Cleaning up air pollution could weaken vital AMOC ocean current
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- Robert Allen and his team used eight climate models to compare AMOC strength under a high‑emissions IPCC scenario with and without stricter air‑quality controls.
- Mid‑century projections show that, if greenhouse gas emissions keep rising while aerosol pollutants fall, the weakening of the AMOC would be about 33 % larger than it would be with continued aerosol emissions.
- Michael Diamond (Florida State University) notes that cutting aerosols “unmasks” warming, because aerosols normally reflect sunlight and brighten clouds.
- Aerosols have atmospheric lifetimes of less than a week, so their climate effects are localized near emission sources, unlike long‑lived greenhouse gases.
- AMOC weakening could intensify European drought, raise sea levels on the U.S. East Coast, disrupt global monsoons, and plunge northern Europe into colder temperatures, according to earlier studies.
Why it matters: European policymakers face a 33 % larger AMOC weakening by 2050 if aerosol cuts continue, which will intensify drought and raise sea‑level risk for agriculture and coastal infrastructure.
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