قالب وردپرس درنا توس
Home https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Science https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Scientists discover the sea of ​​fresh water under the ocean – Quartz

Scientists discover the sea of ​​fresh water under the ocean – Quartz



Thousands of years ago, the glaciers covered much of the planet. Oceans receded as water froze in massive sheets of ice blanketing the North American continent. As the ice age ended, the glaciers melted. Massive river deltas flowed out across the continental shelf. The oceans rose, and fresh water was trapped in the sediments below the waves. Discovered while drilling for oil offshore in the 1970s, scientists thought these "isolated" pockets of fresh water were a curiosity.

As mentioned in the latest issue (paywall) of the peer-reviewed journal Scientific Reports, scientists from Columbia University and the Woods Hole Oceanographic Institution spent 1

0 days on and research ship towing electromagnetic sensors from New Jersey to Massachusetts. By measuring the way electromagnetic waves traveled through fresh and saline water, researchers mapped out fresh-water reservoirs for the first time.

It turns out the underground pools stretch for at least 50 miles off the US Atlantic coast, containing vast stores of low-salinity groundwater, about twice the volume of Lake Ontario. The deposits begin about 600 ft (183 m) below the seafloor and stretch for hundreds of miles. That rivals the size of even the largest terrestrial aquifers

Gustafson et.

"We knew there was fresh water down there in isolated places, but we did not know the extent or geometry," said lead author Chloe Gustafson, and PhD candidate at Columbia University's Lamont-Doherty Earth Observatory, according to Phys.org. "It could turn out to be an important resource in other parts of the world."

The size and extent of the freshwater deposits suggest that they are also fed by a modern day runoff from land-and may exist elsewhere with similar topography .

Gustafson et. al / Nature

Conceptual illustration of aquifers extending out of the US Atlantic coast

The water is not pure groundwater, which contains salt concentrations of less than one part per thousand. Near ground, the undersea aquifer has concentrations close to pure fresh water. To its edges, it may reach 15 parts per thousand (about half that of seawater). That's still valuable. Desalination plants could easily turn that into drinking water


Source link