Sentences with phrase «from subglacial»

When this in turn emptied, the researchers calculated that the flow from the subglacial lake was at a rate of 215 cubic metres per second.

Does the Rintoul paper suggest the possibility of large outflowing of freshwater from below the surface, perhaps from subglacial lakes or rivers?

Debris entrainment encompasses the detachment of frozen blocks of sediment from the subglacial substrate, which is then folded and thrusted [17].

While direct samples of water from subglacial Antarctic lakes have yet to be obtained, the lower 80m or so of the Vostok ice core represents lake water that progressively freezes onto the base as the ice sheet slowly traverses the lake.

Beginning in the austral summer of 2017/2018 SALSA aims gather new knowledge about the Antarctic Subglacial Environment through sampling from Subglacial Lake Mercer.

Pearce is part of a team of British scientists that hopes to retrieve samples next year from another subglacial lake, Lake Ellsworth in West Antarctica.

Mud and sediment from Subglacial Lake Whillans makes its first supraglacial appearance in January 2013.

Not exact matches

Scherer (center) collects mud from the bottom of the subglacial lake for analysis.

At a meeting last week, scientists from Russia, the United Kingdom and the United States described their plans to explore the planet's last uncharted ecosystems by drilling into three very different examples of these subglacial lakes.

When researcher Alberto Behar from NASA's Jet Propulsion Laboratory in Pasadena, Calif., joined an international Antarctic expedition last month on a trek to investigate Subglacial Lake Whillans, he brought with him a unique instrument designed and funded by NASA to help the researchers study one of the last unexplored aquatic environments on Earth.

Ice deformation data from NASA's ICEsat, which indicates subglacial water movement, suggest that the lake has completely filled and drained twice since data - taking began in 2003.

Untersee is a good model for Mars, he says, because it is supplied by subglacial melt — water that accumulates at the bottom of an ice pile — rather than from surface melting, which does not occur on Mars.

When Duncan J. Wingham and his colleagues from University College London reviewed archived satellite records, they noticed that over a period of 16 months, the surface above an unnamed subglacial lake in the center of the East Antarctic ice sheet was sinking.

«The location of the melting strengthens the idea that freshwater from the local subglacial drainage system is responsible for the evolving ice shelf features.»

Graduate student Grace Barcheck, from the University of California in Santa Cruz, buries a seismic sensor in the ice sheet above Subglacial Lake Whillans.

«They show clearly that... the surface melt must have contributed to the rapid rise, the refilling of the subglacial lake,» Joe MacGregor, a glaciologist from the University of Texas, who was not involved in the research, said.

The continually dropping slope helps explain why northern Greenland, unlike Antarctica, has no large subglacial lakes: Meltwater that either forms at the base of Greenland's ice sheet or ends up there after draining from the ice sheet's upper surface flows away uninterrupted.

If they can obtain the satellite, Polar Broadband Systems hopes to have it in place by the next Antarctic summer — in time for Russian scientists» return to Lake Vostok to collect the first sample of water from an Antarctic subglacial lake.

The subglacial lakes were accidentally discovered through the radar data from NASA.

Rutishauser said that the salinity of the Devon subglacial lake, which is four or five times saltier than seawater, is due to the melting of the basal ice from the surrounding rock formations.

SALSA will shift its focus from the WISSARD project's study site in the Central Basin, to the more hydrologically active Southern Basin, which includes Subglacial Lake Mercer, one of the largest subglacial lakes on the ~ 12,400 m2 Whillans Subglacial Lake Mercer, one of the largest subglacial lakes on the ~ 12,400 m2 Whillans subglacial lakes on the ~ 12,400 m2 Whillans Ice Plain.

SALSA will gather data from permanent GPS stations to better understand subglacial water flow's influence on the larger ice sheet system and improve subglacial lake modeling through comparing our model's estimates against geochemical data.

Anandakrishnan, S., D.D. Blankenship, R.B. Alley and P.L. Stoffa, Influence of subglacial geology on the position of a West Antarctic ice stream from seismic observations.

Tulaczyk, S., Kamb, B., Scherer, R.P., and Engelhardt, H.F., in press, Sedimentary processes at the base of a West Antarctic ice stream: constraints from textural and compositional properties of subglacial debris: Journal of Sedimentary Research.

This current National Science Foundation - funded Whillans Ice Stream Subglacial Access Research Drilling (WISSARD) project included 12 co-principal investigators from as many institutions along with a host of graduate and doctoral candidate students.

The site of Whillans subglacial lake is about 600 miles from the group's base station at McMurdo Station.

The solution is going to come from the sources it has always come from: careful analysis of observations, which in this case are inescapably englacial and subglacial (i.e. work on the ground).

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.

In a first - of - its - kind feat of science and engineering, a National Science Foundation (NSF)- funded research team has successfully drilled through 800 meters (2,600 feet) of Antarctic ice to reach a subglacial lake and retrieve water and sediment samples that have been isolated from direct contact with the atmosphere for many thousands of years.

(2012), Ice volume and subglacial topography for western Canadian glaciers from mass balance fields, thinning rates, and a bed stress model: Journal of Climate, doi: 10.1175 / JCLI - D -12-00513.1.

So Subglacial Lake Vostok, and the beds of glaciers generally, are intensely interesting from the standpoint of the search for extraterrestrial life.

Apart from provoking us to rethink the meaning of «life», subglacial microbes have implications.

We conclude that the ice sheet surface is efficiently drained under optimal conditions, that digital elevation models alone can not fully describe supraglacial drainage and its connection to subglacial systems, and that predicting outflow from climate models alone, without recognition of subglacial processes, may overestimate true meltwater release from the ice sheet.

Deep beneath Antartica's glaciers, formed by steam from active volcanos, are extensive subglacial cave networks.

Scientists from several nations are working together to launch a flagship program to explore a major mountain range buried by a large continental ice sheet and bounded by numerous subglacial lakes.