Sentences with phrase «history of the ice sheet»

But now everything's fixed, and we're getting good cores that will help reveal the history of the ice sheet that last covered this bay.

A wealth of historical imagery exists for Greenland, and scientists could use this data to develop even more detailed histories of the ice sheet, and to determine whether the Greenland Ice Sheet was at equilibrium — not losing or gaining mass — in recent times.

Not exact matches

The plume has been a factor in the ice sheet's behavior throughout its history, and recent surges in melting are the result of all the additional heat humans have pumped into it.

Scientists may also become able to distinguish between different scenarios sooner by studying the physics of local ice - sheet changes and refining reconstructions of changes during warm periods in geological history.

«3 - D view of Greenland Ice Sheet opens window on ice history.&raqIce Sheet opens window on ice history.&raqice history.»

Now Corbett, Shakun, and others are applying this isotope technique to additional cores taken from around the coast of Greenland to get a more complete and in - focus picture of the whole ice sheet's long history.

Two studies open deep history of Greenland's ice sheet, and raise new questions about its stability.»

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.

In the mid-1990s, a lake containing 1,300 cubic miles of water (as much as Lake Michigan) was detected 12,000 feet below the surface of the ice in East Antarctica, beneath where the Russians had spent years drilling into the ice sheet to study its history.

And in the lake bed sediments, the team will search for records of the poorly understood history of the West Antarctic Ice Sheet, potentially revealing how the mighty glacier has waxed and waned over time.

«It turns out that for much of the East Antarctic Ice Sheet's history, it was not the commonly perceived large stable ice sheet with only minor changes in size over millions of years,» he saIce Sheet's history, it was not the commonly perceived large stable ice sheet with only minor changes in size over millions of years,» he Sheet's history, it was not the commonly perceived large stable ice sheet with only minor changes in size over millions of years,» he saice sheet with only minor changes in size over millions of years,» he sheet with only minor changes in size over millions of years,» he said.

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.

«East Antarctic Ice Sheet has history of instability.»

In the study, researchers analyzed a series of transient Coupled General Circulation Model simulations forced by changes in greenhouse gases, orbital forcing, meltwater discharge and the ice - sheet history throughout the past 21,000 years.

«Based on the likely location of ice deposits during this period of Mars» history, and the amount of meltwater that could have been produced by Lyot ejecta landing on an ice sheet, we think this is the most plausible scenario for the formation of these valleys» said David Weiss, a recent Ph.D. graduate from Brown and the study's lead author.

Together, these ice sheets offer researchers a comprehensive record of Earth's climate history and play an important role in the future of the global climate system.

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.

Inferring Histories of Accumulation, Ice Flow, and Ice Thickness from Internal Layers in Ice Sheets.

Our interactions with climate, for far more than 99 percent of history, ran in one direction: Precipitation or temperatures changed, ice sheets or coastlines or deserts advanced or retreated, and communities thrived, suffered, or adjusted how or where they lived.

NPR gave some of the history as found here: http://pubs.aina.ucalgary.ca/arctic/Arctic39-1-15.pdf (the ice loss has been happening for more than a century, but the last bits of the old ice age ice sheet are going fast now ``... a total of 48 square km... calved from Milne and Ayles ice shelves between July 1959 and July 1974.....»

We have fairly high confidence that we observe the history of Heinrich events (huge discharges of ice - rafted debris from the Laurentide ice sheet through Hudson Bay that are roughly coincident with large southern warming, southward shift of the intertropical convergence zone, extensive sea ice in the north Atlantic, reduced monsoonal rainfall in at least some parts of Asia, and other changes), and also cold phases of the Dansgaard / Oeschger oscillations that lack Heinrich layers and are characterized by muted versions of the other climate anomalies I just mentioned.

With a much - needed GRACE follow - on mission being planned and expected to launch around 2017, observation and modelling of Antarctic GIA will continue to give us insights into the ice sheet history — from the LGM through to the present — and hence provide the context for any future changes.

Much warmer times have also occurred in climate history — during most of the past 500 million years, Earth was probably completely free of ice sheets (geologists can tell from the marks ice leaves on rock), unlike today, when Greenland and Antarctica are ice - covered.

Unlike the formerly - glaciated regions of the Northern Hemisphere, 98 % of Antarctic bedrock remains covered by ice and the ice sheet edge is fringed by extensive ice shelves; this hampers the collection of data on ice history and introduces substantial uncertainty in reconstructions.

After a careful reassessment of climate sensitivity and climate history data, NASA climate science chief James Hansen and his colleagues concluded that the tipping point at which substantial ice - sheets on Earth will disappear is around 450ppm (+ / -100 ppm) of CO2.

Based on evidence from Earth's history, we suggest here that the relevant form of climate sensitivity in the Anthropocene (e.g. from which to base future greenhouse gas (GHG) stabilization targets) is the Earth system sensitivity including fast feedbacks from changes in water vapour, natural aerosols, clouds and sea ice, slower surface albedo feedbacks from changes in continental ice sheets and vegetation, and climate — GHG feedbacks from changes in natural (land and ocean) carbon sinks.

«In terms of public debate, the big - ticket questions have been, «What is the history of the West Antarctic Ice Sheet?»»

Arctic Ocean deep - sea record of Northern Eurasian ice sheet history.

The sediment records collected during the IODP Expedition 379 will enable scientists to better understand the glacial history of the area and the environmental impact of this enormous ice sheet.

The Quaternary glacial history of the Arctic Ocean is characterized by the repeated build - up and decay of circum - Arctic ice sheets on the continental shelves, the development and disintegration of ice shelves, and related changes in ocean - circulation patterns and sea ice cover50, 51,52,53,54,55.

In theGuardian, Suzanne Goldenberg, wrote: «The Greenland ice sheet melted at a faster rate this month than at any other time in recorded history, with virtually the entire ice sheet showing signs of thaw.»

Last glacial maximum was the period in the history of the planet when ice sheets covered significant part of the Northern hemisphere.

However, instead of digging into the soil, they look for clues about our planet's climate history by studying coral reefs, digging into ocean and lake floor sediment and drilling deeply into glaciers and ice sheets.

In Earth's history, there have been at least five major ice ages, when long - term cooling of the planet resulted in the expansion of ice sheets and glaciers.

New reconstructions of the history of ice - shelves and ice sheets / caps have also emerged (Antoniades et al., 2011; Hodgson, 2011; Kirshner et al., 2012; Simms et al., 2011; Smith et al., 2011).»

Jim D, if you and others like you aren't willing to do what must be done to greatly increase the price of carbon, then all your talk of ice sheet melting, sea level rise, climate tipping points, global temperature trends, the earth's paleoclimate history, and climate model projections — all of that talk is mere Kabuke theater.