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#amoc

5 posts5 participants0 posts today

@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

youtu.be/451xJqNGFqU?si=40OsK3

New summary by @rahmstorf

Is the Atlantic Overturning Circulation Approaching a #TippingPoint?

"But the fact that all these studies, using different methods, point in the same direction, toward a risk that is much larger and earlier than we had thought until a few years ago, is a major concern. My assessment of these ... studies is that by the time they can provide a reasonably reliable warning of an impending #AMOC tipping, it will be too late to prevent it."
#climate
tos.org/oceanography/article/i

❄️Between the last glacial maximum & today, humans were exposed to severely rising sea levels 🌊 & recurrent phases of strong abrupt cooling events.🥶 #MPIM researchers have uncovered the origin of these strong temperature fluctuations over the past 20,000 years using a novel coupled climate-ice sheet model. They found that #iceberg armadas 🧊🧊🧊 & changed river courses were responsible for #AMOC weakening & abrupt cooling.
mpimet.mpg.de/en/communication
CC BY 3.0 Ziemen et al. 2025 doi.org/10.5446/69659

Schwächere Meeresströmung = Billionenkosten? ⚠️Eine #AMOC-Abschwächung senkt die #CO₂-Aufnahme des Ozeans, verstärkt die #Erderwärmung & treibt Kosten in die Höhe - das fanden die Forscher @felixschaumann & @Edu_Alastrue in ihrer neuen Studie heraus. In diesem short Wissen-Was-Video fasst Carolin Riethmüller das Wichtigste für Euch zusammen (2:45 min) ▶️ (@MPI_Meteo 🔗 youtu.be/BoNA-C7fFoI?feature=s

#FYI #PaulBeckwith video lecture and literature review #AMOC #AmocShutdown

"- wind driven flow of water in the Southern Hemisphere would keep the AMOC flow slightly above zero
- havoc would still be wreaked on the Earth
- this new paper is not in disagreement with previous work, but adds to our understanding of the AMOC"

youtube.com/watch?v=T8rj117OvAI

#talkcollapse:

"A total #AMOC collapse is unlikely this century. But even weakened currents would cause profound harm to humanity. 'In the short term, it doesn’t really matter if we have a strong weakening, say 80%, or a collapse.'"

But at least the headline is unrealistically encouraging :)
theguardian.com/environment/20

The Guardian · Total collapse of vital Atlantic currents unlikely this century, study findsBy Damian Carrington
Replied in thread

@metoffice @nature it doesn't 'reveal' that. It may suggest it, but short of a time machine or a very perfect model, you can't 'reveal' things that haven't happened yet.

Obviously, every successive year in which #AMOC hasn't yet collapsed is good news for north western Europe. I'm not knocking that. But the future is as yet unknowable.

A major motor for the global #climate is beginning to falter: a massive system of #ocean currents called the Atlantic Meridional Overturning Circulation (#AMOC).

A weaker AMOC could produce long-term costs amounting to several trillion euros by the year 2100.

Weakening AMOC would further accelerate climate change because less CO₂ is transported from the surface ocean to the deep ocean. More CO₂ remains in the #atmosphere, which accelerates global warming.

phys.org/news/2025-02-term-glo

Phys.org · Long-term costs of global warming: Weaker ocean circulation could cost trillionsBy University of Hamburg