Data supporting the North Atlantic Climate System Integrated Study (ACSIS) programme, including atmospheric composition; oceanographic and sea-ice observations (2016–2022); and output from ocean, atmosphere, land, and sea-ice models (1950–2050) - Archibald, Alex T.; Sinha, Bablu; Russo, Maria R.; Matthews, Emily; Squires, Freya A.; Abraham, N. Luke; Bauguitte, Stephane J.-B.; Bannan, Thomas J.; Bell, Thomas G.; Berry, David; Carpenter, Lucy J.; Coe, Hugh; et al. (Earth System Science Data, 2025)