this post was submitted on 06 Jul 2025
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"We are witnessing a true reversal of ocean circulation in the Southern Hemisphere—something we’ve never seen before,” explains Antonio Turiel, ICM-CSIC researcher and co-author of the study. “While the world is debating the potential collapse of the AMOC in the North Atlantic, we’re seeing that the SMOC is not just weakening, but has reversed. This could have unprecedented global climate impacts.”

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[–] fluxion@lemmy.world 54 points 2 days ago (17 children)

Can we get lucky just this once and this new ocean circulation cancels out global warming?

[–] wjrii@lemmy.world 49 points 2 days ago (10 children)

Nope.

That is, instead of sinking into the depths, surface water is being replaced by deep water masses rising to the surface, bringing with them heat and carbon dioxide (CO₂) that had been trapped for centuries.

I had to look up that last part, as it seemed counter-intuitive, but apparently deep ocean water bottoms out at 4 degrees C.

[–] Bob_Robertson_IX@discuss.tchncs.de 5 points 1 day ago (2 children)

I had to look up that last part, as it seemed counter-intuitive, but apparently deep ocean water bottoms out at 4 degrees C.

Right, but I still wouldn't call water that is 4 degrees C as warm. How is deep water warm?

[–] wjrii@lemmy.world 4 points 1 day ago (1 children)

I'm not going to claim to fully understand the nuances, but the sea ice will melt at about -2C and glacial melt will deposit ~1C water into the system. If the deep water is steady at 3C or 4C, sending it up could accelerate melting of both.

Thank you... I'm an idiot and wasn't thinking about the Southern Ocean as in 'The' Southern Ocean... instead I was thinking about it in terms of the oceans in the south (as in, not necessarily glacial). But yes, now I get it and understand. It probably would have helped if I had opened the link to start with.

[–] WanderingThoughts@europe.pub 9 points 1 day ago (1 children)

That was my physics teacher.

"So materials shrink as they get colder."

"Ma'am, doesn't ice expand?"

"We don't talk about that."

[–] dubyakay@lemmy.ca 3 points 1 day ago (1 children)

Ice doesn't expand. Ice as a solid shrinks when getting colder. H2O expands during phase transformation from liquid to solid.

[–] Natanael@infosec.pub 2 points 1 day ago

The density of ice Ih increases when cooled, down to about −211 °C (62 K; −348 °F); below that temperature, the ice expands again (negative thermal expansion).

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