How Do Ocean Currents Affect Global Climate

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How Do Ocean Currents Affect Global Climate – It is considered a major shift in scientific understanding of the global ocean circulation system and how it responds to global warming. An apocalyptic scenario involving the collapse of vehicles – shown before a jury of research and a weather disaster film

— I was very close last month. Instead of standing on the North Atlantic side, as previously thought, the situation is quite different at the other end of the world.

How Do Ocean Currents Affect Global Climate

How Do Ocean Currents Affect Global Climate

A new analysis by Australian and American researchers, using new and detailed ocean models, predicts that the long-awaited circulation in the Pacific Ocean will break in the billions of tons of ice would melt on Earth. of Antarctica. In addition to being more than a century away, similar to the North Atlantic models, it may occur within the next three years.

Climate Change: Global Temperature

Leading marine and atmospheric scientists not involved in the research, who were invited to speak, welcomed the findings. “This is a very important step,” said Stefan Rahmstorf, oceanographer and head of earth system analysis at the Potsdam Institute for Climate Impact Research in Germany. “I think tradition and pattern are important.”

Both studies provide new evidence of the impact of global warming on ocean circulation.

“This is the most original research I’ve seen for some time,” said British polar researcher Andrew Shepherd of Northumbria University in Newcastle. “I was very surprised by this work, but they accepted me. It was a project. All the ideas were on the North Sea. But I hope that the focus will change to the Sea to the South.”

Meanwhile, the long-standing concern is that the North Atlantic Ocean flow will end sometime in the 21

Explainer: How Does Climate Change Affect The Ocean?

The century seems to be winding down. A Swiss study published this month found that, contrary to previous beliefs, the circulation did not fall at the end of the last ice age, the researchers say, better than thought of front and less fall.

Both studies provide new evidence of the impact of global warming on ocean circulation, which is one of the stabilizing forces of the global climate system.

The ocean circulation system, called the global circulation, follows a periodic path through the Earth’s oceans, shaking their waters from top to bottom. It begins as water flows from the surface and disappears into the depths, from where the world is trampled, not to emerge for centuries. By trapping heat and carbon dioxide from the atmosphere and burying both in the deep ocean, we are reducing global warming.

How Do Ocean Currents Affect Global Climate

The carrier is driven from the cold, salty water that descends to the ocean floor in only two places: in the North Atlantic, near Greenland, and in the Southern Ocean around Antarctica. In both cases, the meaning is the same. In cold polar conditions, a lot of water freezes. Salt in water does not form ice. As it remains in the remaining liquid water, it becomes more and more salty. The saltier the water, the stronger it is. So the balance is heavier than the surrounding water and sinks to the bottom of the ocean.

Global Ocean Surface Currents

About 250 trillion tons of salt water sinks like Antarctica every year, spreading northward across the ocean floor to the Indian, Atlantic, and Pacific oceans. Similar books spread south from Greenland. The process is known as deep-water formation, or ocean circulation, and has remained unchanged for thousands of years.

But how long? As the world warms, there is less ice in the oceans at the ends of the Earth each year. At the same time, more ice from the great Antarctic and Greenland ice sheets is melting, releasing fresh water into the ocean.

As a result, surface waters in the Pacific Ocean and around Greenland have become less saline and therefore less likely to sink. Since the 1990s, measurements from ships have shown that the ocean floor below 13,000 feet has warmed and cooled, and the ocean has become more active. to the South.

For years, climate scientists have warned that the warming of the North Sea could disrupt the global circulation system. Such a shutdown would have significant consequences, including neutralizing Europe’s influence on the warming of the Pacific Ocean, part of global warming, and allowing the western countries in deep freeze while the rest of the world is warming. . Most studies suggest that this extreme trend is a result of global warming, but probably not this century.

How Do Ocean Currents Affect The Biosphere?

However, very little research has been done on the nature of Antarctic waters. Some oceanographers, such as Alessandro Silvano of the University of Southampton in England, have predicted that the melting of the ice and the cooling of the ocean waters will reduce the structure of the Antarctic plate. The latest assessment by the UN’s Intergovernmental Panel on Climate Change (IPCC) says that by the end of this century “reasonable confidence” has occurred. But he said the models can’t calculate the effect of ice melt on how fast or how far that phenomenon will occur. According to Rahmstorf, this failure, which arose because ice dynamics were not fully understood and were not incorporated into models of climate change and ocean currents, was “a major error , long ago” of the patterns presented in the IPCC’s major reports.

A landslide modeling study published by Australian and American researchers at the end of March includes for the first time a detailed assessment of the potential impact of melting glaciers, highlighting the importance of this previous inconsistency. Deep-water production in the Pacific Ocean is projected to decline by 42% by 2050. This is more than double the 19% predicted for a similar event in the North Atlantic.

And after 2050, their model predicts it will get even worse. Deep-sea formation “looks set to decline this century,” said study lead author Matthew England of the University of New South Wales.

How Do Ocean Currents Affect Global Climate

. “And it will fall and continue to disappear until Antarctica stops melting. According to current predictions, that could take hundreds of years.

Ocean Currents: Forces Responsible For Ocean Currents

“The physics of the game are very simple,” says England. “None of the movements are particularly difficult or surprising. But until we study them, we don’t have the circulation model … to make reliable predictions.” The slowdown itself, he says, “didn’t surprise me. But the speed of the change – to see a 40% decline in less than three decades – was amazing.”

“This is the first time I’ve seen a strong argument about the impact of melting Antarctic ice on the Pacific Ocean,” Shepherd said. “They convinced me that the current rate of melting is high enough to affect ocean circulation.”

Antarctica is the largest ice reserve in the world. Therefore, according to Shepherd, “we should expect the impact of this collapse to be felt.” The authors of the paper agree. Slowing ocean currents “will dramatically alter the circulation of ocean heat, freshwater, oxygen, carbon and nutrients, with impacts across the global oceans for centuries,” the concludes lead author Qian Li, an oceanographer at the Massachusetts Institute of Technology. of Engineering.

Ecologists are deeply concerned about the shutdown of ocean nutrient cycling. During this time, nutrients fall to the ocean depths as dead marine animals sink to the ocean floor, but are brought back to the surface by transporters.

Important Facts Related To The Ocean Currents

However, if there is no new deep water sinking to the ocean floor, there is nothing to bring nutrients back to the surface. Instead, the deep ocean waters collect nutrients and inertness, as the supply of nutrients to support marine life is greatly reduced, according to one of the authors of the paper, Adele Morrison of University of Australia. Marine ecosystems may collapse. This will not happen soon. It may take a while, but once I get on the train I can’t stop.

A shutdown would accelerate global warming, Rahmstorf said. “Deep basins are channels that transport carbon dioxide to the ocean floor, where it is effectively locked away from the atmosphere for centuries [and] is currently helping to slow global warming. . However, this process will weaken.” The IPCC estimates that the oceans absorb a quarter of all CO2 emissions, mostly through deep-water formation.

The cessation of deep-water production in the Pacific Ocean will change the global climate in other ways that are difficult to predict. It can change tropical rain systems, according to England, making the Southern Hemisphere completely dry and the Northern Hemisphere wet.

How Do Ocean Currents Affect Global Climate

Gene. But for now, for some scientists, there is less concern about the dangers of the first form of disease in the North Pacific. A Swiss study published in early April analyzed the climate record of marine sediments to assess their vulnerability

Climate Change And The Ocean: Oxygen Poor Zones Shrank Under Past Warm Periods, Scientists Discover

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