Is the volatility and non-stationarity of the Atlantic Multidecadal Oscillation (AMO) changing?

Is the volatility and non-stationarity of the Atlantic Multidecadal Oscillation (AMO) changing?
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doi
10.1016/j.gloplacha.2020.103160
Article type
Journal
https://people.iut.ac.ir/en/rezamodarres/content/1607348