Scientists have recorded the horrible "singing" of the Antarctic Ross Ice
Scientists call it "singing", but on our hearing the sounds produced by the Antarctic glaciers are more like the soundtrack to a head of a horror movie. Researchers at the American Geophysical Union, recorded this terrible rumble, they say that it is created as a result of loud vibrations. Those, in turn, come under the influence of strong winds that blow across the ice shelf dunes. About the study wrote Geophysical Research Letters journal.
geophysicist and mathematician Julien Chaput of Colorado State University said that drone has a very low frequency, so that it can be heard in a natural way, so scientists have recorded accelerated and it 1,200 times. You want to hear the sound of Antarctica? Enjoy.
Of course, the main purpose of Chaput and his team was not in a terrible record the soundtrack for the horror movie. Scientists conducting an investigation of the physical properties of the Ross Ice Shelf - the largest floating chunk of Antarctic ice on the area a little less in Spain.
With the increase in the average global temperature is the destruction of the Antarctic ice shelf. To understand what forces are taking part in it, Chaput and his colleagues found under the snow cap that rests on the surface of the Ross Ice Shelf, 34 seismic sensor. With these sensors the end of 2014 and 2017 on top was hosted monitoring shelf internal structural changes. When the researchers analyzed the data collected, they found that the snow cap covering the glacier and is called firn layer (composed of the settled dense, grainy and partially recrystallized years of snow) is in constant motion due to the influence of surface winds.
"We found that the shelf under the influence of strong winds that blow across the icy dunes, responds to this constant" singing "with a frequency of five or more cycles per second", - says Chaput.
The researchers also note that changing wind force (eg due to storms) as well as temperature changes affect not only the vibration of the snow layer, but also in the tone of the seismic rumble.
Power Cabling seismometers
"Changing the wind speed and temperature readings are recorded on the force and vibration tone, breaking the ice dunes. These two forces are responsible for the "singing" of the shelf "- Chaput explains.
According to the scientists, the study of the characteristics of these vibrations can help them better understand how glaciers respond to global temperature changes.
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