Sentences with phrase «changing glacier flow»

Not exact matches

Since overall the changes heat the Earth, the glaciers from which major rivers flow are melting.

Studying surging glaciers could also offer insights into grander - scale ice flows with global consequences: the movements of the ice sheets in Antarctica and Greenland, which can change abruptly, altering the ice discharges that affect sea level.

Changes in mass, rather than height, control how the ice shelves and associated glaciers flow into the ocean,» Paolo said.

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 glaciers.

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?

The study reports that glaciers flowing to the coast on the western side of the Peninsula show a distinct spatial correlation with ocean temperature patterns, with those in the south retreating rapidly but those in the north showing little change.

A study published in February also documented changes in the glacier's flow rate, indicating that little - studied ice shelves are starting to get more attention as scientists» understanding of ice and satellite coverage improves.

Their observations were that the region of lightly grounded ice at the glacier terminus is extending upstream, and the changes inland are consistent with the effects of a prolonged disturbance to the ice flow, such as the effects of ocean - driven melting.

Among these physical changes are increases in heavy downpours, rising temperature and sea level, rapidly retreating glaciers, thawing permafrost, lengthening growing seasons, lengthening ice - free seasons in the oceans and on lakes and rivers, earlier snowmelt and alterations in river flows.

There was an interesting study in Nature Geoscience last Sunday showing pretty clearly that the accelerating flow of the Jacobshavn glacier in recent years was most likely driven by an influx of warm deep seawater, and that shift was likely due to changes in pressure and wind patterns over the North Atlantic Ocean.

In central east Greenland, no flow change is detected on Daugaard - Jensen (Fig. 2E) and Vestfjord glaciers (area 9) in 1996 to 2005.

Examination of recent rapid supraglacial (i.e. on the surface) lake drainage documented short term velocity changes due to such events around 10 %, but little significance to the annual flow of the large glaciers outlet glaciers (Das et.al, 2008).

Changes on fast - flow marine - terminating glaciers contrast with steady velocities on ice - shelf — terminating glaciers and slow speeds on land - terminating glaciers.

The model will be used to access the impact of glacier change on river flows, irrigation and agriculture in the Himalayas and the Indo - Gangetic plain.

In a recent paper in press in the Journal of Glaciology Ian Howat and others examined changes in terminus position, surface elevation and flow on 32 glaciers along the southeast coast of Greenland from 200-2006.

The additional processes included in the JULES model will provide a more complete picture of water resources of South Asia than previously possible, allowing quantitative analysis of the effects of changes in river flow and glaciers on water resources and the implications of these changes on water availability for irrigation and therefore crop yields.

«We all have very nasty fears that the flows of the Indus could be severely, severely affected by glacier melt as a consequence of climate change.

You can't fake spring coming earlier, or trees growing higher up on mountains, or glaciers retreating for kilometres up valleys, or shrinking ice cover in the Arctic, or birds changing their migration times, or permafrost melting in Alaska, or the tropics expanding, or ice shelves on the Antarctic peninsula breaking up, or peak river flow occurring earlier in summer because of earlier snowmelt, or sea level rising faster and faster, or any of the thousands of similar examples.

Howat and others (2008) examined changes in terminus position, surface elevation and flow on 32 glaciers along the southeast coast of Greenland from 2000 - 2006.

Glaciers move horizontally as they flow downstream, the study describes, but their floating portions also rise and fall vertically with changes in the tides.

Traditional field methods are combined with remote sensing techniques to track changes in mass, geometry and the flow behaviour of the two glaciers.

Reports from scientists monitoring the situation indicate that a chuck of ice the size of Manhattan (100 sq. kilometers) is about the fall off, with the suspected cause being at least partially to do with increasing flows of warm water moving up the coast due to the region's changing climate, New Scientist reports.Large chunks of ice break off the Petermann glacier all the time, but with a chunk this size breaking away — this 5 billion tons of ice is about half of the glacier's annual flow — it's unlikely that current rates of snowfall elsewhere on the glacier will be able to make up for it.

The observed effects of cryosphere reduction include modification of river regimes due to enhanced glacial melt, snowmelt advance and enhanced winter base flow; formation of thermokarst terrain and disappearance of surface lakes in thawing permafrost; decrease in potential travel days of vehicles over frozen roads in the Arctic; enhanced potential for glacier hazards and slope instability due to mechanical weakening driven by ice and permafrost melting; regional ocean freshening; sea - level rise due to glacier and ice sheet shrinkage; biotic colonisation and faunal changes in deglaciated terrain; changes in freshwater and marine ecosystems affected by lake - ice and sea - ice reduction; changes in livelihoods; reduced tourism activities related to skiing, ice climbing and scenic activities in cryospheric areas affected by degradation; and increased ease of ship transportation in the Arctic.

The issue on Greenland is not so much increased net melting, which doesn't seem to have changed that much, but acceleration of oceanward flow of many of the southern Greenland glaciers, due perhaps to meltwater flowing through moulins down to base rock, which it lubricates.

«Widespread mass losses from glaciers and reductions in snow cover over recent decades are projected to accelerate throughout the 21st century, reducing water availability, hydropower potential, and changing seasonality of flows in regions supplied by meltwater from major mountain ranges (e.g. Hindu - Kush, Himalaya, Andes)...»