As a result of the ice in Greenland, the iron-smoky iron asteroids, about 12,000 years ago, were discovered.The crater resulting from the collision remained hidden under the 800-meter ice cap, with a width of 30 kilometers.
Recently, an ultra-wideband radar system developed in the United States based at Kansas University (KU) has been developed by the CRAIS. Characteristics of the crater, the effects of glaciers in the Huiatta, located in the far north-west of Granada, are published in the journal Science Advances.
Data from the NASA program on the Aral Sea Climate Assessment for 1997 to 2014 and NASA's IceBridge service, and compiled by the multi-channel probe radiolocation data collected in May 2016. depth (MCoRDS), developed in KU.
"We have accumulated radar data over the last two decades, and collected this information to create a map of the Glendale-like glacial ocean," said John Padden, Associate Professor of Electrical Engineering and Science. Calculation in Associated Professors at KU and CReSIS.
"Danish researchers looked at the map and saw a huge crunch similar to a crater under the ocean floor and noticed satellite imagery, Because the crater is on the edge of the ice sheet, you can see the round shape. Based on this discovery, in May 2016, a full-radar survey was conducted with the new Cursled Radar Radar for the Alfred Wegener Institute in Germany, "he added.
Patren helped develop MCORDS software for the radar signal processing, which, according to its criterion, is relatively low at low altitudes to reflect its dimensions.
"You can see the round structure on the edge of the ice sheet, especially when it's high enough," he says. Most crater does not appear in the plane window. Using satellite imagery, you can actually see the entire crater in these pictures, with a lower angle, focusing on the mountains and valleys around the ice slopes. «
To confirm the satellite and radar data, the research team poured water into the craters and further investigated the sediments of the larger river bed. The paper also states that there are "quartz and other cereal crops" that are affected by glass. Researchers believe that these rocks and grains can be formed from grain absorption in metasymal rocks.
Identify the date of the shock
The work continues to accurately determine the time of action of asteroid in Greenland. The authors spoke about this There is evidence to suggest that Hiawatha's effect was originated in the Pleistocene, because this age corresponds to the currently available data concept. However, even in this wider scale, time remains "uncertain." The crew in the southwestern part of the crater found a region rich in rubbish that could help reduce the impact.
"This will allow the climate and the atmosphere to be flooded with potential for defrosting, so there may be a sudden flow of fresh water between Canada and Greenland between the Nesnes River, which is likely to affect the ocean flow in that region," says Padden. The evidence suggests that the Greenland ice sheet was formed after the formation, but the research team still works. «
According to planetary geologist David Tovar, The opening of the crater in Greenland shows that there are several regions of the planet, which can keep the arguments of impressive craters. "In many cases, these structures are ignored by geologists because of their insufficient knowledge of their educational process and the types of materials that affect the different types of asteroids," said the expert. .
"It's a great help when you want to learn the structure of the effects that can be acquired in the form of certain material, which corresponds to the purchase of remote sensing data (satellite imagery, aerial photography, geophysics)," he continues. in this case the ice ".
The goods tell about it This work should gather evidence from the hands of scientists with knowledge of planetary geology, "That is, the samples of the rocks that have been modeled in the laboratory can be analyzed at a later stage are the ultimate goal of combining basic knowledge of different scales: mega, macro and microscopy. Year of work and less work should be avoided ".