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词条 Iceberg A-68
释义

  1. History and recent developments

  2. Gallery

  3. References

  4. External links

{{short description|Antarctic iceberg from the Larsen C Ice Shelf in July 2017}}{{Use dmy dates|date=July 2017}}Iceberg A-68 calved from the Larsen C Ice Shelf in July 2017.[1][2][3] With a surface area of 5,800 square kilometres, twice the size of Luxembourg, larger than Delaware and weighing one trillion tonnes,[4] it is one of the largest recorded icebergs, the largest being B-15 which measured 11,000 square kilometres before breaking up. The calving of A-68 reduced the overall size of the Larsen C shelf by 12 percent.[4]

There is no projected path at this point; however, historical data shows many icebergs broken off from the Antarctic Peninsula reach the South Georgia and the South Sandwich Islands.[5]

The name "A-68" was assigned by the US National Ice Center.

History and recent developments

A-68 was part of Larsen C, a section of the Larsen Ice Shelf. The scientific community is divided whether the calving is the result of climate change, or merely a natural occurrence.[6] Scientists found the crack beginning to form in November 2016, and others suggested that it might have broken off as early as a decade ago.{{fact|date=July 2017}} According to scientists observing the iceberg's path, A-68 "didn't just break through in one clean shot, [but] it formed a lace-network of cracks first."[4]

Satellite images from ESA and the European Union's Copernicus Program show that the iceberg is splintering, forming more icebergs in the process.[7]

Scientists are looking into the possibility of the ice shelf collapsing as a result of the split with A-68, or whether the iceberg was the "cork" for Larsen C that allows ice to flow more freely into the sea, thereby contributing to rising sea levels.[8]

Since November 2017, satelite images show A-68 is slowly drifting northward, with a widening gap to the main shelf. The gap was approximately five kilometers wide and contained a thin layer of loose, floating ice and a cluster of over 11 'smaller' bergs, one much larger than the rest.[9]

A British expedition on {{ship|RRS|James Clark Ross}} intended to sample the marine life at A-68 cleavage line in March 2018, but had to turn back due to thick sea ice.[10]

In July 2018 A-68 started to drift northwards.[11]

Gallery

References

1. ^{{cite web|title=Larsen C calves trillion ton iceberg|url=http://www.projectmidas.org/blog/calving/|publisher=Project MIDAS|accessdate=12 July 2017|date=12 July 2017}}
2. ^{{Cite news|url=https://www.bbc.com/news/science-environment-40321674|title=Giant iceberg splits from Antarctic|publisher=BBC|date=12 July 2017}}
3. ^{{cite news|url=http://edition.cnn.com/2017/07/12/world/larsen-c-antarctica/index.html|title=Massive iceberg breaks away from Antarctica|date=12 July 2017|work=CNN|accessdate=13 July 2017}}
4. ^1 2 {{Cite news|url=https://www.theguardian.com/world/2017/aug/02/what-happened-next-to-the-giant-larsen-c-iceberg|title=What happened next to the giant Larsen C iceberg?|last=Davis|first=Nicola|date=2017-08-02|work=The Guardian|access-date=2017-08-02|language=en-GB|issn=0261-3077}}
5. ^{{cite web|url=http://www.businessinsider.com/antarctica-larsen-c-iceberg-path-location-2017-7|title=Where Antarctic iceberg from Larsen C shelf might go in Southern Ocean|last=Mosher|first=Dave|date=12 July 2017|work=Business Insider|accessdate=21 July 2017}}
6. ^{{Cite news|url=https://theconversation.com/ive-studied-larsen-c-and-its-giant-iceberg-for-years-its-not-a-simple-story-of-climate-change-80529?|title=I've studied Larsen C and its giant iceberg for years – it's not a simple story of climate change|last=Luckman|first=Adrian|work=The Conversation|access-date=2017-08-02|language=en}}
7. ^{{Cite news|url=https://gizmodo.com/antarctica-s-massive-iceberg-is-starting-to-disintegrat-1797128227|title=Antarctica's Massive Iceberg Is Starting to Disintegrate| last=Dvorsky| first=George| work=Gizmodo| access-date=2017-08-02|language=en-US}}
8. ^{{Cite web|url=https://www.theverge.com/2017/8/2/16081998/ice-berg-larsen-c-ice-shelf-collapse-antarctica-climate-change| title=Cracks are still spreading where that massive Antarctic iceberg broke free| last=Becker| first=Rachel|date=2017-08-02|website=The Verge|access-date=2017-08-02}}
9. ^{{cite news| url=http://www.dailymail.co.uk/sciencetech/article-5082241/Earth-s-newest-iceberg-close-NASA-reveals-68-iceberg.html| title=Earth's newest iceberg up close: NASA reveals incredible new images of trillion ton A-68 which is the size of DELAWARE| publisher=Daily Mail| author=Mark Prigg| date=14 November 2017| accessdate=12 April 2018}}
10. ^{{cite web| url=https://www.bbc.com/news/science-environment-43257289| title=Mission to giant A-68 berg thwarted by sea-ice| first=Jonathan| last=Amos| date=March 2, 2018| publisher=BBC News| accessdate=12 April 2018}}
11. ^{{cite web |last1=Brandon |first1=Mark |title=A trillion tonnes of ice on the move: Iceberg A68A |url=http://mallemaroking.org/a-trillion-tonnes-of-ice-a68a/ |website=Mallemaroking |accessdate=31 August 2018}}

External links

  • {{Commons category-inline|Iceberg A-68}}

2 : Icebergs|Geography of Antarctica
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