Oops! Spreadsheet error. 11.25 years should be 47.25 years making 15.75 a 3rd not a 5th. I have to revise the text below or do a do over, but 47.25 years with a 15.75 year shift results in a 31.5 year "pseudo" oscillation in the NH. Since the actual solar ~11.25 year cycle ranges by approximately 2.25 years from ~9 years to ~13.5years there would be a range of NH "pseudo" oscillation periods.
I left the solar in Wm-2. If you consider a 0.8Wm-2 ocean imbalance, once the "charging" is complete or hits a charging speed bump, the imbalance would add to the surface energy instead of being absorbed. With an average ocean temperature of about 18 C, stopping a 0.8Wm-2 imbalance would basically increase the average surface temperature by .15 C degrees. That increased surface temperature would interact with the atmosphere potentially amplifying the impact by 2 or up to 0.3 C degrees. For example if instead of just staying "average" that energy is transported poleward it would have an impact of 0.17C potentially amplified to 0.34C degrees. So the reduction in imbalance could produce between roughly 0.2C for a round number and 0.34 C. Solar in this case would not be driving climate as much as just recharging climate or adjusting the climate charging rate.
There are plenty of "other" potential feedback items like water vapor and ice/snow melt, but if solar was at one time assumed to cause the 1940s temperature peak, shifting into a lower gear could have extended that solar forcing to ~1985.
Since there is not real way to determine how the internal oscillations/damped response curves will synchronize with so many irregular forcing/feedback mechanisms, the path shift or gear shift is just one of many possibilities. It does look interesting though.
Since solar/volcanic impact varies regionally, I may be able to compare a few different regions to see what periods may be more likely to synchronize.
UpDate: Since I had the spreadsheet error I revised the last chart to make is less confusing hopefully and included the southern hemisphere ocean band fro 30S to 60S for comparison. There is more involved than just solar, so I scaled the ERSST ocean data by 0.75 to improve the fit.
Just to be complete here are other ocean regions.
And this one is the longest instrumental record.