New led study National Aviation and Space Administration (NASA, for her acronym in English), published in the announcement Science Feedback what The rapidly growing height of the Thwaites glacier was detected with a cavity of 40 square meters and 300 meters high. "The size of the cavity under a glacier plays an important part in melting ice, as more heat and water penetrates the glacier melting faster," said lead leader study Pietro Milillo, the Refusal Laboratory Chorro (JPL, for her acronym in English).
Here's how this is glacier That and delays are considered by researchers like one of the biggest dangers in the world, due to the importance of this massive mass of ice to regulate sea level. There's about 14 billion tonnes of ice melted to form this hole, that is a striking thing Most melting in the past three years. The Thwaites glacier is currently responsible for a 4% of sea level rises worldwide and it has enough ice to increase to others 65cm if the joining process continues. It also supports adjoining glaciers that would increase an additional 2.4m at sea level if all masses have been frozen.
When the tide rises and falls into the glacier area, it does so with a line of contact with land in advance and ruin of about 3 to 5 km. Ice mass has to separate from the bed at a rate of 0.6 to 0.8 kilometers per year since 1992; although the regeneration rate in the landline remains stable, the melting rate on this side of the glacier is extremely high and worried.
The researchers were hoping to find fissures between the ice and rock at the bottom of the Thwaites glacier, but they were surprised by checking that the quantity and rate of cavity growth were much higher than expected. After this investigation, NASA highlights Need to observe in the lower part of Antarctic glaciers in order to calculate how fast the world's waters rise in the face of climate change.
Material used in the study
For the discovery, the scientists used the information provided by a radar ice penetration at Operation IceBridge of NASA (a campaign that explores links between polar regions and global climate since 2010), and also uses a series of synthetic opening radar of Italian and German space vehicles. These are High resolution data can be processed using a technique of the name of radar interferometry which is a method of measure that is relevant to the electromagnetic wave intervention phenomenon, in this case to reveal how the glacier has adapted.
Joint study of Eric Rignot of the University of California, Irvine and JPL in NASA's statement said: "For years we have suspected that this glacier was not attached to the basic rock, thanks to a new generation of instruments Finally, we can see the details. "
The problem in calculating the speed of the message
The numerical models used to calculate and simulate the edge of the glaciers were evident after this study by NASA. In those equations one takes a a static form to represent a cavity under the ice, rather than to enable it to change and grow; this is a constraint that seems to cause the results of the simulations Estimates the speed of Thwaites losing ice.