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The impact of air quality control efforts on the Atlantic Meridional Overturning Circulation

T Hassan, RJ Allen, W Liu, S Shim, T van Noije, P Le Sager, N Oshima, M Deushi, CA Randles, FM O’Connor

Observations indicate the Atlantic Meridional Overturning Circulation (AMOC)−a fundamental component of the ocean’s global conveyor belt−is weakening. Although causes remain uncertain, AMOC weakening is consistent with increasing greenhouse gases (GHGs). Recent studies also suggest that anthropogenic emissions associated with air pollution, such as aerosols, can significantly impact the AMOC. Here, we use four state-of-the-art chemistry-climate models to quantify how efforts to improve future air quality via near-term climate forcer (NTCF) mitigation will impact the AMOC. Non-methane NTCF (NMNTCF) mitigation, which includes aerosols, ozone and precursor gases alone, induces end-of-century AMOC weakening by up to 10%. However, all-NTCF mitigation, which also includes methane reductions, offsets this weakening. The AMOC responses are best explained by the North Atlantic radiative forcing. Thus, efforts to improve air quality must also target methane and other GHGs including carbon dioxide to avoid additional climate change, including weakening of the world’s major ocean circulation

Bibliografische gegevens

T Hassan, RJ Allen, W Liu, S Shim, T van Noije, P Le Sager, N Oshima, M Deushi, CA Randles, FM O’Connor. The impact of air quality control efforts on the Atlantic Meridional Overturning Circulation
Journal: Nature Commun. Earth Environ., Year: 2022, doi: -

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