Friday , October 22 2021

The main study overwrites the source of the Atlantic circulation



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Atlantic meridional oscillation current

The circulation of the Atlantic turning movement shown here serves as a conveyor belt that transports heat and pulls carbon from the atmosphere in the deep ocean. (Credit: R. Curry, Woods Hole Oceanographic Authority / Science / USGCR)

A huge amount of water circulates throughout the Atlantic and is the main driver of the Earth's climate. Now researchers have found that there is no suspicion in the center of this movement.

“General understanding has been [that it’s] The Labrador Sea, located between the Canadian coast and the western part of Greenland, ”said Susan Lozier, a physical oceanographer at Duke University in Durham, North Carolina, who led the new study. “Instead, we found that… the biggest [of it] from the east of Greenland to the shelf of Scotland. ”

Opening up will help improve global climate patterns.

Ocean In Motion

Waterways through the Atlantic Ocean in two layers. The shallow layer pulls warm water from the north. This layer, which includes Gulf Stream, helps keep winter in Western Europe relatively mild. As warm waters travel to the North Atlantic, they cool down and then pour out to form a second layer spreading south.

This current conveyor belt, known as the Atlantic Coast Revolution, or AMOC, affects the climate by transporting heat and moving carbon from the atmosphere to the deep ocean. Although its flow is changing, the Intergovernmental Panel on Climate Change predicts that the AMOC will slow down in the 21st century. And when the climate heats up, the waters that are wide in width could not sink or fall over, slowing down the AMOC.

"We are trying to understand in the coming years and decades how sensitive these reversals are, which we expect to be wide," said Lozier.

O (h) SNAP!

That's why in 2007, Lozier started the conversion of the North Atlantic program subpolar or OSNAP, which is called a phrase commonly used by the then 19-year-old son. The $ 32 million five-year program benefits from the experience of scientists from seven countries, which Lozier calls "amazing international cooperation".

In August 2014, researchers deployed an OSNAP observation system – a range of tools extending from the Labrador Sea to the Canadian coast to the Scottish shelves to assess the temperature, flow and salinity of water moving to and from the North Atlantic. After more than 21 months of measurement, researchers in April 2016 restored the first round of array.

The OSNAP array revealed circulation circulation between the southwestern end of Greenland and the Scottish shelf, which is about seven times larger than the Labrador Sea, and the team today reports in the magazine Science. Occasional rollover in the area east of Greenland also accounts for 88% of AMOC differences discovered by researchers.

"We want these data to provide models because the models are the only ones that can provide forecasts," said Loziers. “They now have this criterion. And if they can see what we see with these OSNAP observations, they will be able to provide us with better forecasts for the coming years and decades. ”

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