September 23, 2021

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A great Atlantic Ocean current threatens to become desolate, it worries

It is called “Midline rotation Atlantic Reversal “(Amoc). This ocean current, which plays a role in the thermostat in global climate, is breaking down, a new study published in the August 5 issue of the journal. Natural Climate Change *. From a researcher According to the Botstam Institute for Climate Impact Research in Germany, the first signs of systemic disruption are being observed, causing rain and brightness on the planet.

“I did not expect the symptoms of instability to be already visible. It’s scary.”Respondent Nicholas Boers, author of the study, was quoted as saying Defender *, To whom can this predict the decline of Amok. “We can’t allow this”, He warns. Because if scientists say that these disturbances are the cause of global warming caused by human activities, the collapse of this system will further accelerate the increase in temperature and push our planet into a terrible and unpredictable vicious circle.

What is amok and what is it used for?

In the meridian cycle The Atlantic reverse describes the complex operation of the water cycle In the Atlantic Ocean. Depending on its salinity, mass, density or temperature, water actually moves differently in this vast system, creating a flow that is constant and constant up to it. By carrying large amounts of water from the surface to the depths – and vice versa – Amok helps to control the climate as we know it.

But since the 1960s, this flow has weakened considerably, Reached its lowest level in a thousand years, scientific research has found Published in review Natural Earth Science* (PDF) Last March.

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By studying Amok’s behavior over the past 100,000 years, scientists have discovered that there are two modes of operation. Defender One, fast and powerful, has been seen over the last thousands of years, and the other, slow and weak. However, a recent study confirms that temperature rise triggers a rapid transition from one state to another. “Loss of dynamic stability indicates that AMOC has reached a critical point, beyond which an irreversible change to its weak operating system may occur.”, Detailed Nicholas Boers for Company Reuters*. At this point, however, the level of knowledge does not allow us to know whether this change will come soon or in several centuries.

What will be the consequences of its collapse?

Climate experts on Amok’s declineDefining point “(“Point” In English), i.e. the time when the weather can suddenly and completely change to a completely different state than what we know today.

The effects of this change will be enormous on the climate. Temperatures in the Northern Hemisphere will become much colder, the number of storms will increase, while the size of the Atlantic Ocean will see a sharp rise. The monsoon will change in Africa and South America, exposing more people to severe drought. In March, Franின்ois Hollande asked about the recession in Amok. Didier Swingtow, CNRS researcher And Expert in Climate Change, mentioned “Disruption of marine ecosystems and decline in all seafood production”.

He finally pointed out “Decrease in CO2 absorption, hence increase in concentration of this gas in the atmosphere, followed by increase in temperature on Earth and increase in temperature of oceans”. Or the acceleration of climate change.

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What is the origin of this instability?

The ocean has warmed significantly over the past 50 years due to anthropological greenhouse gas emissions as it absorbs and stores heat more efficiently than land and the atmosphere. Media France. Or, Sela aEffects on the properties and dynamics of the ocean, its exchangeseAtmospheric and marine ecosystem habitats “, The company states.

In addition to this rise in sea temperature, fresh water from frozen ice – lighter than salt water – is again caused by climate change, disrupting the circulation of ocean currents. “I did not expect that the excess fresh water added in the last century would cause such a turn in already in circulation., Nicholas Boers reacted Defender. In light of these observations we should immediately reconsider our models in order to estimate how far Amoeg is at the edge of crossing this limit. ”

Meanwhile, scientists recommend combating the phenomenon at the source by reducing greenhouse gas emissions. And it’s tough.

* Links following the star are in English.