One can use the formula for estimating slopes to track changes in the global ocean anomaly. I fit a straight line to the first five years of data to get a starting anomaly and slope. Then I stepped forward one year along that track to get a new value for the anomaly, estimated the slope for the next 5 year interval (Δp) and repeated the process. The fit for the last five years was a linear projection based on the last slope found. Here is the calculation for the repeated steps.
The warming indicates the rate is not steady as the track anomaly and slope show.
There seems to have been a slight jump in the rate of ocean warming after the mid 70s but it's difficult to characterize the fluctuations.
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