Large “sinkholes” – one of which can feed an entire urban area consisting of six -story buildings – are visible on the Arctic ocean surface, as permafrost melts down and contaminates the where, scientists know.
But even for man air change normal temperatures are rising to Arcticthe molten permafrost is doing these things the risks There seems to be something else wrong – the earth’s water systems are hot, moving slowly.
Arctic permafrost beneath Canada’s Beaufort Sea has been extinct for about 12,000 years, since the end of the year. last winter, when molten water from glaciers covered the land. To this day, the ice sheet is hidden from the eyes of scientists. This remote part of the Arctic was found by researchers on ships as the climate changed so that sea ice would return, the researchers said.
Map of the sea
Entering the area, the researchers relied on ship sonar and a separate underwater vehicle (AUV) to eliminate the high bathymetric measurements of the Beaufort Sea Canada.
“We know there’s a lot of change across the Arctic, but this is the first time we’ve been able to put the technology on to see the changes happening overseas,” said Charlie Paull, a geologist at Monterey Bay Aquarium Research Institute (MBARI). )) ,, spoken in a language. “While the underwater depths that we see are the result of a long, glacial-interglacial cycle, we find that the Arctic is much warmer than the rest of the Earth,” Paull said. who led the research with Scott Dallimore from the Geological Survey of Canada and Natural Resources Canada, along with a team of global researchers.
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When researchers first began conducting underwater measurements on land in 2010, they focused on the side and slope of the Beaufort Bay Canada. About 110 miles (180 kilometers) from the coast, they saw a 59-mile-long (95 km) group of rugged terrain on the seabed. That side of the fish was at the edge of the Pleistocene permafrost during the last ice age. The group wondered why the sea was so bad.
To understand how this disease develops over time and why, the team conducted three new studies, using AUVs in 2013 and 2017 and then sending sonar in 2019. and various clusters. The volcano as the largest sinkhole is 738 feet (225 m) long, 312 feet (95 m) wide and 92 feet (28 m) deep, the researchers said.
Fall class
Here’s how the researchers think the circular holes are coming out: While the heat melts beneath the Arctic Shelf, it becomes an area filled with a solid layer (an iceberg). Then the skin layer falls into that fluid -filled space; These ocean features are in the long run, the researchers said.
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In some areas, where the release of this warm groundwater is limited, seawater stays cool on the floor so that groundwater can be released again as soon as possible. in sediments close to the skin. That ice sediment is enlarged, flying upwards to form small conical mounds called pingos. These dry mounds that were destroyed by the tombs are responsible for the kind of damage that the researchers first saw in their research.
Research has also shown that sinkholes increase over time. “The continued growth of some hearts seen over a number of studies shows that the growth of these hearts is part of the process,” the researchers wrote in their research article was published online March 14 in the journal. Proceedings of the National Academy of Sciences.
For some reason, researchers say the slow climate changes associated with the end of the last frost year – which lasted for many years – were the culprits that started the cycle. When the melted soil begins to melt, the water of the molten soil from that melted permafrost will melt up on the side of the ice permafrost, leading to melting. recurrence of those sediments on top. The process continues in this way to produce many divots.
Originally published on Live Science.
