2 edition of West Antarctic ice sheet fluctations in the Antarctic Peninsula area found in the catalog.
West Antarctic ice sheet fluctations in the Antarctic Peninsula area
David E. Sugden
Written in English
Offprint from: Nature, v.286 (1980) p.378-381.
|Statement||D.G. Sugden and C.M. Clapperton.|
|Contributions||Clapperton, Chalmers M.|
Many glaciers along the margins of the Greenland and Antarctic ice sheets are accelerating and, for this reason, contribute increasingly to global sea-level rise 1,2,3,4,5,6,ly, ice . Abstract Fluctuations in Antarctic Ice Sheet elevation and mass occur over a variety of time scales, owing to changes in snowfall and ice ﬂow. Here we disentangle these signals by combining 25 years of satellite radar altimeter observations and a regional climate model. From these measurements, patterns ofCited by: 4.
Antarctica is so harsh and remote that scientists only began true investigation of its ice sheet in the s. It didn't take long for the verdict on the West Antarctic Ice Sheet to come in. "Unstable," wrote Ohio State University glaciologist John Mercer in The Antarctic Ice Sheet is usually divided into three ice sheets: The Antarctic Peninsula Ice Sheet, the West Antarctic Ice Sheet, and the East Antarctic Ice Sheet. The East Antarctic Ice Sheet makes up the majority of the Antarctic Ice Sheet, and has a global sea level equivalent of 53 m 1. 19 of these metres would be from glacier ice grounded.
The Antarctic Peninsula is part of the larger peninsula of West Antarctica, protruding 1, km ( miles) from a line between Cape Adams (Weddell Sea) and a point on the mainland south of Eklund Islands. Beneath the ice sheet which covers it, the Antarctic Peninsula consists of a . -however, appears to be a relatively warm period during the Pliocene ( Ma) in which the West Antarctic Ice Sheet may have been reduced greatly -after Ma, Antarctic .
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The ice shelf in George VI Sound has built up subsequently. The West Antarctic ice sheet is believed to be inherently unstable because much of it is grounded below sea level1– by: We present here some geomorphological evidence from Alexander Island and the Antarctic Peninsula which does not agree with either hypothesis.
Rather, following deglaciation from the Wisconsin maximum, there was less ice than at present around 8, yr ago. The ice shelf in George VI Sound has built up subsequently.
Changes in Earth's orbit are known to influence climate shifts from cold glacials to warm interglacials. How the vast West Antarctic ice sheet responds to these fluctuations is uncertain but Cited by: The cracks appeared on Pine Island Glacier, a part of the West Antarctic ice sheet which has been shedding rapidly increasing amount of ice into the ocean over the last 25 years.
Scientists anticipate the cracks, which measure over 20 kilometers long, could soon lead to the creation of an enormous new ice berg. The Antarctic Peninsula comprises a relatively long and thin spine of Alpine-style mountains, plateaux and islands that extend northwards towards the Drake Passage as far north as 63°S ().It averages 70 km in width and has a mean height of m (Summerhayes et al., ).It iskm 2 in area and 80% is ice-covered (Bindschadler, ).
Cited by: It is now almost 30 years since John Mercer () first presented the idea that climate change could eventually cause a rapid deglaciation, or “collapse,” of a large part of the West Antarctic ice sheet (WAIS), raising world sea levels by 5 m and causing untold economic and social impacts.
This idea, apparently simple and scientifically plausible, created a vision of the future Cited by: Antarctic Peninsula Ice Sheet. East Antarctic Ice Sheet. Antarctic datasets. This page focuses on introducing the Antarctic Ice Sheet. Antarctica is actually composed of three ice sheets: the Antarctic Peninsula, the West Antarctic Ice Sheet, and the East Antarctic Ice Sheet.
You may also be interested in reading about the Patagonian Ice Sheet. The Antarctic Ice Sheet is today and has been for several million years a major component of the global climate system, responsible for deep- and bottom-water formation and eustatic sea-level change. It is also a source of "noise" in the oxygen isotopic record, which limits the value of that record to other studies through most of the Cenozoic.
West Antarctica, or Lesser Antarctica, one of the two major regions of Antarctica, is the part of that continent that lies within the Western Hemisphere, and includes the Antarctic Peninsula.
It is separated from East Antarctica by the Transantarctic Mountains and is covered by the West Antarctic Ice Sheet. It lies between the Ross Sea, and the Weddell Sea. It may be considered a giant peninsula stretching. Antarctic Peninsula, also called Palmer Peninsula, Graham Land, or Tierra de O’Higgins, peninsula claimed by the United Kingdom, Chile, and forms an mile (1,km) northward extension of Antarctica toward the southern tip of South peninsula is ice-covered and mountainous, the highest point being Mount Jackson at 10, feet (3, metres).
AIS = Antarctic Ice Sheet; EAIS = East AIS; WAIS = West AIS; APIS = Antarctic Peninsula ice sheet; LEW = leading edge width. Although most of the AIS surface has changed little in elevation over the past 25 years (Figure 2), there are clear patterns of thinning and thickening in coastal sectors—especially in WAIS and the by: 4.
The change in elevation from to (expressed in cen- timeters per year) of 63% of the grounded Antarctic Ice Sheet at a resolution of 1° by 1°, determined from ERS satellite altimeter measurements. Super- imposed are the bound- aries of the major drain- age basins derived from ERS observations.
The model-integrated annual average SMB for the ice sheet including ice shelves (minus the Antarctic Peninsula, AP) now amounts to Gt y⁻¹, with an interannual variability of Gt y⁻¹.
During the early Holocene epoch—and since the s—variations in Southern Hemisphere westerly winds controlled the upwelling of Circumpolar Deep Water and seemingly ice-sheet retreat in West Cited by: The Amundsen Sea Embayment (ASE) drains approximately 35% of the West Antarctic Ice Sheet (WAIS) and is one of the most rapidly changing parts of the cryosphere.
In order to predict future ice sheet behaviour, modellers require long-term records of ice-sheet melting to constrain and build confidence in their by: West Antarctica and the Antarctic Peninsula.
The West Antarctic Ice Sheet (WAIS) contains enough ice to raise global sea levels by more than 5 m and, according to altimetry and interferometry, one key sector is in a state of rapid retreat (23, 34).Cited by: West Antarctica, the smaller portion, is a mosaic of small blocks of continental crust covered by the West Antarctic Ice Sheet and an Andean-like mountain chain forming the Antarctic Peninsula.
Most of the West Antarctic Ice Sheet is grounded below sea level, in places over miles below sea level. Marine geological studies provide a record of diachronous expansion and retreat of the Antarctic Peninsula Ice Sheet, West Antarctic Ice Sheet and East Antarctic Ice Sheet during the past c. 30 cal yr BP.
Retreat of these ice sheets and Antarctica’s contribution to sea-level rise was largely complete by the early Holocene. “Altogether, ice losses from east and west Antarctica have contributed mm to global sea level rise since ” Pictured is an iceberg at Marguerite Bay in the Antarctic Peninsula (Andrew.
Ice sheets, and in particular the West Antarctic ice sheet, are expected to shrink in size as the world warms, which in turn will raise sea level.
A Review of the literature suggests that much of Cited by:. West Antarctic Peninsula: An Ice-Dependent Coastal Marine Ecosystem in Transition Article (PDF Available) in Oceanography (Washington D.C.) 26(3) September with Reads.
It's absolutely huge: The Antarctic Ice Sheet covers million square miles, making it roughly the same area as the lower 48 states of the U.S. and Mexico combined. The Latest Antarctic Ice Sheet Alarmist Con Posted on 18 May 19 by Jaime Jessop 41 Comments The media is buzzing frenziedly with tales of the impending doom of almost a quarter of the West Antarctic ice sheet, with ‘catastrophic’ rises in sea levels as a consequence.