well, there always will be some circulation, because the equator is hotter than the poles, and because the earth spins. but there has indeed been some concern that climate change may weaken the northeastward currents in the north atlantic, the result of which would be europe getting colder.
The overturning circulation will always be there, as @Ian-nl9yd explains. Climate models show a weakening of this circulation in the North Atlantic with global warming (agupubs.onlinelibrary.wiley.com/doi/10.1029/2023GL103515). Due to the increased greenhouse effect, the same models still have increasing temperatures over land.
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What would happen if there was no circulation?
well, there always will be some circulation, because the equator is hotter than the poles, and because the earth spins. but there has indeed been some concern that climate change may weaken the northeastward currents in the north atlantic, the result of which would be europe getting colder.
The overturning circulation will always be there, as @Ian-nl9yd explains. Climate models show a weakening of this circulation in the North Atlantic with global warming (agupubs.onlinelibrary.wiley.com/doi/10.1029/2023GL103515). Due to the increased greenhouse effect, the same models still have increasing temperatures over land.