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

TL;DR

This study identifies a consistent quasi 60-year oscillation in the North Atlantic Oscillation since 1650, linking it to global climate change and suggesting a solar-astronomical origin for this cycle.

Contribution

It reveals a persistent 60-year cycle in NAO since 1700 and demonstrates its correlation with global temperature, length of day, and aurora records, indicating a solar influence.

Findings

A quasi 60-year NAO oscillation since 1650.

Strong correlation between INAO and global temperature records.

The 60-year cycle aligns with historical aurora data, implying solar-astronomical influence.

Abstract

The North Atlantic Oscillation (NAO) obtained using instrumental and documentary proxy predictors from Eurasia is found to be characterized by a quasi 60-year dominant oscillation since 1650. This pattern emerges clearly once the NAO record is time integrated to stress its comparison with the temperature record. The integrated NAO (INAO) is found to well correlate with the length of the day (since 1650) and the global surface sea temperature record HadSST2 and HadSST3 (since 1850). These findings suggest that INAO can be used as a good proxy for global climate change, and that a 60-year cycle exists in the global climate since at least 1700. Finally, the INAO ~60-year oscillation well correlates with the ~60- year oscillations found in the historical European aurora record since 1700, which suggests that this 60-year dominant climatic cycle has a solar-astronomical origin.