Getting a clearer view of how ice behaves is important because it will help scientists predict more accurately how the ice sheet will respond to future climate change. The results are published this week in the Journal of Glaciology.
Using phase-sensitive radar – an exceptionally accurate version of the systems used by ships and aircraft to detect objects in their path – Dr Adrian Jenkins and colleagues from BAS studied the internal structure of the enormous Filchner-Ronne Ice Shelf, as well as the rate at which the bottom of the ice shelf is melting.
Lead author Dr Jenkins of BAS says, "The radar provides an unprecedented insight into the flow of the ice shelf. Internal structures are formed as layers of snow are laid down each year. These layers produce radar reflections that give us a totally new view of the internal workings of an ice sheet. This will help us understand how the ice flows and improve our ability to predict how the ice sheet as a whole will evolve in the future, which is important because growth or shrinkage of the ice sheet has a direct impact on global sea level."
As well as shedding new light on the makeup of the ice shelf, Dr Jenkins and his colleagues used the phase-sensitive radar to measure the rate at which the underside of the ice shelf is melting. These are the first-ever direct measurements of ice shelf melting and are extraordinarily accurate. According to Dr Jenkins,
"The new technique allows us to measure centimetre-scale changes in the 2-km thickness of the ice. We found that an average of 1 m of ice is melted from the bottom of the ice shelf every year. At this rate, all the ice lost by melting can be replenished by flow of ice from upstream, so that this part of the ice shelf is showing no signs of change. Elsewhere in Antarctica ice shelves and ice streams are thinning and now we have a tool to measure the thinning rates to unparalleled accuracy."
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University of Maryland researchers contribute to historic detection of gravitational waves and light created by event
On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...
Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.
Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...
Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
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Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.
It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...
17.10.2017 | Event News
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