Sentences with phrase «of ice sheet instability»

At least this one driver of ice sheet instability isn't operative.

Dr Konrad added: «These differences emphasise the complex nature of ice sheet instability across the continent, and being able to detect them helps us to pinpoint areas that deserve further investigation.»

Not exact matches

The first of these pathways, marine ice sheet instability, has been studied for decades, but the second, marine ice cliff instability, has only recently been considered as an important contributor to future sea level change.

«East Antarctic Ice Sheet has history of instability.»

Retreat of Pine Island Glacier controlled by marine ice - sheet instability.

A recent high - profile article stirred debate about the threat of a process known as marine ice - sheet instability in the Antarctic.

It's a positive feedback cycle, a viscious loop that means that future recession of the ice stream is inevitable (see Marine Ice Sheet Instability and previous posice stream is inevitable (see Marine Ice Sheet Instability and previous posIce Sheet Instability and previous post).

While all discussion of marine ice - sheet instability is shrouded in tremendous uncertainty, one thing is clear: whatever happens in far - off West Antarctica will have more profound impacts in Scandinavia than in nearby Australia.

The West Antarctic Ice Sheet: Instability, Disintegration, and Initiation of Ice Ages, Reviews of Geophysics and Space Physics, Vol.

But this is not the only potential mode of ice - sheet instability, and physical ice - sheet models incorporating only this mode of instability have difficulty reproducing the shrunken Antarctic ice sheet that appears to have characterized past geological warm periods.

Marine - based ice sheets are vulnerable to several types of instability.

Initiation and long - term instability of the East Antarctic Ice Sheet.

The new projections reflect the growing body of research about the different modes of ice - sheet instability.

Marine ice sheet instability is a classic example of hysteresis.

Thus two completely independent studies, using completely different methods, both find that the early stages of marine ice sheet instability may be underway in West Antarctica.

One recent modeling study focused on this mode of instability estimated that the Antarctic ice sheet has a 1 - in - 20 chance of contributing about 30 centimeters (1.0 feet) to global average sea - level rise over the course of this century and 72 centimeters (2.4 feet) by the end of the next century.

These simulations provide strong evidence that the process of marine - ice sheet instability is already underway on Thwaites Glacier, largely due to the observed high sub-ice shelf melt rates.

Calov, R., et al., 2002: Large - scale instabilities of the Laurentide ice sheet simulated in a fully coupled climate - system model.

The authors herald this as the start of marine ice sheet instability.

Bassis, the ice sheet scientist at the University of Michigan, first described the theoretical process of marine ice - cliff instability in research published only a few years ago.

The ice sheet in this area is grounded up to 2000 m below sea level, making it intrinsically unstable6 and susceptible to rapid melting at its base, and to rapid migration of the grounding line up the ice stream7 (see Marine Ice Sheet Instabilitice sheet in this area is grounded up to 2000 m below sea level, making it intrinsically unstable6 and susceptible to rapid melting at its base, and to rapid migration of the grounding line up the ice stream7 (see Marine Ice Sheet Instabilsheet in this area is grounded up to 2000 m below sea level, making it intrinsically unstable6 and susceptible to rapid melting at its base, and to rapid migration of the grounding line up the ice stream7 (see Marine Ice Sheet Instabilitice stream7 (see Marine Ice Sheet InstabilitIce Sheet InstabilSheet Instability).

The MISI is based on a number of studies that indicated the theoretical existence of the instability... The most fundamental derivation, that is, starting from a first - principle ice equation, states that in one - dimensional ice flow the grounding line between grounded ice sheet and floating ice shelf can not be stable on a landward sloping bed.

In Andrew Revkin's article today entitled «In Greenland, Ice and Instability», there is the quote: Eric Rignot, a longtime student of ice sheets at both poles for NASA's Jet Propulsion Laboratory, said he hoped the public and policymakers did not interpret uncertainty in the 21st - century forecast as reason for complacency on the need to limit risks by cutting emissioIce and Instability», there is the quote: Eric Rignot, a longtime student of ice sheets at both poles for NASA's Jet Propulsion Laboratory, said he hoped the public and policymakers did not interpret uncertainty in the 21st - century forecast as reason for complacency on the need to limit risks by cutting emissioice sheets at both poles for NASA's Jet Propulsion Laboratory, said he hoped the public and policymakers did not interpret uncertainty in the 21st - century forecast as reason for complacency on the need to limit risks by cutting emissions.

This implies major instability in components of both the Greenland and Antarctic Ice Sheets at temperatures likely to prevail by 2100, except perhaps at the lowest - emission scenario that we're rapidly pulling away from.

The question of when does this start is not really addressed in this paper that I can find, and has been addressed only peripherally in most of the papers about ice sheet instability that I have seen.

I first dug in on behavioral and social science research related to global warming views and responses in 2006, and it quickly became clear that this was the scariest body of science of all — topping ice - sheet instability and even calling into question the utility of my profession.

Note that such an ice dynamic uncertainty was only included for Greenland but not for Antarctica; instability of the West Antarctic Ice Sheet, a scenario considered «very unlikely» in the TAR, was explicitly not included in the upper limit of 88 ice dynamic uncertainty was only included for Greenland but not for Antarctica; instability of the West Antarctic Ice Sheet, a scenario considered «very unlikely» in the TAR, was explicitly not included in the upper limit of 88 Ice Sheet, a scenario considered «very unlikely» in the TAR, was explicitly not included in the upper limit of 88 cm.

The latter set of feedbacks, which include those due to ice sheet instability and the carbon cycle, are normally refered to as «slow feedbacks.»

Wilson (1964); Wilson (1966); Wilson (1969); Wilson's starting - point was the suggestion that the center of Antarctica was at the pressure melting point, see Robin (1962), p. 141, who adds that «one would not expect the ice to surge over a large part of Antarctica at one time»; the role of frictional heat in ice - sheet instability was pointed out back in 1961 (in partial support of Ewing - Donn theory), drawing on earlier work by G. Bodvarsson, by Weertman (1961).

At this stage, corresponding to a peak warming of 2 ° to 3 °C, both the West Antarctic Ice Sheet and the Wilkes Basin are experiencing rapid ice loss due to their instability, which manifests itself in a visible threshold in sea - level rise (see ImagIce Sheet and the Wilkes Basin are experiencing rapid ice loss due to their instability, which manifests itself in a visible threshold in sea - level rise (see Imagice loss due to their instability, which manifests itself in a visible threshold in sea - level rise (see Image).

«It merely suggests the presence of a natural contributor to West Antarctic ice sheet melt and instability,» he says.

A study using Earth Remote Sensing satellite radar interferometry (EERS - 1 and -2) observations from 1992 through 2011 finds «a continuous and rapid retreat of the grounding lines of Pine Island, Thwaites, Haynes, Smith, and Kohler» Glaciers, and the authors conclude that «this sector of West Antarctica is undergoing a marine ice sheet instability that will significantly contribute to sea level rise in decades to centuries to come» (Rignot et al. 2014).

Multiple studies of Antarctica indicate growing ice sheet instability, especially in the Amundsen Sea Embayment, where the Thwaites, Pine Island, Smith, Kohler, Pope, and Haynes Glaciers drain the central West Antarctic Ice Sheice sheet instability, especially in the Amundsen Sea Embayment, where the Thwaites, Pine Island, Smith, Kohler, Pope, and Haynes Glaciers drain the central West Antarctic Ice Ssheet instability, especially in the Amundsen Sea Embayment, where the Thwaites, Pine Island, Smith, Kohler, Pope, and Haynes Glaciers drain the central West Antarctic Ice SheIce SheetSheet.

When one couples the plausibility of underground heat causing instability in one region with the old newspaper articles about fears of ice sheet collapse from 100 years ago, at a minimum a reasonable person should wonder what has really been going on for many centuries.

On May 12, two studies were released that sounded the alarm about the instability of parts of the Antarctic ice sheet.

Favier, L., G. Durand, S. L. Cornford, G. H. Gudmundsson, O. Gagliardini, F. Gillet - Chaulet, T. Zwinger, A. J. Payne, and A. M. Le Brocq (2014), Retreat of Pine Island Glacier controlled by marine ice - sheet instability, Nat.

... Most projections for the Antarctic Ice Sheet since IPCC AR5 limit the sea - level contribution as a result of dynamic discharge and the potential onset of the marine ice sheet instability to 0.3 m by the end of this centuIce Sheet since IPCC AR5 limit the sea - level contribution as a result of dynamic discharge and the potential onset of the marine ice sheet instability to 0.3 m by the end of this cenSheet since IPCC AR5 limit the sea - level contribution as a result of dynamic discharge and the potential onset of the marine ice sheet instability to 0.3 m by the end of this centuice sheet instability to 0.3 m by the end of this censheet instability to 0.3 m by the end of this century.

Most climatologists believe that if temperatures rise more than another 1 degree C by 2100, conditions on the planet could become radically different and disruptive, including sharp shifts in precipitation patterns, more severe storms and droughts, the disappearance of the Arctic ice cap in summer, Greenland ice sheet instability, and much higher sea levels.

Retreat of Pine Island Glacier controlled by marine ice - sheet instability.

Until recently, the contribution of ice sheets to sea - level rise remained unknown and is still debated, but the current acceleration of sea - level rise is attributed to heating of the oceans and melting of land glaciers which is supported by measurements of ocean temperatures and the behavior of mountain glaciers, the vast majority of which are retreating or exhibit signs of instability.

If the ice - sheet bed deepens toward the center of the ice sheet, an instability exists, such that in the absence of additional stabilizers, the grounding line will advance with ice - sheet growth, or retreat with ice - sheet shrinkage, to a position where the bed rises towards the ice - sheet center.

The main uncertainty in predicting the actual magnitude of sea - level rise is the contribution from the Greenland and Antarctic ice sheets, but again, both ice sheets are exhibiting signs of instability.

· Freshwater influx from movements and melting of sea ice or ice sheets may lead to a weakening of the global thermohaline circulation, causing unpredictable instabilities in the climate system.

• Freshwater influx from the movements and melting of sea ice or ice sheets may lead to a weakening of the global thermohaline circulation, causing unpredictable instabilities in the climate system.

The journal Geophysical Research Letters details the major lines of evidence causing such instability in the ice sheet - something scientists have been fearing for some time.

But this is not the only potential mode of ice - sheet instability, and physical ice - sheet models incorporating only this mode of instability have difficulty reproducing the shrunken Antarctic ice sheet that appears to have characterized past geological warm periods.

They did not account for modern observations in calibrating marine ice - sheet instability, or probe rates of ice - cliff collapse as fast as the fastest currently seen in Greenland.

One recent modeling study focused on this mode of instability estimated that the Antarctic ice sheet has a 1 - in - 20 chance of contributing about 30 centimeters (1.0 feet) to global average sea - level rise over the course of this century and 72 centimeters (2.4 feet) by the end of the next century.

Significant short - term (decades to century - scale) temperature and sea levels fluctuations (several degrees and many meters) during the last ice age (about 110 — 15 thousand years ago) imply great instability of the Greenland and west Antarctic ice sheets.

In May of last year, two studies were released that sounded the alarm about the instability of parts of the Antarctic ice sheet.