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Adriano Mazzarella & Nicola Scafetta

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

Theor Appl Climatol
DOI 10.1007/s00704-011-0499-4


Mazzarella-_Scafetta-60-yrThe 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.