Aug 10, 2021 17:30:00

A study that the stability of the Atlantic meridional thermohaline circulation, one of the ocean circulation systems, was almost completely lost.

Has given the impact on the climate of the Earth 'ocean general circulation' is

likely to weaken the influence of global warming , but has been pointed out previously, this one, the Atlantic Ocean north-south thermohaline circulation is an ocean current system of the Atlantic Ocean, the number here It has been the weakest in a decade, and it has become clear that stability has been almost completely lost in the last century.

Observation-based early-warning signals for a collapse of the Atlantic Meridional Overturning Circulation | Nature Climate Change
https://doi.org/10.1038/s41558-021-01097-4

Climate crisis: Scientists spot warning signs of Gulf Stream collapse | Climate change | The Guardian

https://www.theguardian.com/environment/2021/aug/05/climate-crisis-scientists-spot-warning-signs-of-gulf-stream-collapse

The research was conducted by Niclas Bohr of the Faculty of Mathematics and Information Science, Free University of Berlin.

Due to the difference in density due to water temperature and salt content, seawater has a deep circulation called the 'thermohaline circulation'. What exists in the Atlantic Ocean is the 'Atlantic north-south thermohaline circulation,' in which the warm northward surface current is cooled off the coast of Greenland, becomes heavier, and sinks into the bottom layer to the south.

A 2017 study pointed out that the Atlantic meridional overturn is weakening. Studies show that the Atlantic meridional overturn began in the 19th century and accelerated from the middle of the 20th century. The last few decades have been the 'weakest state'.

The 'ocean general circulation', which circulates seawater on a global scale, may be weakened by the effects of global warming --GIGAZINE

by

quapan

According to a new study, the Atlantic meridional overturn is almost completely unstable and may be 'near the end.'

The thermohaline circulation itself is a very complicated system, and it is not clear how global warming will change in the future, so it is not known exactly when the 'day of collapse' will be. If the 'day of collapse' comes, it is expected that storms will increase and temperatures will drop in Europe, sea levels will rise on the east coast of North America, and precipitation will decrease in India, South America and West Africa, and the Amazon rainforests and Antarctic ice sheets. Scientists say, 'Never allow the day to come,' as it poses an additional risk to the ice sheet.

In 2019, some have pointed out that the global environment is already approaching an irreversible “turning point”, but the climate crisis has continued to worsen since then.

The global environment may have come to the point where it can't be returned anymore --GIGAZINE

'This analysis provides evidence that the thermohaline circulation is already unstable,' said Levke Carsar of Maynooth University, Ireland, who was not directly involved in the study. I think it's a warning that the turning point may be near. '

'I'm worried about the signs of instability, but I'm still not sure if the collapse will occur or how close it is,' said David Sonary of University College London.