I had to write this post because the title is just too catchy. Any pause is well explained by the CSALT model — see Figure 1 below.
The factors are a 27-year tidal maximum period identified by Brier  and periods aligned with the Quasi-Biennial Oscillation (QBO) and Quasi-Triennial Oscillation (QTO). These are small and subtle but contribute to raising the coorelation coefficient or R to a value above 0.996 for that detailed a profile. More details on this later.
 G. W. Brier, “Long‐range prediction of the zonal westerlies and some problems in data analysis,” Reviews of Geophysics, vol. 6, no. 4, pp. 525–551, 1968.