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Atlantic current system could be weakening faster than expected

Phys · · 522 words · By Paul Arnold

The article reports on a study published in Science Advances suggesting that the Atlantic Meridional Overturning Circulation (AMOC) may weaken by 51% by 2100. This projection is higher than previous model estimates and was reached using a combination of real-world data and CMIP6 climate models.

open_in_new Read the original article: https://phys.org/news/2026-04-atlantic-current-weakening-faster.html

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10%
Propaganda Score
confidence: 95%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkFact-Check Results

10 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

check_circle Corroborated 6
verified Verified By Reference 2
verified Verified 1
help Insufficient Evidence 1
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“The Atlantic current system, or more formally the Atlantic Meridional Overturning Circulation (AMOC), is more likely to weaken than previously thought.”
CORROBORATED
Multiple sources, including a web search result citing Valentin Portmann and a Guardian article, indicate that the AMOC is more likely to weaken or is closer to a critical state than previously expected.
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wikipedia NEUTRAL — The Atlantic meridional overturning circulation (AMOC) is the main ocean current system in the Atlantic Ocean. It is a component of Earth's ocean circulation system and plays an important role in the …
https://en.wikipedia.org/wiki/Atlantic_meridional_overturnin…
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wikipedia NEUTRAL — Southern Ocean overturning circulation (sometimes referred to as the Southern Meridional overturning circulation (SMOC) or Antarctic overturning circulation) is the southern half of a global thermohal…
https://en.wikipedia.org/wiki/Southern_Ocean_overturning_cir…
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wikipedia NEUTRAL — Thermohaline circulation (THC) is a part of the large-scale ocean circulation driven by global density gradients formed by surface heat and freshwater fluxes. The name thermohaline is derived from the…
https://en.wikipedia.org/wiki/Thermohaline_circulation
+ 3 more evidence sources
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“a new study published in the journal Science Advances... used more refined modeling techniques to get a clearer picture of the future.”
CORROBORATED
Web search results and a cross-reference confirm a study by Valentin Portmann et al. published in Science Advances (2026) using refined projections/modeling to assess the AMOC.
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wikipedia NEUTRAL — The Atlantic meridional overturning circulation (AMOC) is the main ocean current system in the Atlantic Ocean. It is a component of Earth's ocean circulation system and plays an important role in the …
https://en.wikipedia.org/wiki/Atlantic_meridional_overturnin…
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wikipedia NEUTRAL — This article documents notable events, research findings, scientific and technological advances, and human actions to measure, predict, mitigate, and adapt to the effects of global warming and climate…
https://en.wikipedia.org/wiki/2026_in_climate_change
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wikipedia NEUTRAL — The following scientific events occurred, or are scheduled to occur in 2026.
https://en.wikipedia.org/wiki/2026_in_science
+ 3 more evidence sources
verified
“The AMOC is a major system of Atlantic Ocean currents that helps regulate climate by transporting heat from the tropics toward the North Atlantic.”
VERIFIED BY REFERENCE
Wikipedia and multiple scientific sources (Met Office, Medium) explicitly define the AMOC as a system that regulates climate by transporting heat from the tropics to the North Atlantic.
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wikipedia NEUTRAL — The Atlantic meridional overturning circulation (AMOC) is the main ocean current system in the Atlantic Ocean. It is a component of Earth's ocean circulation system and plays an important role in the …
https://en.wikipedia.org/wiki/Atlantic_meridional_overturnin…
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wikipedia NEUTRAL — The North Atlantic Current (NAC), also known as North Atlantic Drift and North Atlantic Sea Movement, is a powerful warm western boundary current within the Atlantic Ocean that extends the Gulf Stream…
https://en.wikipedia.org/wiki/North_Atlantic_Current
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wikipedia NEUTRAL — The North Atlantic Gyre of the Atlantic Ocean is one of five great oceanic gyres. It is a circular ocean current, with offshoot eddies and sub-gyres, across the North Atlantic from the Intertropical C…
https://en.wikipedia.org/wiki/North_Atlantic_Gyre
+ 3 more evidence sources
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“most climate models... generally point to a one-third reduction by 2100.”
CORROBORATED
Web search results mention that CMIP6 models project a decline in AMOC by 2100, with some sources specifically mentioning ranges or a 'one-fifth to one-third' strength relative to historical levels.
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wikipedia NEUTRAL — The Younger Dryas (YD, Greenland Stadial GS-1) was a period in Earth's geologic history that occurred circa 12,900 to 11,700 years Before Present (BP). It is primarily known for the sudden or "abrupt"…
https://en.wikipedia.org/wiki/Younger_Dryas
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wikipedia NEUTRAL — The Atlantic meridional overturning circulation (AMOC) is the main ocean current system in the Atlantic Ocean. It is a component of Earth's ocean circulation system and plays an important role in the …
https://en.wikipedia.org/wiki/Atlantic_meridional_overturnin…
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wikipedia NEUTRAL — Thermohaline circulation (THC) is a part of the large-scale ocean circulation driven by global density gradients formed by surface heat and freshwater fluxes. The name thermohaline is derived from the…
https://en.wikipedia.org/wiki/Thermohaline_circulation
+ 3 more evidence sources
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“this new study puts the figure at a much more substantial 51%.”
CORROBORATED
The specific figure of ~50% (or 51%) weakening by 2100 is cited in the cross-reference to the Portmann et al. paper and related web search results.
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wikipedia NEUTRAL — This article documents notable events, research findings, scientific and technological advances, and human actions to measure, predict, mitigate, and adapt to the effects of global warming and climate…
https://en.wikipedia.org/wiki/2026_in_climate_change
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wikipedia NEUTRAL — The Atlantic meridional overturning circulation (AMOC) is the main ocean current system in the Atlantic Ocean. It is a component of Earth's ocean circulation system and plays an important role in the …
https://en.wikipedia.org/wiki/Atlantic_meridional_overturnin…
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wikipedia NEUTRAL — The following scientific events occurred, or are scheduled to occur in 2026.
https://en.wikipedia.org/wiki/2026_in_science
+ 3 more evidence sources
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“Researchers from France reached this conclusion after combining real-world data with the latest CMIP6 climate models.”
CORROBORATED
Web search results mention the use of CMIP6 models and researchers from France (CNRS) working on climate simulations, and the Portmann study specifically combines observations with these models.
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web search NEUTRAL — They used 24 different CMIP models and found that the most recently available surface temperature data did not accurately reconstruct the AMOC.
https://phys.org/news/2025-01-critical-ocean-current-decline…
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web search NEUTRAL — CMIP6 models project declines in both the wind-driven and thermohaline components of the AMOC out to 2100. Comparing these projections with ongoing observations, like those from RAPID, then provides a…
https://os.copernicus.org/articles/20/589/2024/
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web search NEUTRAL — The AMOC’s climate impact in these model simulations is the same as in previous studies, which have indeed used the same models and often in fact the same model experiments, as this study has analysed…
https://www.realclimate.org/index.php/archives/2025/02/how-w…
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“CMIP6 climate models... is a large international collection of climate models from different groups that simulate past, present and future climate changes.”
VERIFIED
CMIP6 is widely documented across multiple sources (Carbon Brief, WorldClim, CNRS) as an international collection of climate models simulating past, present, and future changes.
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web search NEUTRAL — Future climate data¶. The data available here are CMIP6 downscaled future climate projections. The downscaling and calibration (bias correction) was done with WorldClim v2.1 as baseline climate.
https://worldclim.org/data/cmip6/cmip6climate.html
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web search NEUTRAL — The international climate science community is undertaking an extensive programme of numerical simulations of past and future climates. Its conclusions will contribute significantly to part one of the…
https://www.cnrs.fr/en/press/two-french-climate-models-consi…
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web search NEUTRAL — CMIP6: the next generation of climate models explained - Carbon Brief. Climate models are one of the primary means for scientists to understand how the climate has changed in the past and may change i…
https://twitter.com/hausfath/status/1201411968998899712
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“It used an approach called ridge-regularized linear regression to study several factors at once, such as temperatures in the North Atlantic and salt levels in the South Atlantic.”
CORROBORATED
A web search result explicitly mentions that the researchers applied 'ridge-regularized linear regression' to identify models that mirrored observed data, specifically mentioning North Atlantic temperatures and South Atlantic salt levels.
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web search NEUTRAL — Ridge regression is a method of estimating the coefficients of multiple-regression models in scenarios where the variables are highly correlated. It has been used in many fields including econometrics…
https://en.wikipedia.org/wiki/Ridge_regression
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web search NEUTRAL — The empirical analyses included more than 18,000 new products from 81...
https://www.tandfonline.com/journals/ujar20
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web search NEUTRAL — Then they applied a statistical method called ridge-regularized linear regression, a technique rarely used in climate modeling, to identify which models best mirrored the observed data. The method sla…
https://www.bioscience.com.pk/en/subject/environmental-scien…
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“Combining observations and climate models suggests a 60% stronger weakening of the Atlantic circulation than using models alone.”
INSUFFICIENT EVIDENCE
No evidence was found in the provided search results that specifically mentions a '60% stronger weakening' when combining observations and models.
verified
“Valentin Portmann et al, Observational constraints project a ~50% AMOC weakening by the end of this century, Science Advances (2026). DOI: 10.1126/sciadv.adx4298”
VERIFIED BY REFERENCE
The specific paper title, authors, journal (Science Advances), year (2026), and DOI are directly confirmed by the cross-reference source.
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cross reference SUPPORTS — Valentin Portmann et al, Observational constraints project a ~50% AMOC weakening by the end of this century, Science Advances (2026). DOI: 10.1126/sciadv.adx4298
https://phys.org/news/2026-04-vital-atlantic-current-faster-…
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.