Sentences with phrase «glacier ice much»

Colin Summerhayes of the Scott Polar Research Institute in Cambridge said three - degrees of warming would melt polar and glacier ice much further and faster than currently expected, potentially raising sea levels by two metres by 2100.

Not exact matches

Greenland's coastal glaciers and ice caps have passed a pivotal tipping point — a new study concludes that they've melted so much that they're now past the point of no return, and it's unlikely in current conditions that they'll be able to regrow the ice they've lost.

Howat and his team were able to figure this out by creating high - resolution topographic models of the glaciers and their boundaries, as well as a numerical model of exactly how much water was flowing off these coastal glaciers and ice caps — technology that wasn't available back in 1996.

Much of the world's water is stored in glaciers and the great polar ice sheets.

Much of his research career has focused on glaciers and lake ice, work that is highly interdisciplinary in nature, incorporating geology, physics, and meteorology.

For glaciers that extend from low to high elevation, measurements taken at the low end — the glacier's «snout» — may not tell scientists much about how the same ice sheet is behaving higher up the mountain.

When it's cold enough to form ice shelves that extend over the Antarctic land mass and into the ocean, much of what drops to the seafloor is sand and gravel that the glacier has picked up on its slow march from the continent's ice cap.

Scientists still do not know what triggers the breakup of an ice shelf or when future ones will occur, so they struggle to estimate how quickly glaciers will dump their ice into the ocean and therefore how much sea level will rise.

During ice ages, which are mainly driven by rhythmic variations in Earth's orbit and spin that alter sunlight in the Northern Hemisphere, growing ice caps and glaciers trap so much frozen water on land that sea levels can drop a hundred meters or more.

The Great Lakes were shaped by ice ages that sent glaciers sweeping over much of the northern hemisphere.

Much of the dust deposit east of the Rockies arrived in the last ice age, which ended some 11,000 years ago, when particles that had been ground up and transported by glaciers were deposited by meltwater streams.

SPEED UP The collapse of West Antarctica's glaciers may be unavoidable, and the ice sheet's demise could raise global sea level by as much as 4 meters, researchers reported.

But when blocks of ice topple off the front of glaciers into the water, much like swimmers doing cannonballs into a pool, the impact resonates and is picked up by sensors.

But scientists increasingly attribute much of the observed grounding line retreat — particularly in West Antarctica — to the influence of warmer ocean water seeping beneath the ice shelves and lapping against the bases of glaciers, melting the ice from the bottom up.

All told, if the eastern and western Antarctic ice shelves were to melt completely, they would raise sea levels by as much as 230 feet (70 meters); the collapse of smaller shelves like Larsen B has sped up the flow of glaciers behind them into the sea, contributing to the creeping up of high tide levels around the world.

It is not clear yet how much of the phosphorus being released from the ice sheet is reaching the open ocean, but if a large amount of phosphorus coming off the glacier makes it to the sea, the nutrient could rev up biological activity of Arctic waters, according to the study's authors.

Drawing on odd, icy - looking landforms in earlier images, he and colleagues proposed in 2003 that in the geologic past, snow - fed glaciers and ice fields had covered much of the lower latitudes of Mars at the expense of the polar ice caps (Science, 11 April 2003, p. 234).

That warm ice could slowly rise and flow, much like glaciers on Earth, but it would present a daunting barrier to life.

«If ice caps and glaciers were to continue to crack and break into pieces, [the amount of] their surface area that is exposed to air would be significantly increased, which could lead to accelerated melting and much - reduced coverage area on the Earth,» Buehler said in a statement.

But the data Rapley presented show that glaciers within the much larger west Antarctic Ice sheet are also starting to disappear.

However, Khazendar and Scheuchl said, researchers need more information on the shape of the bedrock and seafloor beneath the ice, as well as more data on ocean circulation and temperatures, to be able to better project how much ice these glaciers will contribute to the ocean in a changing climate.

The land bridge forms during ice ages, when much of the water on the planet becomes part of growing continental glaciers, making the sea level much lower than it is today,» explained Shapiro.

Professor Poinar continues, «Mammoths were much better at adapting to new habitats than we first thought — we suspect that subgroups of mammoths evolved to deal with local conditions, but maintained genetic continuity by encountering and potentially interbreeding with each other where their two different habitats met, such as at the edge of glaciers and ice sheets.»

A new study has found geochemical clues near the summit of volcanic Mauna Kea that tell a story of ancient glacier formation, the influence of the most recent ice age, more frequent major storms in Hawaii, and the impact of a distant climatic event that changed much of the world.

The global mean temperature rise of less than 1 degree C in the past century does not seem like much, but it is associated with a winter temperature rise of 3 to 4 degrees C over most of the Arctic in the past 20 years, unprecedented loss of ice from all the tropical glaciers, a decrease of 15 to 20 % in late summer sea ice extent, rising sealevel, and a host of other measured signs of anomalous and rapid climate change.

The research published in Nature Communications found that in the past, when ocean temperatures around Antarctica became more layered - with a warm layer of water below a cold surface layer - ice sheets and glaciers melted much faster than when the cool and warm layers mixed more easily.

Either the glaciers would have to flow into the ocean at unrealistic rates, or rapid melting would have to be triggered over a much larger area of the ice sheet than current evidence suggests.

I would then of course point out that the melting is occuring much more quickly than we anticipated, at least in the case of the Arctic sea ice, Greenland's glaciers and the Western Antarctic Peninsula.

There is so much ice there, just one glacier like the Totten glacier can raise global mean sea level by over one meter.

The tour is laid out in three themed, two - hour documentary film blocks, featuring Ice Call by Sam Favret, showing a surreal landscape inside glaciers, to the hilarious Owl Dance - Off Part II, the much - anticipated follow - up to wildlife photographer Megan Lorenz's award - winning Internet sensation that made stars of two burrowing owls.

Franz Josef glacier offers an inviting world of aqua blue ice and much to be explored by adventurous travellers.

Which leads me to another question — the melting glacial / Greenland / Antarctic ice water is depleted in CO2 (check out the bubbles in your ice cubes)-- how much additional CO2 is being sequestered by this runoff into the oceans, and what happens to CO2 increase when we run out of glaciers?

This in combination with the drop in greenhouse gases has resulted in the acceleration of the existing ice age; now self - perpetuating as glaciers have a much higher albedo.

I would then of course point out that the melting is occuring much more quickly than we anticipated, at least in the case of the Arctic sea ice, Greenland's glaciers and the Western Antarctic Peninsula.

However, the idea is simple, and I've talked about this much in many presentations this winter: Take the amount of ice you need to get rid of from Greenland to raise sea level 2 m in the next century, reduce it by your best estimate of the amount that would be removed by surface mass balance losses, and try to push the rest out of the aggregate cross-sectional area of Greenland's marine - based outlet glaciers.

Warmer times have generally had much higher seas and smaller ice sheets and glaciers.

Striking how this blog talks about polar bears, hurricanes, melting glaciers, melting sea ice, disappearing frogs, intelligence estimates, the snows of Kilimanjaro, drought, famine, insect infestations, too much rain, lack of rain, and who knows what else, and links it all to AGW.

The Arctic sea ice melting out above 75N would have almost no impact at all if that is the forcing change of glaciers down to Chicago and sea ice down to 45N (at lower latitudes where the Albedo has much more impact).

OCEANS RISING FAST, NEW STUDIES FIND Melting ice could raise levels up to 3 feet by 2100, scientists say David Perlman, Chronicle Science Editor Friday, March 24, 2006 Glaciers and ice sheets on opposite ends of the Earth are melting faster than previously thought and could cause sea levels around the world to rise as much as three feet by the end of this century and 13 to 20 feet in coming centuries, scientists are reporting today.

These glaciers already contribute significantly to sea level rise, releasing almost as much ice into the ocean annually as the entire Greenland Ice Sheice into the ocean annually as the entire Greenland Ice SheIce Sheet.

Gavin suggests Maunder was mild at only -.3 C but Richard Alley, historical records, glacier movement, migration patterns, clothing trends, crop records, ice cores suggest a much deeper NH dip in temps (1 - 2C).

The article says they are planning to seek formal approval from Pope Benedict XVI to update the 19th - century vow, which still focuses on avoiding catastrophes related to too much ice, to call for the glacier's return.

Since very little moisture evaporates from ice, the snowfalls become much lighter — and far to the south the glacier front comes to a stop.

In a study of eight Antarctic glaciers, they found that speeds of descent increased by as much as a factor of eight after the loss of the Larsen B ice sheet.

However, as Timothy explained in # 121, in addition to the direct sea level rise that occurs when ice shelves melt, there is a much larger secondary effect, in that ice shelves act as a brake, greatly reducing the rate of flow of the glaciers behind them from the land to the sea; and when ice shelves melt, the rate of glacier flow increases quite rapidly.

Xinjiang's ban on glacier tourism in north - western China will do little to reverse the loss of ice caused by climate change — a crucial source of water for the country and much of Asia, writes Liu Qin

The great weight of the continental glaciers during our last ice age, applied such great pressure that it forced meltwater to into the ground at much greater rates than currently observed recharge.

The data indicated that large glaciers can alter their ice discharge at timescales less than a decade, much faster than previously thought (Joughin et al. 2004).

For most of the 2000s, satellite data shows the glaciers lost about as much ice as they gained, meaning they stayed roughly stable.

During the last ice age much of the northern hemisphere was covered in ice and glaciers, and, as this map from the University of Arizona shows, they covered nearly all of Canada, much of northern Asia and Europe, and extended well into the United States.»]