Sentences with phrase «ice shelf edge»

Not exact matches

More than once we had lost one of our four engines, and in 1987 a giant crack became persistently visible along the edge of the Larsen B ice shelf, off the Antarctic Peninsula — making it abundantly clear that an emergency landing would be no gentle touchdown.

The Scar Inlet ice shelf, Scambos says, «is teetering on the edge.»

Scientists have drilled into one of the most isolated depths in all of the world's oceans: a hidden shore of Antarctica that sits under 740 meters of ice, hundreds of kilometers in from the sea edge of a major Antarctic ice shelf.

This isolated cavity of seawater, down at the grounding zone, sits deep beneath the back corner of the ice shelf — 850 kilometers back from where the edge of the ice meets the open sea.

Break up of a floating «ice shelf» in front of the glacier left tall ice «cliffs» at its edge.

Jansen and colleagues simulated likely paths that the crack could take as it spreads toward the ice shelf's edge.

«The ice shelf generally breaks at points that are between a half and full thickness of the ice sheet from the edge,» summarises Christmann.

Floating ice shelves mark the outermost edges of an ice sheet and line nearly half the Antarctic coastline.

That makes it vulnerable to collapse, because seawater can flow in underneath it and transform its edge into a floating ice shelf like Larsen B, which might then break up, freeing the ice behind it.

Its floating front edge, the Totten ice shelf, sticks out like a tongue over the water and acts as a buttress for the giant glacier, slowing its movement toward the ocean.

Ice shelves (the floating front edges of glaciers that extend tens to hundreds of miles offshore) melt more because of contact with ocean water below them than they do because of sunlight.

That's because it appears that most of the action is happening beneath the ice shelves — those giant plains of floating ice that cling to the continent's edges.

The station lies at 71 ° 57» S and 23 ° 20» E, 220 km due South from the edge of the ice shelf.

At the Last Glacial Maximum, palaeo - ice streams extended to the shelf edge in West Antarctica and in the Antarctic Peninsula, but in East Antarctica they usually were restricted to the mid-outer shelf [44].

Ice shelves are floating masses of ice on the edge of the continental ice sheIce shelves are floating masses of ice on the edge of the continental ice sheice on the edge of the continental ice sheice sheet.

Schematic cartoon of a glacier flowing into an ice shelf, showing the grounding line and calving at the ice cliff at the edge of the ice shelf.

The Larsen C ice shelf is 217 miles thick and sits at the edge of West Antarctica, holding back the flow of glaciers feeding into it.

Other factors would include: — albedo shifts (both from ice > water, and from increased biological activity, and from edge melt revealing more land, and from more old dust coming to the surface...); — direct effect of CO2 on ice (the former weakens the latter); — increasing, and increasingly warm, rain fall on ice; — «stuck» weather systems bringing more and more warm tropical air ever further toward the poles; — melting of sea ice shelf increasing mobility of glaciers; — sea water getting under parts of the ice sheets where the base is below sea level; — melt water lubricating the ice sheet base; — changes in ocean currents -LRB-?)

The rates of rapid rise Jim Hansen talks about occurred when large ice sheets covered Canada and the Antarctic ice sheet extended to the edge of the continental shelf.

One reason, as other Antarctic research has shown, is that the speed of loss of Antarctic ice is to a large extent not a function of air temperature in any case, but of ocean heat intruding beneath the vast shelves of floating ice around the edges.

From your link: «In some instances, bright red spots or streaks along the edge of the continent show where icebergs calved or ice shelves disintegrated, meaning the satellite began seeing warmer ocean water where there had previously been ice.»

But without the ice shelves to impede the flow of glacial ice, typically moving 400 — 900 meters a year, the flow of ice from the continent could accelerate, leading to a thinning of the ice sheet on the edges of the Antarctic continent.

Unlike the formerly - glaciated regions of the Northern Hemisphere, 98 % of Antarctic bedrock remains covered by ice and the ice sheet edge is fringed by extensive ice shelves; this hampers the collection of data on ice history and introduces substantial uncertainty in reconstructions.

They will compete with, and perhaps eat, specialised species dependent on the ice shelf's edge for food.

These authors postulated an extended Barents Sea Ice Sheet, the western part of the huge Eurasian Ice Sheet51, 55, that had reached the shelf edge causing polynya - like open - water conditions (triggered by strong katabatic winds) with phytoplankton and sea ice algae production, subglacial meltwater outflow and the deposition of suspended material on the slope at site PS2138 -Ice Sheet, the western part of the huge Eurasian Ice Sheet51, 55, that had reached the shelf edge causing polynya - like open - water conditions (triggered by strong katabatic winds) with phytoplankton and sea ice algae production, subglacial meltwater outflow and the deposition of suspended material on the slope at site PS2138 -Ice Sheet51, 55, that had reached the shelf edge causing polynya - like open - water conditions (triggered by strong katabatic winds) with phytoplankton and sea ice algae production, subglacial meltwater outflow and the deposition of suspended material on the slope at site PS2138 -ice algae production, subglacial meltwater outflow and the deposition of suspended material on the slope at site PS2138 - 2.

During the LGM, a thick grounded ice sheet extended close to the continental shelf edge in the Ross Embayment.

The study also found that the Southern Ocean Circumpolar Current, which helps determine sea - ice extent, is steered by submerged ridges and canyons along the edge of the Antarctic continental shelf, rather than by global warming or other climatic conditions.

This ocean will be incredibly important for sea level rise, because the easiest way to destabilise the Antarctic Ice Sheet is to warm up the ocean and melt the ice shelves (the edges of the ice sheet which extend over the ocean) from belIce Sheet is to warm up the ocean and melt the ice shelves (the edges of the ice sheet which extend over the ocean) from belice shelves (the edges of the ice sheet which extend over the ocean) from belice sheet which extend over the ocean) from below.

Eventually, the leading edge forms a cantilevered ice shelf that floats on the water but remains attached to the anchored part of the ice sheet.

During a flight over the Pine Island Glacier ice shelf, the DC - 8 banks over the Amundsen Sea and the clean edge of the ice shelf front.

Lead author of the study Joseph MacGregor said in a statement: «Typically, the leading edge of an ice shelf moves forward steadily over time, retreating episodically when an iceberg calves off (breaks off and floats out to sea), but that is not what happened along the shear margins.»

Scientists first detected a rift in the glacier in October 2011 during flights for NASA's Operation IceBridge.By July 2013, infrared and radar images indicated that the crack had cut completely across the ice shelf to the southwestern edge.

Warmer water has been detected closer to the edges of Antarctica in recent years, and that can accelerate the melting of ice shelves from below.

Through a complex interplay among the ocean, ice shelves, and atmosphere, very cold, dense water builds up on the continental shelves and eventually spills over their edges, mixing with surrounding water and sinking to the sea floor.

Where the ice shelves have collapsed some of the glaciers have apparently tripled their speed so on the edges there is a downward grade in spots (as evidenced from the topology map...

The answer is that since the effect of CO2 is at the surface, rather than distributed throughout the troposphere, then the surface of the Antarctic ice shelves melted supplying fresh water to the sea ice edge.

The scientists report in Geophysical Research Letters journal that they had discovered that although shelf ice could be expected to wear at the ocean edge, something else was happening in West Antarctica.