I.e.
solar activity was high in most of the 20th centiry and then peaked in about 1985, together with a 20 - 30 year heat lag (
since it remained high until 1996 as well), and oceans take a few decades to equilbrate, (the same as summer takes about 6 weeks to reach maximum temperature after the summer solstice, and every day it takes a few hours after
noon to reach maximum temperature), so the earth has taken a few decades to reach maximum temperature after the long high in
solar activity during the 20th century, and will now go down in temperature over the next few decades, with now both a negative PDO, and reduced
solar activity.