Sentences with phrase «of ice sheet retreat»
«Well, we do have past records of ice sheet retreat under climates warmer than present so we decided to determine what those rates of retreat were.»
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Such effect would delay the anticipated pace of ice sheet retreat.
«We're providing mechanistic explanations for how those dramatic sorts of rates of ice sheet retreat could actually happen,» DeConto told me, «but we don't need [Hansen's] feedback [to reach similar conclusions.]»
Polar amplification, in which temperatures at the poles rise more rapidly than temperatures at the equator (due to factors like the global atmospheric and oceanic circulation of heat from the equator to the poles), plays a major role in the rate of ice sheet retreat.
Polar amplification, in which temperatures at the poles rise more rapidly than temperatures at the equator (due to factors like the global atmospheric and oceanic circulation of heat from the equator to the poles), plays a major role in the rate of ice sheet retreat.
Not exact matches
The governor, who has been around the state politics since the Laurentide ice sheet retreated, knows something about the tortured relationship between the chief magistrate of the state's largest city and the state capital.
In comparison, it took the Jakobshavn Isbræ ice stream — a southwest Greenland region with a fast - moving glacier that has been a focal point of scientific examination of ice sheet melt — 150 years to retreat 35 kilometers, said Khan.
Evidence of past glacial advance and retreat is also more easily observed in the Dry Valleys, providing a window into the past behavior of the vast Antarctic ice sheets and their influence on global sea levels.
Today's red deer, which recolonized Europe after the ice sheet melted about 12,000 years ago, fall into three or four distinct lineages that likely correspond to separate southern regions to which the deer had retreated during the height of the ice age, Stanton says.
Today, as warming waters caused by climate change flow underneath the floating ice shelves in Pine Island Bay, the Antarctic Ice Sheet is once again at risk of losing mass from rapidly retreating glacieice shelves in Pine Island Bay, the Antarctic Ice Sheet is once again at risk of losing mass from rapidly retreating glacieIce Sheet is once again at risk of losing mass from rapidly retreating glaciers.
Eventually, the floating ice shelf in front of the glaciers «broke up», which caused them to retreat onto land sloping downward from the grounding lines to the interior of the ice sheet.
Thousands of marks on the Antarctic seafloor, caused by icebergs which broke free from glaciers more than ten thousand years ago, show how part of the Antarctic Ice Sheet retreated rapidly at the end of the last ice age as it balanced precariously on sloping ground and became unstabIce Sheet retreated rapidly at the end of the last ice age as it balanced precariously on sloping ground and became unstabice age as it balanced precariously on sloping ground and became unstable.
Their results overcome a basic problem of trying to discern the deep history of ice from bedrock: every time an ice sheet retreats and then grows back, it scours away the bedrock and the isotope record of its own past.
Satellite studies of Earth's gravitational field show that North America is still rebounding from the weight of the massive Laurentide Ice Sheet, which retreated thousands of years ago
Massive reorganizations of the ocean - atmosphere system, the authors argue, are the key events that link cyclic changes in the earth's orbit to the advance and retreat of ice sheets
The reason for the retreat of the ice sheets remains elusive, however.
The biggest changes were seen in West Antarctica, where more than a fifth of the ice sheet has retreated across the sea floor faster than the pace of deglaciation.
The advance and retreat of ice sheets is paced by cyclical changes in the shape of Earth's orbit.
Twelve thousand years ago, the great ice sheets retreated at the beginning of the latest interglacial — the Flandrian — allowing humans to return to northern latitudes.
Then, as they moved into coastal North America after ice sheets there began retreating around 16,000 years ago, they could have continued to dine on a wealth of coastal foods.
But the good news is that an aggressive reduction in emissions will limit the risk of major Antarctic ice sheet retreat.»
Melting of the smaller Greenland Ice Sheet can only explain a fraction of this sea - level rise, most which must have been caused by retreat on Antarctica.»
The revised estimate for sea - level rise comes from including new processes in the 3 - dimensional ice sheet model, and testing them against past episodes of high sea - levels and ice retreat.
According to the team's data, ice advanced from the Aurora Basin and retreated back again at least 11 times during the first 20 million years of the ice sheet's history.
In 2014, two papers, one in Science and one in Geophysical Review Letters, noted that the Thwaites Glacier, which some scientists call the «weak underbelly» of the West Antarctic Ice Sheet, has retreated dramatically over the past 2 decades.
A new model, investigating the retreat of this ice sheet and its many impacts has just been published in Quaternary Science Reviews.
Dr Ohneiser says that one of the key implications of the study is that changes in global sea - level are uneven when ice sheets expand or retreat.
The only way that significant amounts of this mud could have been deposited as sediment in the sea would be if the ice sheet had retreated inland and eroded these rocks, say the team.
We determine that this difference is driven by the growth and retreat of large continental ice sheets that are present in the cold ice - age climates; these ice sheets reflect a lot of sunlight and their growth consequently amplifies the impact of CO2 changes.»
Researchers used geologic evidence and ice sheet models to construct a timeline of the Cordilleran's advance and retreat.
The Knife Point Glacier, one of the range's fastest retreating ice sheets, melted three times faster between 1999 and 2015 than it did between 1966 and 1999.
THE MOTIVE For millions of years, Antarctica's ice sheet has advanced and retreated as Earth has cooled and warmed.
The new result focuses on ice loss due to a major retreat of an outlet glacier connected to a long «river» of ice — known as an ice stream — that drains ice from the interior of the ice sheet.
The unstoppable retreat is the likely start of a long - feared domino effect that could cause the entire ice sheet to melt, whether or not greenhouse gas emissions decline.
Gerhard Kuhn, co-author of the study, said, «Our results provide evidence that in the past, [West Antarctic Ice Sheet -RCB- retreat was also predominantly caused by melting through warm ocean water.»
Like frozen levees, the retreating glaciers pin back more stable parts of the Greenland - size ice sheet.
«These glaciers will keep retreating for decades and even centuries to come and we can't stop it,» said lead study author Eric Rignot, a glaciologist at the University of California, Irvine, and NASA's Jet Propulsion Laboratory in Pasadena, Calif. «A large sector of the West Antarctic Ice Sheet has passed the point of no return.»
To track the growth and retreat of ice cover in the region, Miller and colleagues have been hunting for remnants of scraggly mosses along the edges of the island's retreating ice sheets.
The abrupt changes seen in the Greenland ice cores are due to sea - ice changes and the slower changes are the growth or retreat of continental ice sheets.
Retreat of Pine Island Glacier controlled by marine ice - sheet instability.
Hindmarsh, R.C.A., and E. Le Meur, Dynamical processes involved in the retreat of marine ice sheets, Journal of Glaciology, in press.
Thomas, R.H., and C.R. Bentley, A model for Holocene retreat of the West Antarctic ice sheet, Quaternary Research, Vol.
Ice sheet retreat continues until a new equilibrium temperature state is reached, one determined largely by the end - point of atmospheric CO2.
A model of a polar ice stream, and future sea - level rise due to possible drastic retreat of the West Antarctic ice sheet.
Especially in West Antarctica, where much of the ice sheet sits below sea level, complex interactions at the edge of the ice sheet can sensitively affect the rate of ice - sheet retreat.
There is evidence that greenhouse gas levels fell at the start of ice ages and rose during the retreat of the ice sheets, but it is difficult to establish cause and effect (see the notes above on the role of weathering).
This feedback could potentially result in the rapid loss of parts of the ice sheet, as grounding lines retreat along troughs and basins that deepen towards the ice sheet's interior.
Since then, the world has seen cycles of glaciation with ice sheets advancing and retreating on 40,000 - and 100,000 - year time scales called glacials (glacial advance) and interglacials (glacial retreat).
The Antarctic Ice Sheet first formed as a small ice cap (maybe several) in the early Oligocene, but retreating and advancing many times until the Pliocene, when it came to occupy almost all of AntarctiIce Sheet first formed as a small ice cap (maybe several) in the early Oligocene, but retreating and advancing many times until the Pliocene, when it came to occupy almost all of Antarctiice cap (maybe several) in the early Oligocene, but retreating and advancing many times until the Pliocene, when it came to occupy almost all of Antarctica.
The rapid shrinkage of glaciers around the Antarctic Peninsula, coupled with the potential for ice - shelf collapse and grounding line retreat, raises concerns for the future of the West Antarctic Ice Sheet, and this is an area of urgent current research [ice - shelf collapse and grounding line retreat, raises concerns for the future of the West Antarctic Ice Sheet, and this is an area of urgent current research [Ice Sheet, and this is an area of urgent current research [3].