Sentences with phrase «glacier ice over»

Forcing glacier ice over a resistant bed is an analogous problem, at least to the extent that both the bird and the glacier — usually an ice sheet — have to balance force against resistance.

Not exact matches

Light blue represents the region in which the glacier's ice front has advanced and retreated over time.

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.

The twice - daily lurches and icequakes are thought to arise from ocean tides lifting the ice so that it can slide over the sticky spot, relieving mechanical strain that has built up on the glacier since the last high tide.

The bottom few feet of ice is probably cluttered with such debris, picked up by the glacier as it slid over the hidden face of Antarctica for thousands of years.

It is very narrow, tall glaciers on either side and it happened to be one of those beautiful blue sky days and I can remember thinking over and over during that day, you know, how lucky we were to be there because I have been to that channel before and often it's big and blowy and gusty and windy because you're pushing all these [this] ice and wind through this narrow slot.

The results — along with a recent Dartmouth - led study that found air temperature also likely influenced the fluctuating size of South America's Quelccaya Ice Cap over the past millennium — support many scientists» suspicions that today's tropical glaciers are rapidly shrinking primarily because of a warming climate rather than declining snowfall or other factors.

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

Scientists have a pretty good idea of how thermal expansion and melting mountain glaciers will play out over the long term, but when it comes to the ice sheets, «we have no idea,» Willis says.

«We still don't know exactly where the meltwater came from, but given that the average temperature at the nearest weather station has risen by about 1.5 degrees Celsius (2.7 degrees Fahrenheit) over the last 50 years, it makes sense that snow and ice are melting and the resulting water is seeping down beneath the glacier,» Thompson said.

There have been thousands of small earthquakes over the past week at Bardarbunga, which is Iceland's largest volcanic system and located under the ice cap of a glacier.

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.

A glaciologist rather than a biologist, he wanted to investigate a question critical to climate change: Do subglacial rivers and lakes lubricate the movement of ice over land — and might they somehow accelerate a glacier's flow into the ocean, triggering rapid sea level rise?

Totten Glacier, the largest glacier in East Antarctica, is being melted from below by warm water that reaches the ice when winds over the ocean are strong — a cause for concern because the glacier holds more than 11 feet of sea level rise and acts as a plug that helps lock in the ice of the East Antarctic Ice Sheice when winds over the ocean are strong — a cause for concern because the glacier holds more than 11 feet of sea level rise and acts as a plug that helps lock in the ice of the East Antarctic Ice Sheice of the East Antarctic Ice SheIce Sheet.

Its floating front edge, the Totten ice shelf, sticks out like a tongue over the water and acts as a buttress for the giant glacier, slowing its movement toward the ocean.

A new study by scientists at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, California, and the University of California, Irvine, shows that while ice sheets and glaciers continue to melt, changes in weather and climate over the past decade have caused Earth's continents to soak up and store an extra 3.2 trillion tons of water in soils, lakes and underground aquifers, temporarily slowing the rate of sea level rise by about 20 percent.

These findings suggest that Greenland's glaciers have been experiencing increasing ice loss for at least three decades — a result that may reinforce scientists» concerns over the stability of the melting ice sheet.

For comparison, one of the fastest moving glaciers, the Jakobshavn ice stream in southwest Greenland, has retreated 35 kilometers (21.7 miles) over the last 150 years.

Zdanowicz drills through glaciers all over the Arctic and collects cylinders of ice containing a stack of layers.

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.»

Over the last decade, satellites have revealed the glacier is the site of the most dramatic ice loss in its West Antarctica neighborhood, a fringe of coastline just west of the Antarctic Peninsula — the narrow finger of land that points toward South America.

Although that is unlikely to happen for many thousands of years, the ice sheet has increasingly lost mass over the last two decades, and the glaciers that serve as its outlet to the sea are accelerating.

Romania's Scarisoara Ice Cave holds the world's oldest cave glacier, built up by water dripping into the cavern over thousands of years.

Monckton says «The Antarctic, which holds 90 percent of the world's ice and nearly all its 160,000 glaciers, has cooled and gained ice - mass over the past 30 years, reversing a 6,000 - year melting trend.»

Before boring into the ice, scientists studied how parts of the glacier have cracked and shifted over the years.

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.

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.

«As a result of the acceleration of outlet glaciers over large regions, the ice sheets in Greenland and Antarctica are already contributing more and faster to sea level rise than anticipated,» he observed.

Combined with melting from mountain glaciers and the Greenland Ice Sheet, this could result in flooding of low - lying areas of Earth over the next century.

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

More specifically, using digital scans of paper maps based on aerial imagery acquired by the U.S. Geological Survey, along with modern - day satellite imagery from a variety of platforms, the authors digitized a total of 49 maps and images from which they calculated changes in the terminus positions, ice speed, calving rates and ice front advance and retreat rates from 34 glaciers in this region over the period 1955 - 2015.

But its absolute nadir (possibly of the whole franchise) was the sight of then - Bond Pierce Brosnan's parasurfing over a fake CGI tsunami and crumbling ice glacier.

«Chasing Ice»: Science, spectacle and human passion mix in this stunningly cinematic portrait as National Geographic photographer James Balog captures time - lapse photography of glaciers over several years, providing tangible visual evidence of climate change.

The only modifications to the Polar Expedition variants of the production Amarok Pickups, currently being sold in South America, Australia, New Zealand, South Africa, Russia, and Europe, were long - travel heavy - duty shocks and huge tires with deep ridges to navigate the extreme amounts of snow and ice expected when driving over a glacier.

Slip on a pair of ice skates and glide over the frozen, glacier - fed waters of Lake Louise, one of the most scenic ice skating rinks in the world.

A day spent flightseeing over glaciers and ice fields is the perfect way to end your trip!

Trundling over gigantic glaciers, through burrowing tunnels and across ice cold, glimmering lakes, the Jungfrau Railway is a masterclass of structural design, navigating its way to places no other form of transport can.

The hike through the valley leads you over rocks, streams, and rivers created by the runoff of snow and the melting of ice from both the Hooker Glacier and those glaciers hanging off Mount Sefton.

On our third and final day we headed over to Tasman Glacier on a boat tour that took us on the lake for a closer look at the glacier and the «ice cubes» that had calved off of it in the prior months.

In 2002, the 12 km (7.5 mile) long floating terminus of the glacier entered a phase of rapid retreat, with the ice front breaking up and the floating terminus disintegrating and accelerating to a retreat rate of over 30 m (100 ft) per day.

As the glacier / icefjord icebergs advance with a speed of over 30 m / day, any dam (how heavy it may be made) will be pushed away by the forces behind the ice front... Not to be forgotten the harsh winter freezing there...

Alastair notes that increased water vapour will carry more energy to the surface of the glaciers, likewise these increased water flows over, through and under the glaciers is also transferring vast amounts of energy into the ice.

The lower trend found by our study is consistent with the median projected sums of thermal expansion and glacier mass loss, implying that no net contribution from polar ice sheets is needed over 1901 - 1990.

(1) One is the ice sheet and glacier mechanical collapse, which doesn't require a whole lot more warming, but will happen with some set minimum amount of warming over some time period; and (2) the other is global warming that keeps increasing beyond the level needed to cause # 1, which among other things will perhaps lead to positive carbon feedbacks (e.g., from melting permafrost and hydrates).

We're not talking about day trading here, we're talking climate and long range trends like a steady decline in sea ice over decades, shrinking glaciers world - wide, deforestation, etc..

Sea ice migrated over shipping lanes and glaciers advanced to lower than normal heights..

The influence of anthropogenic forcing has also been detected in various physical systems over the last 50 years, including increases in global oceanic heat content, increases in sea level, shrinking of alpine glaciers, reductions in Arctic sea ice extent, and reductions in spring snow cover (Hegerl et al., 2007).

Totten Glacier, the largest glacier in East Antarctica, is being melted from below by warm water that reaches the ice when winds over the ocean are strong — a cause for concern because the glacier holds more than 11 feet of sea level rise and acts as a plug that helps lock in the ice of the East Antarctic Ice Sheice when winds over the ocean are strong — a cause for concern because the glacier holds more than 11 feet of sea level rise and acts as a plug that helps lock in the ice of the East Antarctic Ice Sheice of the East Antarctic Ice SheIce Sheet.

... During the present ice age, glaciers have advanced and retreated over 20 times, often blanketing North America with ice.

The lakes are prone to floods, typically caused when the mountain glaciers that feed them shed a chunk of ice and rock, forcing thousands of gallons over the banks.