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Scientists warn that if the AMOC system, which affects global weather, collapses, it will have catastrophic consequences.
The current system of the Atlantic Ocean, which is the climate engine of the northern hemisphere, may be weakened by climate change, which may have serious consequences for the world’s weather, including “Extremely cold“According to a new scientific research, sea levels are rising in parts of Europe and North America and parts of the United States.
The Atlantic Meridional Overturning Circulation (AMOC) is part of a large ocean current system called the Gulf Stream, which transports warm water from the tropics northward to the North Atlantic Ocean.
Niklas Boers of the Potsdam Institute for Climate Impact Research said: “The loss of dynamic stability means that AMOC is close to its critical threshold, beyond which a substantial and practically irreversible transition to weak mode may occur.” learn Released on Thursday.
As greenhouse gas emissions increase and the atmosphere warms, the surface ocean below retains more heat. According to the research, the potential collapse of the system may have serious consequences for the world weather system.
The Met Office or the Bureau of Meteorology warned that if the AMOC collapses, it will intensify cooling in the northern hemisphere, leading to rising sea levels in the Atlantic Ocean, overall decline in precipitation in Europe and North America, and changes in the monsoons in South America and Africa. .
In April of this year, the United Nations warned that the world was Climate crisis “the abyss”Just as Secretary-General Antonio Guterres urged countries to “end our war on nature.”
In recent weeks and months, parts of the world have been affected by extreme weather conditions. People blame climate change on climate change—from Deadly wildfires in Turkey and Greece Floods occurred in many parts of Asia, including China, killing more than 300 people.
Climate models have shown that AMOC is in its weakest state in more than 1,000 years.
However, it is not clear whether the weakening is due to changes in circulation or loss of stability.
The study, published in the journal Nature Climate Change, said this difference is critical.
By analyzing the sea surface temperature and salinity patterns of the Atlantic Ocean, the study shows that the weakening in the last century is more likely to be related to the loss of stability. Scientists say that the world should do everything it can to keep emissions as low as possible.
“The research results support the assessment that a drop in AMOC is not only a fluctuating or linear response to temperature rise, but it may mean approaching a critical threshold, beyond which the circulatory system may collapse,” Boers said.
In 2018, during the winter storm Grayson in Cow Bay, Nova Scotia, Canada, a man stood in front of the waves when the Atlantic storm surge hit the breakwater [File: Darren Calabrese/Reuters]Other climate models say that AMOC will weaken in the next century, but it is unlikely to collapse before 2100.
Another study published in the September 2021 edition of “Weather and Climate Extreme Events” found that the increase in extreme precipitation after 1996 was caused by greenhouse gases produced by human activities and warming of the Atlantic Ocean, which would produce stronger , More frequent hurricanes.
“Our previous work has shown that extreme precipitation in the Northeast has increased dramatically in the past 25 years, but this study is the first to prove that this increase is partly due to man-made climate change,” lead author Huang Huanping, a postdoctoral fellow at the institute. The Dartmouth College article published on the Phys.org website quoted Lawrence Berkeley National Laboratory’s Department of Climate and Ecosystem Sciences as saying.
“Our research results show that decades of changes in Atlantic sea surface temperature are an important driver of Atlantic warming. Together with man-made greenhouse gases and aerosols, they have also led to an increase in extreme precipitation in the Northeast after 1996,” Huang said.
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