Ivi Choc<p><a href="https://mastodon.online/tags/FYI" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FYI</span></a> <a href="https://mastodon.online/tags/OceanCirculation" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OceanCirculation</span></a> <a href="https://mastodon.online/tags/Antarctic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Antarctic</span></a> <a href="https://mastodon.online/tags/SMOC" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>SMOC</span></a> <a href="https://mastodon.online/tags/reverse" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>reverse</span></a></p><p>Original open access article</p><p>Silvano et al. June 30, 2025 Proc. Natl. Acad. Sci. U.S.A. 122 (27) e2500440122</p><p>Rising surface salinity and declining sea ice: A new Southern Ocean state revealed by satellites <br><a href="https://doi.org/10.1073/pnas.2500440122" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">doi.org/10.1073/pnas.2500440122</span><span class="invisible"></span></a></p>
#smoc
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Seen a #TippingPoints story recently about the SMOC (the ocean's overturning circulation around Antarctica, i.e. AMOC's southern sibling) abruptly reversing?
Thankfully, it's not true (seems a press release got overenthusiastic).
Want to know what the paper behind it really said? Read this from the lead author instead: https://theconversation.com/completely-unexpected-antarctic-sea-ice-may-be-in-terminal-decline-due-to-rising-southern-ocean-salinity-259743
The Conversation‘Completely unexpected’: Antarctic sea ice may be in terminal decline due to rising Southern Ocean salinity
More from 
The Conversation UK
There are some #ClimateChange related headlines appearing that are, imo, scaremongering and unhelpful. The Southern Meridional Overturning Circulation (#SMOC) has not reversed, the only reversal mentioned in the original paper is in the Southern Ocean Sea Surface Salinity trends.
So it was great to hear @wavygk on RNZ:
https://www.rnz.co.nz/news/world/566281/southern-ocean-getting-warmer-and-saltier-will-change-the-way-the-planet-works
where he gave an expert analysis of the #PNAS paper:
https://www.pnas.org/doi/10.1073/pnas.2500440122
"So …it'll change the way the planet works", but not the #SMOC… yet!
RNZ · Southern Ocean getting warmer and saltier, will 'change the way the planet works'
Just a heads up because I've been seeing it shared around here, but a news article is claiming the SMOC (Southern Meridional Overturning Circulation) has reversed when the original paper says no such thing.
A reminder that science journalism is a difficult field of work with a lot of complex concepts and data often not successfully translating to a news article, and preconceived notions can often muddy the waters and spread misinformation or even disinformation.
I'm Team Captain Planet, but addressing climate change needs sound science and trustworthy publishing and reporting for us to have a chance at winning the fight for a sustainable world.
Doomerism breeds where falsehoods lurk. If you find research publications to be impenetrable, it's good to wait a week after extraordinary announcements to see if any scientists step up to call bullshit. If you are unfamiliar with academia, trust me when I say that scientists love calling bullshit on extraordinary claims.
https://iowaclimate.org/2025/07/06/ocean-reversal-hysteria-facts-not-included/
Iowa Climate Science Education · Ocean “Reversal” Hysteria: Facts Not IncludedGuest Post by Willis Eschenbach Every so often, the climate media machine spits out a headline so breathless you’d think the laws of physics had just been accidentally repealed by a badly-worded ex…
Replied in thread
@rahmstorf I scare what I read about #SMOC
Continued thread
#FYI #OceanCirculation #Antarctic #SMOC #reverse
Research Institute Article:
Major reversal in ocean circulation detected in the Southern Ocean, with key climate implications
www.icm.csic.esA change in the Southern Ocean structure can have climate implications | Institut de Ciències del Mar
Continued thread
#FYI #OceanCirculation #Antarctic #SMOC #reverse
Original open access article
Silvano et al. June 30, 2025 Proc. Natl. Acad. Sci. U.S.A. 122 (27) e2500440122
Rising surface salinity and declining sea ice: A new Southern Ocean state revealed by satellites
https://doi.org/10.1073/pnas.2500440122
#FYI #PaulBeckwith video lecture and literature review #Antrarctic #AntarcticOcean #SMOC
Was waiting for Paul's reaction on the reversed Southern Meridional Overturning Circulation, here it is:
Es passiert! 
Die Umwälzströmung im Südpolarmeer hat sich umgekehrt. Nix mehr mit “in 300 Jahren”. Ist passiert.
Konsequenz:
"Major reversal in ocean circulation detected in the Southern Ocean …
… 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 …
'We are witnessing a true reversal of ocean circulation in the Southern Hemisphere—something we’ve never seen before'"
Link to the study, published on June 30, 2025 in PNAS:
www.icm.csic.esMajor reversal in ocean circulation detected in the Southern Ocean, with key climate implications | Institut de Ciències del Mar
Major reversal in #OceanCirculation detected in the Southern #Ocean, with key climate implications.
The study’s main finding is surprising and alarming: since 2016, a sustained increase in surface salinity has been detected in the region between the polar and subpolar gyres of the Antarctic Ocean. This change in water composition suggests that the deep ocean circulation in the Southern Hemisphere (known as the #SMOC) is not only being altered, but has reversed.
www.icm.csic.esMajor reversal in ocean circulation detected in the Southern Ocean, with key climate implications | Institut de Ciències del Mar
Mientras nos entretienen y nos dejamos entretener..., el planeta no deja de lanzar señales de advertencia. Vamos por muy mal camino y nada indica que se vaya a cambiar el rumbo con la urgencia necesaria. ¿Seguiremos esperando a ver si surgen los cambios por arte de magia o seremos parte del cambio?
El Periódico · Detectan cambios profundos y demoledores en el Océano Antártico