Sentences with phrase «laurentide ice sheet retreated»
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.
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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 unstable.
«Ice - cliff collapse has been debated as a theoretical process that might cause West Antarctic Ice Sheet retreat to accelerate in the future,» said co-author Dr Robert Larter, from the British Antarctic Survey.
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.
Around 11,000 years ago, as the last ice sheets retreated from Norway and the Norwegian Sea, Atlantic water flowed in and warmed the bottom by about 9 degrees Fahrenheit.
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.
But the good news is that an aggressive reduction in emissions will limit the risk of major Antarctic ice sheet retreat.»
Ice sheet retreat continues until a new equilibrium temperature state is reached, one determined largely by the end - point of atmospheric CO2.
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.
In the warm periods like today, the ice sheets retreated completely.
It also drained to the Chehalis River until the Chimacum Valley, in the northeast Olympic Peninsula, melted, allowing the lake's water to rapidly drain north into the marine waters of the Strait of Juan de Fuca, which was rising as the ice sheet retreated.
Again about WAIS collapse Here at this mark 35 mins in R. Alley explains why Ice Sheet retreat is based on thresholds (local topography).
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.
As temperatures warmed slightly due to insolation changes caused by orbital cycles, ice sheets retreated slightly.
As ice sheets retreat, several mechanisms cause greenhouse gases — carbon dioxide, methane and nitrous oxide — to increase.
# 186 David Benson: While you may be correct about the GIS and Swiss glaciers, the Laurentide Ice sheet retreated from northern Quebec (i.e. the mainland) about 6500 years ago.
Ice sheet retreat continues until a new equilibrium temperature state is reached, one determined largely by the end - point of atmospheric CO2.
Ice sheet retreat: Levy et al. (2016).
«Potential Antarctic Ice Sheet Retreat Driven by Hydrofracturing and Ice Cliff Failure.»
Pollard, D., Deconto, R. M. & Alley, R. B. Potential Antarctic Ice Sheet retreat driven by hydrofracturing and ice cliff failure.
Warm ocean water plays a significant role in melting glacial ice from below, and a better mapping of Antarctica's and Greenland's landforms beneath the ice suggests that ocean melting of the glacier fronts may play a more significant role than previously thought as the ice sheets retreat (under a global warming scenario).
As that ice sheet retreated, some 20,000 years ago, the sea floor started bouncing back.
The originally hypothesized source of freshwater was the eastward routing of Glacial Lake Agassiz from the Mississippi River to the St. Lawrence River, as the Laurentide Ice Sheet retreated northward out of the Great Lakes (Johnson and McClure, 1976; Rooth, 1982; Broecker, 2006).
Comment: Radiocarbon deglaciation chronology of the Thunder Bay, Ontario area and implications for ice sheet retreat patterns
Carlson, A.E., F.S. Anslow, E.A. Obbink, A.N. LeGrande, D.J. Ullman, and J.M Licciardi (2009) Surface - melt driven Laurentide Ice Sheet retreat during the early Holocene.
This adds a new concern to rapid ice sheet retreat.
If the ice sheets retreat the weight of the ice will be lifted from the ocean floor, the gas hydrates will be destabilised and the methane will be released.
Clearly, to simulate ice sheet retreat, simulated oceans must change their vertical and horizontal extents as the ocean invades the space occupied by the ice sheet and receives meltwater from the glacier.
Humans didn't make Greenland Ice Sheet retreat and evince the name * Green * land before the Little Ice Age.
«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.]»
«But the good news is that an aggressive reduction in emissions will limit the risk of major Antarctic ice sheet retreat.»
Such effect would delay the anticipated pace of ice sheet retreat.
As massive ice sheets retreated during past ice ages, their weight on the land below lifted and the land rebounded.
«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.»
We have mountains of data on the retreat of the Laurentide ice sheet and the vegetational development as the ice sheet retreated from pollen records.
When asked about the retreat of Alpine glaciers, he says, «What do they find when the ice sheets retreat, in the Alps?
«Since most ice sheet erosion occurs at the margin of the ice sheet, that indicated times when the ice sheet retreated,» Cook said.
Not exact matches
«The question is, will we push carbon dioxide high enough in the future that the Northern Hemisphere remains ice free and the advances and retreats begin again with the Southern Hemisphere ice sheets.»
Additionally, the Zachariae glacier at the ice sheet margin began its retreat and moved into deeper water, which exacerbated the melt, said Bevis.
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.
«As the ice sheet rapidly retreated, the hydrates concentrated in mounds, and eventually started to melt, expand and cause over-pressure.
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.
«If we remove these buttressing ice shelves, unstable ice thicknesses would cause the grounded West Antarctic Ice Sheet to retreat rapidly again in the futuice shelves, unstable ice thicknesses would cause the grounded West Antarctic Ice Sheet to retreat rapidly again in the futuice thicknesses would cause the grounded West Antarctic Ice Sheet to retreat rapidly again in the futuIce Sheet to retreat rapidly again in the future.
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.