Sentences with phrase «under the ice sheet»
The land under the ice sheet also adds another wrinkle.
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They discovered that the mud originated from rocks that are currently hidden under the ice sheet.
Probably the fraction under ice sheets was around half.
The vast majority of land not under the ice sheet is rock and permafrost in the far north.
According to the NASA press release, the study «adds evidence that a geothermal heat source called a mantle plume lies deep below Antarctic Marie Byrd Land, explaining some of the melting that creates lakes and rivers under the ice sheet.»
This entry was posted on Wednesday, August 15th, 2012 at 9:56 am and is filed under ice sheet melt factor.
This entry was posted on Saturday, August 4th, 2012 at 2:00 pm and is filed under ice sheet melt factor.
Although no one is sure how often blooms occurred under ice sheets in the past, they will probably come earlier in the year as the ice sheet thins and completes its summer cycle sooner, Arrigo says.
For the first time, an active volcano has been spotted rumbling away under the ice sheet of west Antarctica.
Usually, narwhals will escape natural predators such as killer whales by stealthily slipping under ice sheets or huddling in spots too shallow for their pursuers, Williams says.
But microscopic phytoplankton, which rely on the sun for their nutrients and form the base of Arctic food webs, have managed to thrive under ice sheets that are thinning as the poles become warmer.
Scientists worry about West Antarctica because the ground under its ice sheet sits below sea level.
Bamber says that the hidden canyon helps to explain why Greenland does not have any lakes trapped under its ice sheet.
Understanding microbial life and the mineral breakdown that it incites under the ice sheet could help answer some momentous questions about whether global warming will speed up as Antarctica's ice recedes.
Bell said she and her colleagues believe that water under the ice sheet refreezes in two ways.
Using all available geologic, tectonic and geothermal heat flux data for Greenland — along with geothermal heat flux data from around the globe — the team deployed a machine learning approach that predicts geothermal heat flux values under the ice sheet throughout Greenland based on 22 geologic variables such as bedrock topography, crustal thickness, magnetic anomalies, rock types and proximity to features like trenches, ridges, young rifts, volcanoes and hot spots.
When they retreat, they leave behind a freshly polished, pristine landscape that is markedly different from land that has not been buried under an ice sheet.
«It's like a big beach ball under the ice sheet pushing up on it, and the only way to keep it submerged is if the ice sheet is strong,» said Hemingway, a doctoral candidate in planetary geophysics at UCSC and lead author of the paper.
We suggested that, given the documented flow of water beneath the ice sheet, perhaps sub-glacial rivers carried in the microbes, and Tranter responded, «People would have laughed at you a decade ago, but there is a river system under the ice sheet.
One of the reasons Greenlanders want go beyond the Home Rule system it has been governed under is to get control of the oil and natural gas reserves under the ice sheet that covers more than 80 percent of the country.
The research involved measurements of sea ice thickness made by upward - looking sonar aboard naval submarines operating under the ice sheet.
This is because there is not a topographic low under the ice sheet that funnels the flow.
Christian Schoof, from the University of British Columbia and the study's author, explains that steady flows of meltwater can be accommodated by existing channels under the Ice Sheet, but rapid flows can not:
A new NASA study adds evidence that a geothermal heat source called a mantle plume lies deep below Antarctica's Marie Byrd Land, explaining some of the melting that creates lakes and rivers under the ice sheet.
Under the ice sheet the methane became stored as hydrate, a solid form of frozen methane.
Finally, this study does not consider any contribution of methane from methane hydrates, either from under permafrost or under ice sheets, nor from fossil methane currently trapped under an impermeable seal of continuous permafrost.