- ^ Fox, Douglas. "Witness to an Antarctic Meltdown". 307 (1): 54–61. doi:10.1038/scientificamerican0712-54.
- ^ Rignot, E; Jacobs, S; Mouginot, J; Scheuchl, B (13 June 2013). "Ice Shelf Melting Around Antarctica" (PDF). Science. 341 (6143): 266–270. doi:10.1126/science.1235798. Retrieved 21 January 2017.
- ^ ice Break in Antartica
- ^ Chris Wickham (9 May 2012). "Warm water threatens vast Antarctic ice shelf (+video)". The Christian Science Monitor / Reuters. Retrieved 20 January 2017.
- ^ "Iceberg four times the size of London breaks off from Antarctica ice shelf". The Daily Telegraph. 12 July 2017.
- ^ Hulbe, Christina (2002). "Larsen Ice Shelf 2002, warmest summer on record leads to disintegration". Portland State University.
- ^ "NASA Study Shows Antarctica's Larsen B Ice Shelf Nearing Its Final Act" (Press release). NASA. 14 May 2015.
- ^ "Growing Crack in Antarctica's Larsen C Ice Shelf Spotted by NASA's MISR".
- ^ Overview of areal changes of the ice shelves on the Antarctic Peninsula over the past 50 years. The Cryosphere Discussions. ثلاثة pp579-630. URL: http://www.the-cryosphere-discuss.net/3/579/2009/tcd-3-579-2009.pdf
وصلات خارجية
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مشاع الفهم فيه ميديا متعلقة بموضوع Larsen Ice Shelf. |
- "Break up of the Larsen Ice Shelf, Antarctica", NASA Earth Observatory.
- Coastal-change and Glaciological Map of the Larsen Ice Shelf Area, Antarctica, 1940-2005 United States Geological Survey
- Antarctic ice rift close to calving, after growing 17km inستة days (Swansea University, Project Midas - June 2017)
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