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#amoc

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'Southern Ocean current reverses for first time, signalling risk of climate system collapse'

Edit:
I removed the info and the link to the article. I regret posting it.

There is no information elsewhere that confirms what Intellinews says, it seems they misunderstood a study about salinity and sea ice that was published a week earlier in PNAS.

I now think it's a misleading and sensationalist article.

My apologies to anyone who (like me) felt alarmed by this article.

More info about what's wrong with the article can be found here:
reddit.com/r/EverythingScience

Replied in thread

@Ruth_Mottram
@petergleick
@PIK_climate
@MichaelEMann

#ClimateCatastrophe #SMOC #AMOC

OMG! --Have you heard about this? --*Allegedly*, #SMOC has not only slowed, but gone in reverse!

mathstodon.xyz/@johncarlosbaez

Has this been corroborated?

@SnowshadowII

MathstodonJohn Carlos Baez (@johncarlosbaez@mathstodon.xyz)The Trump gang just took down a bunch of legally mandated climate assessments. Meanwhile, here in actual reality, the climate doesn't give a fuck: “We are witnessing a true reversal of ocean circulation in the Southern Hemisphere—something we’ve never seen before. While the world is debating the potential collapse of the AMOC [Atlantic Meridional Overturning Circulation] in the North Atlantic, we’re seeing that the SMOC is not just weakening, but has reversed. This could have unprecedented global climate impacts.” That's a quote from Antonio Turiel, one author of a new paper in the Proceedings of the National Academy of Sciences. This study found that since 2016, the water in parts of the Antarctic Ocean is getting more salty. This suggests that the deep ocean circulation in the southern hemisphere—known as the SMOC—has reversed. Instead of sinking into the depths, surface water is now being replaced by deep water coming up to the surface. This reversal seems to be driving the accelerated melting of sea ice in the Antarctic Ocean: https://www.icm.csic.es/en/news/major-reversal-ocean-circulation-detected-southern-ocean-key-climate-implications This web page from the Institut de Ciències del Mar says "In the long term, this process could double current atmospheric CO₂ concentrations by releasing carbon that has been stored in the deep ocean for centuries—potentially with catastrophic consequences for the global climate." But never mind, just close your eyes. Don't read this: • Alessandro Silvano et al, Rising surface salinity and declining sea ice: A new Southern Ocean state revealed by satellites, https://www.pnas.org/doi/10.1073/pnas.2500440122
Replied in thread

@Ruth_Mottram @SnowshadowII

👉#AMOC: disruptions to theAtlantic Ocean’s circulation system 👈
#ClimateCrisis

(3/3)

..."In January 2025, over 40 scientific experts and research funders convened in Brussels and online for a high-level scoping meeting to outline the goals and structure of the assessment."

(02/25)

jpi-oceans.eu/en/shedding-ligh

PS:
Any research coming from the #US should be viewed with a political - bias correction, in particular in #MAGA anti-science areas such as #ClimateChange.
//

jpi-oceans.euShedding light on AMOC: JPI Climate and JPI Oceans launch Assessment Initiative
Replied in thread

@Ruth_Mottram @SnowshadowII

👉#AMOC: disruptions to theAtlantic Ocean’s circulation system 👈
#ClimateCrisis

(2/n)

...#JPI Climate/JPI Oceans/AWI/#Helmholz:

"Weakening, tipping or going strong? Experts convene in Brussels to start a review on the Atlantic Meridional Overturning Circulation (AMOC)"

"The final report, expected within the next one and a half years, aims to provide decision-makers with robust evidence to inform climate policies at national and international levels."

...

"A glimmer of hope."
Several research programs are trying to find out whether the #AMOC is heading for a tipping point.
Chief scientist Kjetil Våge on the norwegian icebreaker Kronprins Haakon: "We need to do what we can to try to prevent that.”
Good feature in Nature:
nature.com/articles/d41586-025

www.nature.comIs a monster web of ocean currents headed for collapse? The race is on to find outResearch ships rarely brave the Greenland Sea in winter. Early this year, scientists ventured into the ice-covered waters to capture crucial data about the planet’s future.
Continued thread

When lead author Van Westen talks about "a more unstable [AMOC] regime which corresponds to actual observations", he means studies like this. These measurements indicate a bistable #AMOC regime unlike in many models, i.e. closer to the tipping point.
So that their model requires quite a lot of freshwater input to get close to the tipping point is to counter this well-known bias found in many models.
In any case, this study is not about how close the tipping point is, but about what happens once the AMOC breaks down in a global warming world. It is about the temperature response to counter-acting forces: global warming and regional cooling.
agupubs.onlinelibrary.wiley.co

@rahmstorf

In 1989 James Burke produced a documentary named "After the Warming" which highlighted the effect of slowing the global thermohaline circulation current.

"That was the key to everything. Change the saltiness of the Atlantic and you change the world's weather."
#AMOC #GlobalWarming #ClimateChange

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