Antarctica shock: Scientists’ groundbreaking discovery 400ft below ice…


Antarctica is the planet’s southernmost continent where the geographic South Pole is located and is home to some 1,000 scientists attempting to understand more about the history of Earth and the effects of climate change. However, one programme, known as the Antarctica Drilling Project (ANDRILL), took things one step further by drilling more than 400 feet into the ice sheet, exposing a shocking past. Their experiment was shown during NOVA’s “The Secrets of Antarctica” documentary, in which they hoped to uncover more about past periods of global warming and cooling.

The narrator revealed in 2015: “Unlike drilling through sea ice which is just 26 feet thick the ice shelf here is 400 feet at least.

“But that’s only the beginning, no one has ever drilled through an ice shelf and it presents a challenge because they float up and down with the tide so you’ve got to deal with vertical and sideways change.

“Eventually the drill pipe will get bent, to you need to drill through a thick layer of ice that is constantly moving without breaking.

“To confront this unique challenge, the ANDRILL team invents a new tool, a hot-water drill, this marvel of engineering is a moving ring of heat that blasts jets of steaming water to melt a wide hole so the drill can operate freely through 400 feet of shifting ice.

“Once again, time is so precious that the team must work around the clock, not only retrieving cores but also analysing them.”

The narrator went on to reveal the groundbreaking discovery made thanks to the revolutionary drill.

He added: “An 80 feet core dates back about three million years and is closely examined.

“It contains microfossils of single-celled animals known as forams.

“They are from the crucial warm period called the Pliocene and these tiny shells are precise indicators of ocean temperature.”

READ MORE: How Antarctica doubled in size following ‘major transformation’

Dr Gavin Dunbar, from the Antarctic Research Centre, explained how the sample of forams may reveal a shock to Earth’s path.

He said in 2015: “These guys are about the size of a grain of sand and because the same species lived through time we can use the chemistry and molecule examples to calibrate the ancient examples.

“We can measure two metals, magnesium and calcium that are in the ocean that get incorporated into their shells.

“That process depends on the temperature of the ocean, so if we know those levels, we can determine the temperature of the ocean at the time that foram lived.

“What this is telling us is that temperatures were three to four, maybe even five degrees above present.”


Source link Google News