We investigate the structure of the Northern Hemisphere atmospheric circulation anomaly patterns associated with the dominant mode of interannual variability in the Tropical Pacific and the dominant mode of quasi-decadal variability in the Atlantic basin. There is evidence that the superposition of the atmospheric patterns associated with these modes possesses an Arctic Oscillation-like structure. We suggest that part of the Arctic Oscillation variability is due to interactions between coupled ocean-atmosphere modes originating in the Tropical Pacific and Atlantic basins.