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Thread: A massive iceberg just broke off Antarctica’s Larsen C ice shelf

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    A massive iceberg just broke off Antarctica’s Larsen C ice shelf

    A massive iceberg just broke off Antarctica’s Larsen C ice shelf
    By New Scientist staff and Press Association
    One of the largest icebergs on record has broken away from an ice shelf in Antarctica.
    Researchers who have been monitoring a huge crack in the Larsen C Ice Shelf, which had left a vast iceberg more than a quarter the size of Wales “hanging by a thread”, say the rift has finally completed its path through the ice.
    A 5800-square-kilometre iceberg weighing more than a trillion tonnes has now calved, the team from the Swansea University-led Midas project said.
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    The final breakthrough happened between Monday and Wednesday and was detected in data from Nasa’s Aqua MODIS satellite instrument.

    The calving of the iceberg, which is likely to be named A68, reduces the size of the Larsen C Ice Shelf by around 12 per cent and will change the landscape of the Antarctic Peninsula forever, the scientists said.
    “We have been anticipating this event for months, and have been surprised how long it took for the rift to break through the final few kilometres of ice,” said Adrian Luckman of Swansea University, lead investigator of the Midas project. “We will continue to monitor both the impact of this calving event on the Larsen C Ice Shelf, and the fate of this huge iceberg.”
    Story here:
    https://www.newscientist.com/article...n-c-ice-shelf/

    it will supply the Kennedy's ice for nightcaps..........read that somewhere
    on a more serious note, it will not cause a rise in sea levels, but it might case minor desalination. Most of it will end up in our atmosphere............
    For waltky: http://quakes.globalincidentmap.com/
    "The Nation that makes a great distinction between its scholars and its warriors will have its thinking done by cowards and its fighting done by fools."
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    There is a big writeup on it in National geographic magazine!

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    update...it appears that A68 has broken apart.....
    look out CA...A68 is gonna come get ya
    Last edited by stjames1_53; 07-14-2017 at 04:41 PM.
    For waltky: http://quakes.globalincidentmap.com/
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    There have been much more massive antarctic ice sheet break-offs in the past. The current story is being used by the climate hustlers.
    " I'm old-fashioned. I like two sexes! And another thing, all of a sudden I don't like being married to what is known as a 'new woman'. I want a wife, not a competitor. Competitor! Competitor!" - Spencer Tracy in 'Adam's Rib' (1949)

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    Quote Originally Posted by jimmyz View Post
    There have been much more massive antarctic ice sheet break-offs in the past. The current story is being used by the climate hustlers.
    Yep, i'll buy that for a dollar!
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    Quote Originally Posted by jimmyz View Post
    There have been much more massive antarctic ice sheet break-offs in the past. The current story is being used by the climate hustlers.
    The fact of the matter is that the Antarctic shelf is expanding on it's own, Thus the calving
    For waltky: http://quakes.globalincidentmap.com/
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    Iceberg A-68 heads out to sea...

    Big Antarctic iceberg edges out to sea
    22 September 2017 - The giant berg A-68 looks finally to be on the move.
    Recent weeks have seen it shuffle back and forth next to the Antarctic ice shelf from which it broke away. But the latest satellite imagery now indicates the near-6,000 sq km block is swinging out into the Weddell Sea. A wide stretch of clear water has opened up between the berg's southern end and the remaining Larsen shelf structure, suggesting A-68 is set to swing around and head north. This is the direction the Weddell currents should take the iceberg. Polar experts expect the trillion-tonne block to essentially bump along the shelf edge until it reaches the great eastward movement of ocean water known as the Antarctic Circumpolar Current.


    Widening gap: The picture contains data gathered on 13 and 16 September

    This would then export what is one of the largest bergs ever recorded out into the South Atlantic. How far A-68 actually gets along this predicted path is anyone's guess, however. The berg already shows evidence of fragmentation at its edges. These bits - they carry the designation A-68b, A-68c, etc - all still float close to their parent. But in time they will get separated, and it is entirely possible that big segments with deep keels could get anchored in shallow waters and become semi-permanent "ice islands". A-68 calved during mid-winter and it required radar satellites - such as Europe's Sentinel-1 spacecraft - with their unique ability to pierce cloud and darkness to keep track of developments.


    With the return now to longer days in the Antarctic, opportunities are increasingly opening up for high-resolution optical satellites to take a close look at the state of the berg. And new imagery from the Spanish Deimos-2 spacecraft shows how the initial sharp edges of the block's northern-western corner have been lost. Scientists are not just looking at the berg; they also continue to monitor the Larsen Ice Shelf. They are checking to see if its behaviour has changed since the calving. The shelf is the floating protrusion of glaciers coming off the Antarctic landmass, and the ejection of such a large section of its structure could potentially trigger further fracturing or a change in the speed of ice flow. So far, however, there is little evidence of either.


    When A-68 moves clear of its birth position it will reveal seafloor that probably has not been free of ice cover for 120,000 years - during the peak of the last warm phase in Earth's history known as the Eemian. The area has already gained protected status from the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR). This gives scientists priority access and keeps fisheries activity at bay for a minimum of two years. Previous research in locations uncovered by departing bergs has found new species. Expeditions to visit A-68 this coming Antarctic summer season are in the planning stage.

    http://www.bbc.com/news/science-environment-41366504

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    Quote Originally Posted by waltky View Post
    Iceberg A-68 heads out to sea...

    Big Antarctic iceberg edges out to sea
    22 September 2017 - The giant berg A-68 looks finally to be on the move.
    It'll break up into smaller pieces and at this time it will be of no danger to the shipping lanes.
    For waltky: http://quakes.globalincidentmap.com/
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    Cool

    Proof of global warming...

    Large Iceberg Breaks Free From Glacier in Southern Chile
    November 28, 2017 - A large iceberg broke off the Grey glacier in southern Chile, authorities said on Tuesday, adding that the cause of the rupture was unclear.
    Chile's CONAF forestry service shared photos on social media of the enormous block of blue-white ice, which measured 350 meters (1,148 feet) long by 380 meters (1,247 feet) wide, as it floated free in waters of a glacial lagoon near the southern tip of the South American continent.



    Tourists visit the Grey Lake, located in the 230,000-hectare Torres del Paine National Park in the Chilean Patagonia, about 1,960 km south of Santiago



    Park officials at Chile's Torres del Paine National Park, home to the glacier, said such ruptures were rare and had not occurred since the early 1990s.


    Torres del Paine is one of Chile's most popular tourist attractions, famous for its mountain views and visited by more than 115,000 tourists annually, according to CONAF.


    https://www.voanews.com/a/large-iceb...e/4140832.html

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    Due to rising global temperatures...

    Southern Chile Iceberg Splits From Glacier, Threatens Navigation
    December 01, 2017 — The recent calving of a large iceberg from a southern Chilean glacier threatens local ship navigation and could result in flooding for costal communities, experts said.
    An iceberg measuring some 350 by 380 meters (1,150 by 1,250 feet) broke from the Grey glacier in far southern Chile in late November. The size of the break surprised local scientists who monitor the glacier. "Events like this are part of a short-term irreversible tendency" due to rising global temperatures, said Raul Cordero, a climate change expert at the Universidad de Santiago.



    View of the Grey glacier at the Torres del Paine National Park in Magallanes, Chile



    The iceberg now seems like a large chunk of ice, "but it will become a threat" since it will move out to sea and break up into smaller pieces, said Ricardo Jana, a glaciologist at the Chilean National Antarctic Institute. Given its size, the smaller icebergs likely to break off can create problems for area navigation, Jana said. The icebergs will also contribute to a rise in the sea level, "putting coastal communities at risk for possible flooding," Jana said.


    The Grey glacier is located at the Torres del Paine National Park, some 3,200 kilometers (2,000 miles) south of the capital Santiago. Over the past 30 years the glacier — now measuring some 270 square kilometers — has lost about two square kilometers of ice. The glacier is part of the Southern Patagonia Ice Fields, the third largest land-based ice field after Antarctica and Greenland. The Ice Fields straddle southern Chile and Argentina.


    https://www.voanews.com/a/southern-c...n/4145871.html

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