Sentences with word «meltwater»

Richard B. Alley, an expert on Greenland's ice sheet at Penn State, told me it's still possible that flows of meltwater from surface lakes could start large areas of ice moving seaward, particularly if the melt zones continue to expand inland as they have been doing for years now.

DeConto says that his study provides some «complementary» «actual numbers» to support the controversial recent result of James Hansen, who argued that truly tremendous amounts of meltwater from Antarctica later this century could trigger a feedback loop of further ice melt and throw the global climate into chaos.

Diversion of glacial meltwater from the Mississippi to the St. Lawrence was suggested by Kennett and Shackleton (1975); Johnson and McClure (1976); Ruddiman and McIntyre (1981a), p. 204 dismissed this since they saw no decrease in North Atlantic biological productivity; but later data, as explained by Broecker, supported the idea, Broecker et al. (1989).

Big cities like La Paz are partially dependent on meltwater from glaciers.

The findings also back another recent study that found that the amount of meltwater flowing into the ice sheet didn't match what was flowing out, suggesting it was being caught up somewhere in the ice.

Although the sheet's edge has not visibly moved, the extent of the «melt zone» — the translucent area dotted with meltwater ponds — along the edge is greatly expanded.

This canyon drained a large meltwater lake on the surface of the ice into a moulin, or under - ice channel that flows to the bottom of the ice sheet.

Some of the gullies that cut the sides of Martian craters were likely formed by meltwater from glaciers that existed a few million years ago, when Mars was wetter than it is now, a new study suggests.

They lost their clear turquoise colour, because there's no glacier meltwater flowing into the lakes anymore.

For a while, a shrinking glacier will contribute even more meltwater runoff to the river, but there comes a point when a smaller glacier can't keep up.

Record high temperatures in Pakistan's far north were already producing higher amounts of snowmelt and glacial meltwater runoff from the Karakoram Range and into the Indus River System.

Hence I interpret low - temperature events as meltwater pulse that swoosh past our sensor.

Dr Howat and his colleagues report in The Cryosphere that they measured a two kilometre - wide depression 70 metres deep in the icecap of southwest Greenland, which they then identified as «the first direct evidence for concentrated long - term storage and sudden release of meltwater at the bed».

As reported by Don Perovich aboard the Healy, there is widespread refreezing of surface ice meltwater as it runs through, then underneath, the ice and comes into contact with colder, more saline seawater, adding on layers of newly formed ice to the bottom of floes during the melt season.

Researchers also wonder how meltwater flows unleashed in the spring affect summer runoff.

In my view increased meltwater input isn't a write - off and it's not an impending catastrophe either.

Generally, the supply of early - summer meltwater increases as warmer temperatures get glaciers melting sooner than they used to.

Also, the sea level rise and the colossal amounts of meltwater discharged from the collapsing ice sheet meant that areas that previously were land eventually became seabed.

Since the icecap is melting as the atmospheric levels of the greenhouse gas carbon dioxide rise, and global temperatures rise with them, as a consequence of the human combustion of fossil fuels, the rate at which summer meltwater gets into the oceans becomes vital to climate calculations.

As global warming continues to impact the McMurdo Dry Valleys of Antarctica, with more meltwater streams and water tracks travelling across the landscape, more mineral phosphorus is likely to become available through rock weathering over centuries to millennia.

I don't think it is well known how much meltwater refreezes in the glacier, versus how much escapes to the oceans.

2 million people who rely on glacial meltwater supply in the dry season, and immediate danger in the short term for thousands who might live below precarious glacial lakes.

and ii) The Southern Ocean is freshening because of increased rain and snowfall as well as an increase in meltwater coming from the edges of Antarctica's land ice (Zhang 2007, Bintanga et al. 2013).

One explanation is that cold meltwater from Greenland has caused this blob.

As well as contributing to a global sea - level rise of several metres, the large volume of meltwater released to the ocean also had an effect on the climate.

«large - scale circulation changes,» Oeschger et al. (1984), p. 303; he cited Broecker (1982b); for meltwater effect he cited Worthington (1968); and in more detail Ruddiman and McIntyre (1981); in 1990 Broecker cited Oeschger's paper as the first suggestion «that the Greenland events constitute jumps between two modes of operation of the climate system,» Broecker et al. (1990).

Scientists think mantle plumes are thin streams of heated rock that makes its way upward, melting ice and creating rivers and lakes of meltwater under Antarctica's western ice sheet.

The potential effects of such processes were taken to the extreme in the 2004 movie The Day After Tomorrow, in which floating meltwater produced by warming climate caused the North Atlantic to freeze over almost instantly, in turn locking much of the United States in ice within days.

The exposure of bare ice and development of surface meltwater pools also reduces surface albedo, primarily in the near - infrared but also at visible wavelengths.

Because meltwater is less reflective than ice, the surface of the ice sheet is already absorbing more sunlight — previous research found that the reflectivity of the Greenland ice has dropped by 6 percent in the last decade, according to an Ohio State University release on the new research.

Michael Mann «Their climate model scenario wherein Greenland and Antarctic meltwater caused by warming poles, leads to a near total shutdown of ocean heat transport to higher latitudes, cooling most of the globe (particularly the extratropics), seems rather far - fetched to me.»

The story goes — warmer temperatures, more surface melting, more meltwater draining through moulins to glacier base, lubricating glacier bed, reducing friction, increasing velocity, and finally raising sea level.

In fact immediately after the release of the paper one of the authors was quoting invoking the now dead notion of the Zwally effect, that is enhanced meltwater lubrication being the key to ice accleration, as the main reason for acceleration.

This suggests that glacial ice acceleration due to changes in seasonal meltwater flux tend to not make a significant overall change in outlet glacier ice velocities.

By contrast, glaciers in intermediate conditions can easily get out of kilter, accumulating internal heat until enough meltwater builds up at their base to trigger a surge.

Fresh meltwater pouring into the ocean from Greenland raises sea level and could affect ocean ecology and circulation.

Tasman Lake is grey because of the Tasman Glacier meltwater feeding it.

Most of the water comes from glaciers providing meltwater during the summer.

Long, roughly parallel cracks score the surface, formed by water and pressure; impossibly blue lakes of meltwater fill depressions; and veiny networks of azure streams meander west, flowing to the edge of the ice sheet and eventually out to sea.