Sentences with phrase «ice sheet surface»
In that period ice sheet surface melting increased from 40 to 97 percent.
bitsofscience.org
Greenland ice sheet surface mass balance variability (1988 - 2004) from calibrated polar MM5 output.
I have a question about the potential albedo feedback effect on a ablating ice sheet surface.
«Once the timing of equilibrium conditions for the Greenland Ice Sheet is verified, a detailed reconstruction for that period could serve as a steady - state ice sheet surface for initializing ice sheet models,» Csatho writes in the News and Views article.
The graph above shows the daily extent of melt during 2012 on the Greenland Ice Sheet surface as a percentage, compared to the average from 1981 to 2010.
a) Map of Greenland Ice Sheet surface albedo for summer (June to August) 2014, relative to the summer average 2000 - 2011, b) Average surface albedo of the whole ice sheet each summer since 2000, and c) Average surface albedo of the ice sheet each August since 2000.
Some researchers blamed ice sheet surface melt for unusually severe flooding at Kangerlussuaq, an air - transportation hub in southwestern Greenland.
The flow of news releases and background science content from NASA is generally excellent, but the space agency badly blew it earlier this week with this headline, which has now reverberated around the Web: «Satellites See Unprecedented Greenland Ice Sheet Surface Melt.»
Bai, 2009: Greenland ice sheet surface air temperature variability: 1840 - 2007, J. Climate, 22 (14), 4029 - 4049, doi: 10.1175 / 2009jcli2816.1.
Not only did Greenland Ice Sheet surface melt in 2012 occur over a bigger - than - average area, it also began about two weeks earlier at lower elevations and, for any given elevation, lasted longer.
«It's a complex system of interaction between the atmosphere and the ice sheet surface.
Stibal, M., Sabacka, M., Zarsky, J. (2012a) Biological processes on glacier and ice sheet surfaces.
They effectively remove mass from the ice sheet surface by sublimation and redistribute snow on a regional scale.
Several recent summers have seen particularly stark ice loss: At the peak of the 2012 melt season, about 97 percent of the ice sheet surface was melting — that melt season alone contributed 1 millimeter of global sea level rise.
In just a few days, the melting had dramatically accelerated and an estimated 97 percent of the ice sheet surface had thawed by July 12.
This is computed from an ice sheet surface mass balance model, with the snowfall amounts and temperatures derived from a high - resolution atmospheric circulation model.
Does sea ice influence Greenland ice sheet surface melt?
Perhaps a bit off - topic — Getting away from the ice sheet surface (and below it), I'm curious as to what kind of effects the presence of atmospheric aerosols have in the polar winter.
Heat radiates to space from the ice sheet surface.
Arctic sea ice extent reconstruction - Kinnard et al. 2011 Sea ice albedo feedback - NASA Polar jet stream - NC State University Greenland ice sheet surface melt - NASA Permafrost distribution in the Arctic - GRID - Arendal Atmospheric methane concentration - NOAA ESRL Russia plants flag at North Pole - Reuters
As this started on April 11, this surpasses the previous record for early melt of more than 10 per cent of the ice sheet surface - from May 5, 2010 - by more than three weeks.
These rising temperatures have been accompanied by unprecedented Greenland ice sheet surface melt.
To assure the model was realistic, the scientists drew on observations of changes in the altitude of the ice sheet surface made by NASA's IceSat satellite and airborne Operation IceBridge campaign.
Lakes of summer meltwater tend to form on the ice sheet surface: if the ice below fractures, these lakes can drain in a matter of hours.
The 16 July low was the lowest in the satellite observational record and coincided with 97 % of the ice sheet surface area melting.
A massive ice sheet almost completely covers Greenland, and as summertime temperatures climb and sunlight hours lengthen, parts of the ice sheet surface usually melt, especially at lower elevations near the coast.
An estimated 97 percent of the ice sheet surface melted on July 11 and 12, 2012, and virtually the entire ice sheet surface melted at some point in July 2012.
They analyzed the relationship between the growth of the algae and the amount of light being reflected by the ice sheet surface.
On average no more than half of the ice sheet surface used to experience surface thawing at the peak of the boreal summer.
I followed the link in wrsc to Satellite Data Indicates Unprecedented Greenland Ice Sheet Surface Melt.
«The grounding line is buried under a thousand or more meters of ice, so it is incredibly challenging for a human observer on the ice sheet surface to figure out exactly where the transition is,» Rignot explained in a NASA news release.
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.
«In subsequent years, meltwater couldn't penetrate vertically through the solid ice layer, and instead drained along the ice sheet surface towards the ocean,» says William Colgan, assistant professor in the Department of Earth and Space Science and Engineering at York University in Toronto, Canada.
«Meltwater couldn't penetrate vertically through the solid ice layer, and instead drained along the ice sheet surface towards the ocean»
We need to quantify and understand these feedbacks so that we can assess the energy budget at the ice sheet surface and predict future changes in ice mass.