Sediments off Brazil's northeast coast reveal sudden changes in heat transport in the Atlantic
According to a new study led by researchers from Brazil and Germany, the main system that transports heat from one end of the Atlantic Ocean to the other may undergo sudden changes in intensity driven by climate change similar to what we are experiencing now, even when it is already weakened.
A new study reveals that the Atlantic Meridional Overturning Circulation (AMOC), a key system transporting heat across the Atlantic Ocean, may undergo sudden changes in intensity due to climate change. Led by Brazilian and German researchers, the study found evidence of two episodes of significant AMOC intensification between 17,800 and 14,800 years ago, during a period known as Heinrich Stadial 1, when the circulation was weaker than today.
The analysis of marine sediments from an equatorial Atlantic site off Brazil's coast showed two abrupt surges in AMOC strength during this time, one lasting 200 years around 15,400 years ago and exceeding its current intensity. This finding challenges previous assumptions that the AMOC remains in a weakened, stable state for thousands of years.
As global warming weakens the AMOC by melting Greenland glaciers, warming the Arctic Ocean, and increasing rainfall in the region, the study highlights the need for society to prepare for abrupt climate changes and subsequent AMOC intensifications.
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