Sentences with phrase «ice ablation»

Ludicrous as it may sound to you, a rigorous system model of the effect upon surface temperatures from albedo changes due to snow / ice ablation will not have any feedback loop whatsoever back to the fundamental input of insolation.

Surface ablation and basal ice ablation are determined by the climatic and oceanographic conditions at near the glacier front.

This is corroborated by ice ablation data from an ice mass balance buoy (Figure 2) that was deployed in April near Barrow and has moved through the Chukchi Sea.

From July - September glaciers are the primary area of residual snow and ice ablation.

Not exact matches

In effect, this UAV survey across the ablation zone of the ice sheet perfectly bridges the gap between people on the ground studying what's under their feet in just one part of the ice sheet, and the satellite data that shows what's going on across the entire ice sheet.

The Dark Zone is a literally dirty belt of the melting area — the ablation zone — of the ice sheet.

Researchers have attributed glacial decline to increasing temperatures, which have reduced the period of glacial accumulation and extended the period of summer ice melting (ablation).

Our work at Alexander Island is supported by the British Antarctic Survey and involves analysis of valley glacier and ice - shelf moraines at Ablation Point Massif and Fossil Bluff.

This week, the institute announced that Greenland's ablation season, the period when its ice sheet loses more mass from melting along its edges than it does from snowfall in its interior, started on June 6.

The Greenland, and possibly the Antarctic, ice sheets have been losing mass recently, because losses by ablation including outlet glaciers exceed accumulation of snowfall.

This is because a bit of extra heat in summer is a very efficient way to get rid of ice...» applies equally to what appears to be happening with respect to ablation on the low altitude edges of the Greenland Ice Sheice...» applies equally to what appears to be happening with respect to ablation on the low altitude edges of the Greenland Ice SheIce Sheet.

If significant area becomes an ablation zone, then once the previous winters snow has melted, the surface is composed of old ice, which every year becomes older than the last.

In their Kilimanjaro modelling, Moelg and Hardy adjusted the albedo model to give values more like those of clean Antarctic ice, and get reasonable - looking ablation with these values.

However, there is both theoretical and observational evidence that melting now occurs on the horizontal surfaces of the Kilimanjaro Northern Ice Field, and contributes to ablation [Moelg and Hardy 2004; Thompson et al 2002].

Even the admirable Revkin doesn't get it quite right: On horizontal surfaces, observations and modeling show a role for melting in both the baseline ablation and the sensitivity of ablation to precipitation and temperature; melting is the dominant ablation mechanism on vertical ice cliffs; and though Kaser et al find «no evidence» about rising temperatures, it is only because the in situ studies don't cover a long enough period to detect trends.

I'm also intrigued by Raymo's idea that an important factor is that during recent glacial cycles, the ablation zone of N.Hem ice sheets is land - based but that of S.Hem ice is ocean - based.

Runoff from steep ice - cliffs, or through subglacial flow driven by water percolating through pores or fractures, will convert a high fraction of melting into ablation.

Other pages display maps of individual glaciers, with white regions indicating the «accumulation zone,» where snow falls and adds to the mass, and gray stippled areas showing the «ablation zone,» where melting eats away at the ice.

[Response: Ice sheets are in equilibrium in a stable climate exactly because ablation (melt, in simple terms) balances accumulation (i.e. snowfall).

In the paper the authors argue that there is no evidence for a speed up of the ice marginal zone due to enhanced ablation rates, which by some people was explained as if Greenland was not contributing to sea level change any more.

«Large and Rapid Melt - Induced Velocity Changes in the Ablation Zone of the Greenland Ice Sheet.»

So long as an ice sheet gains an equal mass through snowfall as it loses through melt, ablation, and calving from glaciers and ice shelves, it is said to be in balance.

Ice lost by ablation is readily replaced by the freezing of rain, snow and meltwater.

Therefore, the processes of accumulation and ablation are the physical link between glaciers and climate, which explains why these ice bodies are such valuable tracers of climate variability on the scale of decades and centuries.

Annual ice and firn ablation (firn and ice net balance: Mayo et al., 1972) is determined using ablation stakes drilled into the glacier surface and simultaneously checked on the same date in late September.

In the North Cascades the ablation surface of the previous year is always marked by a 2 - 5 cm thick band of dirty firn or glacier ice.

Comparison of ablation rates and onsite temperature records in the case of the South Cascade Glacier, Easton Glacier, Ice Worm Glacier and Columbia Glacier yield a relationship between air temperature and daily ablation for snow and ice in SWE (Figure Ice Worm Glacier and Columbia Glacier yield a relationship between air temperature and daily ablation for snow and ice in SWE (Figure ice in SWE (Figure 1).

Annual balance is the difference between annual snow accumulation and snow - firn - ice melt (ablation).

An ablation triangle consists of three stakes driven or drilled into the ice at 3 m spacing forming an equilateral triangle.

Equilibrium line - The boundary between the region on a glacier where there is a net annual loss of ice mass (ablation area) and that where there is a net annual gain (accumulation area).

Recent research indicates it may be related to increasing friction at the base of the ice sheets slowing ablation and allowing greater thicknesses.

When it is warm, ice melts faster and the glacier will retreat until it reaches a new equilibrium between accumulation and ablation.

Accumulation and ablation both primarily take place during the warm season and the formation of superimposed ice on this continental - type glacier is important.

On Columbia, Daniels, Foss, Ice Worm, Lower Curtis, Sholes, and Yawning Glacier thinning is not notably less in the accumulation zone than the ablation zone, indicating disequilibrium (Pelto, 2006).

Increased ablation even in a single summer will cause thinning near the ice front.

D denotes change in ice discharge while SMB denotes the net surface mass balance (accumulation minus ablation).

It explains why, in glaciers that are mostly cold, the ice at high altitude in the accumulation zone is usually warmer than the ice at lower altitude in the ablation zone.

Alternatively, significant ablation of the Greenland ice sheet greatly exceeding even the most aggressive of current projections would be required.

Ablation stakes made of plywood strips 10 - cm wide and marked with alternating black and white 10 - cm squares are planted in the ice near the buoy to indicate visually the amount of surface melting as the summer proceeds.

Ablation stakes are used to measure the amount of firn and ice lost beneath the previous winter's snowpack.

The Whitechuck Glacier has simply not been happy with the 1.4 o F warming the North Cascade region has experienced since the 19th century, and its reduced income in the form of reduced accumulation, and increased expenditures in the form of increased ablation have led to a negative balance in its glacier ice savings account.

Mass balance (of glaciers, ice caps or ice sheets)- The balance between the mass input to the ice body (accumulation) and the mass loss (ablation, iceberg calving).

A question we'd like to be able to answer well is whether the balance between accumulation of snow and ice and ablation (melting, sublimation, and loss of ice to the ocean via iceberg calving) is positive or negative.

The papers do not address the total mass balance of the ice sheets, and the authors admit that the ablation at the edges may offset the gains on the interior.

A recent article in Science has an alarming title: «Large and Rapid Melt - Induced Velocity Changes in the Ablation Zone of the Greenland Ice Sheet.»

The portion reflected (called the albedo) is affected by precipitation and ablation, because fresh snow is more reflective than old snow or ablating ice.

van den Broeke, M. R., C. J. P. P. Smeets, and R. S. W. van de Wal (2011), The seasonal cycle and interannual variability of surface energy balance and melt in the ablation zone of the west Greenland ice sheet, Cryosphere, 5, 377 — 390.