Sentences with phrase «sheet collapsed»

As climate warmed, and the ice sheet collapsed, enormous amounts of methane were abruptly released.

If the West Antarctic Ice Sheet collapsed, it could raise seas by 16 feet (5 meters), which would be disastrous.

Although the heat source isn't a new or increasing threat to the West Antarctic ice sheet, it may help explain why the ice sheet collapsed rapidly in an earlier era of rapid climate change, and why it is so unstable today.

The heat source isn't new or increasing, but may help explain why the ice sheet collapsed so rapidly in an earlier area of climate change and remains unstable.

As climate warmed, and the ice sheet collapsed, enormous amounts of methane were abruptly released.

She studies the mechanisms of ice sheet collapse, the origins of subglacial lakes, and their hidden ecosystems.

«Dramatic ice sheet collapse 135 thousand years ago triggered strong global climate change.»

When the planet's big ice sheets collapsed at the end of the last ice age, their melting caused global sea levels to rise as much as 100 meters in roughly 10,000 years, which is fast in geological time, Mann noted.

To project that trend forward, the team then used models recently developed to analyze Antarctic ice sheet collapse, plus large global data sets to tailor specific Atlantic tropical cyclone data and create «synthetic» storms to simulate future weather patterns.

One 2004 NASA - led study found that most of the glaciers they were studying «flow into floating ice shelves over bedrock up to hundreds of meters deeper than previous estimates, providing exit routes for ice from further inland if ice - sheet collapse is under way.»

Given that the West Antarctic Ice Sheet has a total sea level equivalent of 3.3 m1, with 1.5 m from Pine Island Glacier alone4, marine ice sheet collapse could be a significant challenge for future generations, with major changes in rates of sea level rise being possible within just the next couple of hundred years.

This process is difficult to accurately model, but rapid ice sheet collapse would certainly result in dramatically higher rates of sea level rise once this critical threshold is passed.

Once this threshold is passed, rapid ice sheet collapse could occur, which would spill over into other basins and perhaps spell an end for the West Antarctic Ice Sheet.

Geologic shoreline evidence has been interpreted as indicating a rapid sea level rise of a few meters late in the Eemian to a peak about 9 meters above present, suggesting the possibility that a critical stability threshold was crossed that caused polar ice sheet collapse [84]--[85], although there remains debate within the research community about this specific history and interpretation.

If the West Antarctic Ice Sheet collapses, sea level will fall close to the Antarctic and will rise much more than the expected estimate in the northern hemisphere because of this gravitational effect;

Hence our answer to the question, «are the observations of the last few decades a harbinger of continued ice sheet collapse in West Antarctica?»

However, we should consider the scenarios where a disastrous Greenland ice sheet collapse occurs in case that can happen.

Among the benefits of paying the AGU associate membership even if you're not a climate scientist — prompt notice of new papers, some about climate, e.g. how do surface meltwater lakes contribute to ice sheet collapse.

Are there any studies done to model a worst case ice sheet collapse, such as WAIS collapse causing a mega tsunami?

Take the Science paper: «Marine Ice Sheet Collapse Potentially Under Way for the Thwaites Glacier Basin, West Antarctica.»

Until we have a shift in attitudes in the USA towards the precautionary approach, we will continue to bicker about whether this or that climate impact (be it frogs, salmon, hurricanes, ice sheet collapse, etc.) is REALLY due to climate change or not.

But it appears far more likely that a better understanding of these processes will act to revised our estimates of ice sheet collapse timescales downward, rather than upward.

«Which is the more environmentally sensitive thing to do: let the Greenland ice sheet collapse, or throw a little sulfate in the stratosphere?»

In Hansen, 2005, he talks about the use of the word «explosive» in relationship to ice sheet collapse.

Which is the more environmentally sensitive thing to do: let the Greenland ice sheet collapse and polar bears become extinct, or throw a little sulfate in the stratosphere?

Revelle (1983); similarly Thomas et al. (1979); Bentley (1980) saw a possible ice sheet collapse in the next 500 years; but Bentley (1982) said melting could take thousands of years; this was disputed by Hughes (1982); Hollin (1980) tried to demonstrate an East Antarctic ice sheet surge about 95,000 years ago; for predictions of meter - scale rises, see Jones and Henderson - Sellers (1990), pp. 10 - 11, 15; a skeptic: Van der Veen (1985); Van der Veen (1988).

«West Antarctic Ice Sheet Collapse — the Fall and Rise of a Paradigm.»

Right, but there hasn't been an ice sheet collapse we're on the left hand case, not the right hand case, so the next time someone blathers on about intense storms and global warming, you set»em straight, ok?

Marine Ice Sheet Collapse Potentially Underway for the Thwaites Glacier Basin, West Antarctica

The longer global warming continues, the greater the risk of «waking the sleeping giants» — major feedbacks such as ice sheet collapse, methane «burps,» or ecosystem collapse — that could ignite abrupt or runaway warming beyond our control.

Since the ice sheet collapse are not demonstrated, global warming as modeled means less intense storms.

Change arising from some sources, such as volcanic eruptions or the West Antarctic Ice Sheet collapsing, may be abrupt — but they don't flip back just as quickly, centuries later.

The second Weichselian Icelandic ice sheet collapse, onshore (est. net wastage 221 Gt a − 1 over 750 years), similar to today's Greenland rates of mass loss, has been attributed to atmospheric Bølling - Allerød warming.

Potential sea level rise outside the likely range is heavily asymmetric towards higher amounts due to plausible ice sheet collapses.

Even if the estimates of the ice sheet collapsing by the end of the century were correct, however, it would likely take much longer than that for the effect of methane hydrates to become detectable in the atmosphere, says Alexey Portnov, a researcher at the Arctic University of Tromsø in Norway.

NASA glaciologist Eric Rignot said western ice sheet collapse is «unstoppable» and could dramatically raise sea levels.

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.

If Antarctica's ice sheets collapse, it would expose these hydrates, inundating them with seawater as the ocean washed over portions of the continent.

I remember the terrible warning of the ice sheets collapsing.

The problem would be made far worse if the Antarctic or Greenland ice sheets collapse — something that's difficult to forecast.

Knies, J. & Vogt, C. Freshwater pulses in the eastern Arctic Ocean during Saalian and early weichselian ice - sheet collapse.

Start with guest post Ice Sheet Collapse?

IPCC now declares that in the 21st Century, Atlantic Ocean circulation collapse is «very unlikely,» ice sheet collapse is «exceptionally unlikely,» and catastrophic release of methane from melting permafrost is «very unlikely.»

«We don't know where the ice - sheet collapse tipping point is, but we are dangerously close.»

Joughin, I., B. E. Smith, and B. Medley (2014), Marine ice sheet collapse potentially under way for the Thwaites Glacier Basin, West Antarctica, Science, 344 (6185), 735 — 738.

The evolution of this drainage system almost certainly governs the process of ice - sheet collapse (2 - 5).

While sea level has varied greatly in the past, it has generally changed slowly, over many thousands of years — except when ice sheets collapse.

We will explain more on ice sheet collapse later, but prior to about 1900, we know sea level was stable for several thousand years.

Predictions for the year 2100 are in the range of two to three feet, excluding any potential contributions from ice sheet collapse.

Joughin, I., Smith, B. E. & Medley, B. Marine ice sheet collapse potentially under way for the Thwaites Glacier basin, West Antarctica.