My guess. We know the cycle is probably 70 years. So I’m guess the cycle goes from little variation to lots of variation and back. Depending on AMO/PDO.
The earliest part of the graph (the beginning of satellite era) has larger oscillations and would have had even larger as you moved back in time if the satellites had been up earlier..
Any speculation as to why the 1980’s had little variation and recent years have had significant variation?
My guess. We know the cycle is probably 70 years. So I’m guess the cycle goes from little variation to lots of variation and back. Depending on AMO/PDO.
The earliest part of the graph (the beginning of satellite era) has larger oscillations and would have had even larger as you moved back in time if the satellites had been up earlier..