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Topic: Larsen Ice Shelf

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	ScienceDaily: Larsen Ice Shelf (Site not responding. Last check: 2007-11-04)
		Ice Shelf Disintegration Threatens Environment, Queen's Study (August 9, 2005) -- The spectacular disintegration of Antarctica's "Larsen-B" Ice Shelf was unprecedented since the last ice age, according to a recent study published in Nature.
		Larsen Ice Shelf -- The Larsen Ice Shelf is a long, fringing ice shelf in the northwest part of the Weddell Sea, extending along the east coast of Antarctic Peninsula from Cape Longing to the area just southward of...
		Ice shelf -- An ice shelf is a thick, floating platform of ice that forms where a glacier or ice sheet flows down to a coastline and onto the ocean surface, typically in Antarctica or Greenland.
	www.sciencedaily.com /encyclopedia/Larsen_Ice_Shelf (1617 words)

	Larsen Ice Shelf - Wikipedia, the free encyclopedia
		The Larsen A ice shelf disintegrated in January of 1995.
		An image of the collapsing Larsen B Ice Shelf and a comparison of this to the U.S. state of Rhode Island.
		Larsen B Ice Shelf appeared also in the 2004 film The Day After Tomorrow where a huge chunk of ice fell off as Hall proclaimed 'the last chunk of ice that fell off was about the size of Rhode Island'.
	en.wikipedia.org /wiki/Larsen_Ice_Shelf (583 words)

	Geography Department, Cambridge » Larsen Ice Shelf
		The flight path crossed the ice shelf, starting north-west of the Mobiloil Inlet, and shows the presence of heavy crevasse rifting close to the ice shelf margins where outlet glaciers flow into the ice shelf.
		Remnant icebergs from the disintegrated Larsen-B Ice Shelf floating in calm waters.The photograph was taken shortly after the ice shelf collapsed rapidly in February 2002 (Photo: Colm Ó Cofaigh).
		The 1990 boundaries of the Larsen-A, -B and —C ice shelf sections are highlighted with blue, green and red borders.
	www.geog.cam.ac.uk /research/projects/larseniceshelf (657 words)

	USATODAY.com - Ice shelf in warmest part of Antarctica collapses (Site not responding. Last check: 2007-11-04)
		The Ice Shelf is on the Antarctic Peninsula and extends about 1,000 miles closer to the tip of South America than the rest of the Antarctic continent.
		The next portion of the ice shelf is known as Larsen C. It is losing stability and could suffer the same fate in the coming years if the warming trend continues, researchers said.
		Ice shelves are huge expanses of floating ice – the Ross Ice Shelf is roughly as big as Texas –; attached to the ice sheets that cover almost 98% of the Antarctic continent.
	www.usatoday.com /news/science/cold-science/2003-03-19-ant-ice.htm (788 words)

	Antarctic Ice Shelves
		Larsen B Ice Shelf Collapses in Antarctica: Recent satellite imagery analyzed at NSIDC revealed that the northern section of the Larsen B ice shelf has completely shattered and separated from the continent.
		Breakup of the Larsen B Ice Shelf: 15 February 1998 - 18 March 1999: Two ice shelves on the Antarctic Peninsula known as the Larsen B and Wilkins are in "full retreat" and have lost nearly 3,000 square kilometers of their total area in the last year.
		Ice Shelf Feels the Heat: "Warming waters may doom the Antarctic Peninsula's Larsen Ice Shelf, and other Antarctic ice shelves could be more endangered than had been thought, according to a paper published in the 31 October issue of Science." NSIDC researcher Ted Scambos is quoted in the paper.
	nsidc.org /iceshelves (536 words)

	Warm Seas Melting Ice Shelf the Size of Scotland
		An ice shelf in Antarctica the size of Scotland is rapidly disintegrating because of warmer seas, scientists said yesterday.
		Although the ice shelf will not raise sea levels - it is already floating on the ocean - scientists say that its loss may trigger a release of ice from the peninsula's mainland, causing global sea levels to rise by 1 meter (3ft 3in).
		The disappearance of the ice shelf might also affect the local ice sheets, large bodies of ice trapped on land by the ice shelf.
	www.commondreams.org /headlines03/1031-04.htm (686 words)

	EO Newsroom: New Images - Breakup of the Larsen Ice Shelf, Antarctica
		Recent Moderate-resolution Imaging Spectroradiometer (MODIS) satellite imagery analyzed at the University of Colorado’s National Snow and Ice Data Center revealed that the northern section of the Larsen B ice shelf, a large floating ice mass on the eastern side of the Antarctic Peninsula, has shattered and separated from the continent.
		Ice shelves are thick plates of ice, fed by glaciers, that float on the ocean around much of Antarctica.
		Based on studies of ice flow and sediment thickness beneath the ice shelf, scientists believe that it existed for at least 400 years prior to this event and likely existed since the end of the last major glaciation 12,000 years ago.
	earthobservatory.nasa.gov /Newsroom/NewImages/images.php3?img_id=8257 (510 words)

	CNN - Large Antarctic ice shelf disintegrating - April 17, 1998
		Antarctic Peninsula ice shelves have been in rapid retreat for the last few decades, apparently in response to a regional climate warming of 4.5 degrees F since the 1940s.
		Currently the Larsen B is the northernmost ice shelf in Antarctica, and therefore "on the front line of the warming trend," said Scambos.
		Ice shelves, thick plates of floating ice surrounding portions of Greenland and Antarctica, are fed by glaciers and snowfall.
	www.cnn.com /EARTH/9804/17/antarctica.shelf (608 words)

	Ice Shelf Collapse Biggest For 10,000 Years
		The piece of ice which sheered away from Larsen B into the sea in 2002 was roughly the size of Luxembourg.
		Although the disintegration of ice shelves does not itself cause sea levels to rise (because they are already floating), their loss is thought to speed up the flow of ice from ice sheets on land, causing sea levels to rise.
		Larsen B's smaller neighbour, Larsen A, broke off in 1995 and other much bigger ice shelves nearby, such as the Ross and Ronne, are also considered to be at risk of disintegrating, according to studies by the British Antarctic Survey in Cambridge.
	www.rense.com /general67/100yrs.htm (392 words)

	Antarctic Ice Shelf Collapses, March 2002
		Based on studies of ice flow and sediment thickness beneath the ice shelf, scientists believe that it existed for at least 400 years prior to this event, and likely existed since the end of the last major glaciation 12,000 years ago (see more about Dr. Eugene Domack's research).
		One idea is that meltwater seeping between ice crystals and warming of the shelf as a whole, reduces the fracture toughness of the ice so that the shelf shatters under the same stresses imposed by local geography and the flow it used to tolerate.
		Once their ice shelves are removed, the glaciers increase in speed due to meltwater percolation and/or a reduction of braking forces, and they may begin to dump more ice into the ocean than they gather as snow in their catchments.
	nsidc.org /iceshelves/larsenb2002/index.html (1468 words)

	Disintegration of an Antarctic ice shelf
		Thus weakened, the ice shelf is vulnerable to rapid break-up.
		Ice shelves are platforms of ice that go afloat where mountain glaciers and ice sheets flow from the land onto the ocean.
		The speed of the ice depends on shelf thickness and temperature, and the geometry of the bay walls and islands past which it flows.
	web.pdx.edu /~chulbe/science/Larsen/larsen2002.html (1348 words)

	Collapse of Antarctic Ice shelf unprecedented
		According to the cover article published in the August 4 issue of the journal Nature, the spectacular collapse of the Antarctica's Larson B Ice Shelf, an area roughly the size of Rhode Island, is unprecedented during the past 10,000 years.
		Using data collected from six sediment cores in the vicinity of the former ice shelf, Domack and his colleagues conclude that the Larsen ice shelf had been intact but was slowly thinning during the course of the current interglacial period.
		The Larsen B ice shelf is not alone in its demise.
	www.eurekalert.org /pub_releases/2005-08/hc-coa080305.php (326 words)

	Antarctic peninsula's Larsen B ice shelf stability and climate change
		Since a large portion of the Larsen B ice shelf collapsed in 2002, scientists have been studying the region for clues as to why the event occurred.
		The ice shelf collapse, some 12,500 square kilometers (km2) in area, was unprecedented during the past 10,000 years.
		Collapse of major ice shelves, such as the Larsen B ice shelf studied by Domack et al., can have adverse impacts to the Antarctic ecosystem, as coastal species are no longer able to survive in the changed environment.
	pubs.wri.org /pubs_content_text.cfm?ContentID=3961 (279 words)

	One Small Ice Shelf Dies, One Giant Iceberg Born
		The new iceberg calved from the Larsen Ice Shelf and measures 78 km x 37 km, (roughly the size of Oxfordshire), and is around 200 m thick.
		An ice shelf is the floating extension of the grounded ice sheet.
		It is composed of freshwater ice that originally fell as snow, either in situ or inland and brought to the ice shelf by glaciers.
	www.meteor.iastate.edu /gccourse/ocean/ross.html (976 words)

	Antarctic Ice Shelf Collapses: Global Warming Blamed
		On its website (www.nsidc.org) the University of Colorado-based center said a major part of the Larsen B ice shelf, believed to have been there for up to 12,000 years, had collapsed over a 35-day period.
		An Antarctic ice shelf the size of a small country has disintegrated under the impact of global warming, scientists said March 19, 2002.
		Last November the head of the Glaciological Division of the Instituto Antartico Argentino, Pedro Skvarca, warned of a possible break-up of Larsen, due to warm spring temperatures and a dramatic 20 percent rise in the rate of flow of the ice shelf.
	www.commondreams.org /headlines02/0319-01.htm (713 words)

	SPACE.com -- Satellite Captures Antarctic Ice Shelf's Collapse
		Satellite images have revealed the collapse of Larsen B ice shelf on the Antarctic Peninsula fulfilling predictions made by British Antarctic Survey (BAS) scientists.
		Larsen B is separate from a new, giant iceberg that satellites are tracking off Antarctica.
		In contrast, the Larsen ice shelf is on the Antarctic Peninsula and extends about 1,000 miles closer to the tip of South America than the rest of the Antarctic continent.
	www.space.com /scienceastronomy/planetearth/ice_shelf_020320.html (840 words)

	SIGHTINGS:
		British predictions that a massive ice shelf at the bottom of the world was in danger of breaking up were confirmed yesterday by photographs from space.
		In January, 1995, the Larsen A ice shelf to the north, measuring 48 miles by 32 miles and 600ft thick, collapsed completely during a storm.
		Ice shelves, thick plates of floating ice fed by glaciers and snowfall, cover 1.5million square miles.
	www.rense.com /earthchanges/iceshelfdisint.htm (892 words)

	Ice shelf - Wikipedia, the free encyclopedia
		An ice shelf is a thick, floating platform of ice that forms where a glacier or ice sheet flows down to a coastline and onto the ocean surface.
		The boundary between floating ice shelf and the grounded (resting on bedrock) ice that feeds it is called the grounding line.
		The primary mechanism of mass loss from ice shelves is iceberg calving, in which a chunk of ice breaks off from the seaward front of the shelf.
	en.wikipedia.org /wiki/Ice_shelf (450 words)

	Global Climate Change: Research Explorer - Cryosphere
		The recent collapse of the Larsen B ice shelf in West Antarctica (closest to South America), covered an area larger than the state of Rhode Island and sent thousands of icebergs drifting into the Weddell Sea.
		Ice inland are thick plates of ice fed by glaciers.
		Scientists studying the flow rates of the Ross Ice Shelf aren’t sure whether the ice is responding to an internal process or to the climate of parts of Antarctica.
	www.exploratorium.edu /climate/cryosphere/data5.html (454 words)

	Larsen-B Collapse - History and Ice Recession
		The Larsen ice shelf is one of the northernmost ice shelves in all of Antarctica, located between 60-62° W longitude and 65-66° S latitude on the eastern coast of the Antarctic Peninsula.
		The shelf is divided into four parts lettered 'A' through 'D:" Larsen-A is the northernmost section stuck between Robertson Island and the Sobral Peninsula while Larsen B is situated between Robertson Island and the Jason Peninsula (7).
		The Larsen-B ice shelf is fed by the Crane Glacier and the Hektoria-Green-Evans glacier system (1), and sediment samples taken near Larsen-B indicate that the shelf has been present for at least 12,000 years.
	www.uweb.ucsb.edu /~christowilson/recession.htm (441 words)

	[No title] (Site not responding. Last check: 2007-11-04)
		Although the initial retreats of their ice fronts may have resulted from iceberg calving beyond stable geometrical positions, it is not clear this explains the wholesale disintegration of large ice shelf sections.
		Whilst that mechanism provides a link between the regional climate warming and the break-up of ice shelves at the AP, direct observations are insufficient to determine the importance of ice shelf stability criteria or the impact of increased surface melt.
		The rate of elevation change of a floating ice shelf surface is due to fluctuations in sea level height, ocean and ice shelf densities, net surface and basal mass accumulation and ice flux divergence.
	igloo.gsfc.nasa.gov /wais/pastmeetings/abstracts03/Shepherd.html (664 words)

	larsen antarctic
		RIFTS in the Larsen B Ice Shelf, east of the Antarctic Peninsula, indicate that the shelf's collapse is "imminent", Greenpeace claimed last week.
		Helmut Rott of the University of Innsbruck in Austria, who is involved in a project to monitor Larsen B in the field and from satellite observations, agrees that the disintegration of the ice is likely to spread south.
		However, Doake notes that the ice shelf's disintegration correlated well with air temperature, and this suggests that the water beneath Larsen A may not have had much of a protective influence.
	www.dhushara.com /book/diversit/extra/arc/larsen.htm (1231 words)

	Antarctic Ice Shelf Collapse Tied to Global Warming
		The researchers found that stronger westerly winds in the northern Antarctic Peninsula, fueled primarily by human-induced climate change, were responsible for the dramatic summer warming that led to the retreat and collapse of the Larsen B ice shelf.
		Its disintegration was the third recent, sudden collapse of an Antarctic ice shelf, following the collapses of the 618-square mile Larsen A Ice Shelf in 1995 and the 425-square mile Wilkins Ice Shelf in 1998.
		Ice shelves act hold back glaciers from the sea and keep warmer marine air at a distance from the glaciers.
	www.ens-newswire.com /ens/oct2006/2006-10-16-03.asp (599 words)

	ESA - Observing the Earth - Envisat ASAR first check-up of the Earth - The story in pictures (Site not responding. Last check: 2007-11-04)
		During this most recent collapse a 200-metre-thick shelf with an area of 3,300 km2, equivalent in size to more than a third of the island of Corsica or the whole of Luxembourg, was lost.
		The collapse of the Larsen B ice shelf observed on 18 March 2002.
		Scientists estimate that the Larsen B ice shelf, which collapsed in spring 2002, had been stable since the last ice age 12 000 years ago – ice dynamic studies suggest it will take several hundred years of colder weather to completely rebuild it.
	www.esa.int /export/esaSA/ESAPEIF18ZC_earth_1.html (616 words)

	4. Warming Southern Ice
		Icebergs are made during rapid ice-shelf collapse, and during the normal transfer of mass from the ice sheet to the ocean.
		In a study published last October (see "Larsen Ice Shelf..." in the bibliography), Shepherd looked at the breakup of the Larsen Ice Shelf, off the Antarctic Peninsula.
		But the breakup of an ice shelf may "uncork" the glaciers behind it.
	whyfiles.org /203climate_change/4.html (680 words)

	Summertime water masses off the northern Larsen C Ice Shelf, Antarctica
		MWDW is observed at the ice front, having tracked west along the northward facing slopes of depressions that reach to the shelf break.
		Ice Shelf Water observed near the ice front is not, however, derived from MWDW directly, but from MWDW pre-conditioned by winter cooling and by salinification from sea ice production.
		If the ice shelf base generally is being melted only by pre-conditioned MWDW, then, contrary to recent suggestions, changes in the temperature of the deep Weddell Sea are unlikely to have a major impact on melt rates at the base of Larsen C Ice Shelf.
	www.agu.org /pubs/crossref/2004/2004GL019924.shtml (279 words)

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