Evidences for a quasi 60-year North Atlantic Oscillation since 1700 and its meaning for global climate change

The time-integrated record of the North Atlantic Oscillation (INAO) obtained using instrumental and documentary proxy predictors from Eurasia is found to be characterized by a quasi-sexagesimal dominant oscillation since 1650. The INAO multidecadal oscillation is found to well correlate with the Length of the Day (LOD) (since 1650) and the global surface sea temperature (SST) record (since 1850). These findings suggest that INAO is an excellent proxy for global climate change, and that a quasi-sexagesimal cycle exists in the global climate since at least 1700. Finally, the INAO quasi-sexagesimal oscillation well correlates with the quasi-sexagesimal oscillations found in the historical European aurora record since 1700, which suggests that this ~60-year dominant climatic cycle has a solar-astronomical origin.