Larsen-C Ice Shelf

The Larsen Ice Shelf is a long ice shelf in the northwest part of the Weddell Sea, extending along the east coast of the Antarctic Peninsula from Cape Longing to Smith Peninsula. It is named after Captain Carl Anton Larsen, the master of the Norwegian whaling vessel ''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 broke away in July 2017 to form an iceberg known as A-68.

The ice shelf originally covered an area of , but following the disintegration in the north and the calving of iceberg A-68, it now covers an area of .

Research

The collapse of Larsen B has revealed a thriving chemotrophic ecosystem 800 m (half a mile) below the sea. The discovery was accidental. U.S. Antarctic Program scientists were in the north-western Weddell Sea investigating the sediment record in a deep glacial trough of roughly (twice the size of Texas or France). Methane and hydrogen sulfide associated with cold seeps is suspected as the source of the chemical energy powering the ecosystem. The area had been protected by the overlying ice shelf from debris and sediment which was seen to be building up on the white microbial mats after the breakup of the ice shelf. Clams were observed clustered about the vents.

The former Larsen A region, which was the farthest north and was just outside the Antarctic Circle, had previously broken up in the middle of the present interglacial and reformed only about 4,000 years ago. The former Larsen B, by contrast, had been stable for at least 10,000 years. The ice of the shelf is renewed on a much shorter time-scale and the oldest ice on the current shelf dates from only two hundred years ago. The speed of Crane Glacier increased threefold after the collapse of the Larsen B, likely due to the removal of a buttressing effect of the ice shelf. Data collected in 2007 by an international team of investigators through satellite-based radar measurements suggests that the overall ice-sheet mass balance in Antarctica is increasingly negative.Perlman, David (2008) "Antarctic Glaciers Melting More Quickly" San Francisco Chronicle (26 January) p. A2
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Breakup

The Larsen disintegration events were unusual by past standards. Typically, ice shelves lose mass by iceberg calving and by melting at their upper and lower surfaces. The disintegration events were linked by ''The Independent'' newspaper in 2005 to ongoing climate warming in the Antarctic Peninsula, about 0.5˚C (0.9˚F) per decade since the late 1940s.Connor, Steve (2005) "Ice shelf collapse was biggest for 10,000 years since Ice Age" ''The Independent,'' London (4 August)
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/ref> According to a paper published in ''Journal of Climate'' in 2006, the peninsula at Faraday station warmed by 2.94˚C (5.3˚F) from 1951 to 2004, much faster than Antarctica as a whole and faster than the global trend; anthropogenic global warming causes this localized warming through a strengthening of the winds circling the Antarctic.

Larsen A

The Larsen A ice shelf disintegrated in January 1995. It was an ice shelf near the Prince Gustav Ice Shelf, extending from Cape Longing to Robertson Island, and merged with Larsen B at Seal Nunataks. It was relatively stable and around 4000 km^2 from 1961, until around the 1980s, when large calving resulted in eventual collapse.

Larsen B

From 31 January 2002 to March 2002 the Larsen B sector partially collapsed and parts broke up, of ice thick, an area comparable to the US state of Rhode Island. In 2015, a study concluded that the remaining Larsen B ice-shelf would disintegrate by 2020, based on observations of faster flow and rapid thinning of glaciers in the area.

Larsen B was stable for at least 10,000 years, essentially the entire Holocene period since the last glacial period. By contrast, Larsen A was absent for a significant part of that period, reforming about 4,000 years ago.

Despite its great age, the Larsen B was clearly in trouble at the time of the collapse. With warm currents eating away the underside of the shelf, it had become a "hotspot of global warming". It broke over a period of three weeks or less, with a factor in this fast break-up being the powerful effects of water; ponds of meltwater formed on the surface during the near 24 hours of daylight in the summertime, flowed down into cracks and, acting like a multitude of wedges, levered the shelf apart. Other likely factors in the break-up were the higher ocean temperatures and the decline of the ice of the peninsula.

In the austral winter of 2011, a large expanse of sea ice formed over the embayment that was once covered by the land-fast shelf of fresh-water glacial ice of Larsen B. This enormous ice pack persisted through January 2022 when it suddenly broke-up over the course of a few days, "taking with it a Philadelphia-sized piece of the Scar Inlet Ice Shelf," according to NASA scientists examining images from the Terra and Aqua satellites.

Larsen C

, Larsen C was the fourth largest ice shelf in Antarctica, with an area of about .

Satellite radar altimeter measurements show that between 1992 and 2001, the Larsen Ice Shelf thinned by up to 0.27 ± 0.11 meters per year. In 2004, a report concluded that although the remaining Larsen C region appeared to be relatively stable,Riedl C, Rott H, Rack W (2004) "Recent Variations of Larsen Ice Shelf, Antarctic Peninsula, Observed by Envisat" ''Proceedings of the 2004 Envisat & ERS Symposium'', Salzburg, Austria
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/ref> continued warming could lead to its breakup within the following decade.Rignot, Eric (2007) "Mass Balance and Ice Dynamics of Antarctic Peninsula Glaciers for IPY2007-2008" Proposal #359, International Polar Year Expression of Intent.

The breakaway process for the iceberg had begun by mid-2016. On 10 November 2016 scientists photographed the growing rift running along the Larsen C ice shelf, showing it running about long with a width of more than , and a depth of . By December 2016, the rift had extended another to the point where only of unbroken ice remained and calving was considered to be a certainty in 2017. This was predicted to cause the calving of between nine and twelve percent of the ice shelf, , an area greater than the US state of Delaware, or twice the size of Luxembourg. The calved fragment was predicted to be thick and to have an area of about . The resulting iceberg was predicted to be among the largest icebergs ever recorded, unless it would break into multiple pieces.

On 1 May 2017 members of MIDAS reported that satellite images showed a new crack, around long, branching off the main crack approximately behind the previous tip, heading toward the ice front. Scientists with Swansea University in the UK say the crack lengthened from 25 May to 31 May, and that less than of ice is all that prevents the birth of an enormous iceberg. "The rift tip appears also to have turned significantly towards the ice front, indicating that the time of calving is probably very close," Adrian Luckman and Martin O'Leary wrote on Wednesday in a blog post for the Impact of Melt on Ice Shelf Dynamics and Stability project, or MIDAS. "There appears to be very little to prevent the iceberg from breaking away completely." The larger swath of the Larsen C ice shelf that sat behind the calved iceberg "will be less stable than it was prior to the rift" and may rapidly disintegrate in the same manner as Larsen B did in 2002.

In June 2017 the speed of the imminent Larsen C iceberg accelerated, with the eastern end moving at per day away from the main shelf. As discussed by the Project MIDAS researchers on their site: "In another sign that the iceberg calving is imminent, the soon-to-be-iceberg part of Larsen C ice shelf has tripled in speed to more than 10 meters per day between 24 and 27 June 2017. The iceberg remains attached to the ice shelf, but its outer end is moving at the highest speed ever recorded on this ice shelf."

On 7 July the Project MIDAS blog report stated: "The latest data from 6th July reveal that, in a release of built-up stresses, the rift branched several times. Using data from ESA's Sentinel-1 satellites, we can see that there are multiple rift tips now within 5 km (3.10 miles) of the ice edge. We expect that these rifts will lead to the formation of several smaller icebergs."

On 12 July 2017, Project MIDAS announced that a large, portion of Larsen C had broken from the main ice shelf at some point between 10 and 12 July. The iceberg, designated A-68, weighs more than a trillion tons and is more than thick.

Project MIDAS updated their blog information on 19 July 2017 regarding Larsen C by revealing that a possible new rift appeared to be extending northwards from the point where A-68 had broken off in mid-July. The project researchers felt this questionable new rift might turn towards the shelf edge, compounding the risk that it would "continue on to Bawden ice rise" which is considered "a crucial point of stabilization for Larsen C Ice Shelf."

As is true of all floating ice shelves, A68's departure from Antarctica had no immediate effect on global sea levels. However, a number of glaciers discharge onto the shelf from the land behind it, and they may now flow faster due to reduced support from the ice shelf. If all the ice that the Larsen C shelf currently holds back were to enter the sea, global waters would rise by an estimated .

Larsen D

The Larsen D Ice Shelf is between Smith Peninsula in the south and Gipps Ice Rise. It is considered to be generally stable. Over roughly the past fifty years it has advanced (expanded) whereas comparable George VI, Bach, Stange, and Larsen C ice shelves have retreated (to a much greater net extent). The most recent survey of Larsen D measured it at 22,600 km². 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.''Overview of areal changes of the ice shelves on the Antarctic Peninsula over the past 50 years.'' The Cryosphere Discussions. 3 pp579-630.
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Gallery

File:Antarctic Peninsula, the Larsen Ice Shelf, and the sea ice covered waters around the region.jpg, Clear view of the Antarctic Peninsula, the Larsen Ice Shelf, and the sea ice covered waters around the region.
File:Larsen B March 2013.jpg, Larsen B area in March 2013
File:LarsenC-detail photo 2016315 lrg.jpg, 2016 rift in Larsen C, detail
File:Larsen c crack nasa worldview 20170712.jpg, Imagery from NASA's Aqua MODIS showing the complete break of the ice shelf as of 12 July 2017
File:Larsen C breaks.jpg, Radar imagery from ESA's Sentinel-1B taken on 12 July 2017, showing the complete break

See also

* Glacial motion
* List of Antarctic ice shelves
* Larsen Inlet
* Sea level rise

Notes and references

External links

*

"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 in 6 days
(Swansea University, Project Midas - June 2017)

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Argentine Antarctica
British Antarctic Territory
Chilean Antarctic Territory
Geography of the British Antarctic Territory
Ice shelves of Antarctica
Landforms of the Antarctic Peninsula