The study examines the interdecadal variability in North Atlantic sea surface temperature (SST) and its associated atmospheric conditions. Using a century of surface marine observations, the research identifies distinct patterns of ocean-atmosphere interaction. Middle and high-latitude SST display long-term fluctuations with negative anomalies before 1920 and during the 1970s and 1980s, while positive SST conditions prevailed from about 1930 to 1960. The interdecadal SST variability is characterized by basin-scale patterns with maxima near Iceland, the Labrador Sea, and near Bermuda. Corresponding atmospheric conditions show circulation anomalies in the mid-ocean basin, centered at 45°N and 35°W, with anomalous cyclonic circulation during warm SST years and anticyclonic circulation during cold SST years. These anomalies are strongest in winter. Short-term interannual variability is also examined, showing zonally elongated centers of action that are negatively correlated. The study suggests that interdecadal variability may be governed by basin-scale dynamical interactions between large-scale oceanic circulation and the atmosphere. The spatial distribution of interdecadal SST variability supports the hypothesis that changes in the North Atlantic Ocean circulation, particularly the thermohaline circulation (THC), are involved. Observational and modeling evidence indicates that the interdecadal fluctuations in North Atlantic SST are linked to significant changes in ocean circulation, including sea ice conditions in the Greenland and Iceland seas.The study examines the interdecadal variability in North Atlantic sea surface temperature (SST) and its associated atmospheric conditions. Using a century of surface marine observations, the research identifies distinct patterns of ocean-atmosphere interaction. Middle and high-latitude SST display long-term fluctuations with negative anomalies before 1920 and during the 1970s and 1980s, while positive SST conditions prevailed from about 1930 to 1960. The interdecadal SST variability is characterized by basin-scale patterns with maxima near Iceland, the Labrador Sea, and near Bermuda. Corresponding atmospheric conditions show circulation anomalies in the mid-ocean basin, centered at 45°N and 35°W, with anomalous cyclonic circulation during warm SST years and anticyclonic circulation during cold SST years. These anomalies are strongest in winter. Short-term interannual variability is also examined, showing zonally elongated centers of action that are negatively correlated. The study suggests that interdecadal variability may be governed by basin-scale dynamical interactions between large-scale oceanic circulation and the atmosphere. The spatial distribution of interdecadal SST variability supports the hypothesis that changes in the North Atlantic Ocean circulation, particularly the thermohaline circulation (THC), are involved. Observational and modeling evidence indicates that the interdecadal fluctuations in North Atlantic SST are linked to significant changes in ocean circulation, including sea ice conditions in the Greenland and Iceland seas.