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.
So, the 729.9 W / m ^ 2 shown
during the hours just before and after
noon on a dry clear - sky day should be reading somewhat below 729.9 / (1 — 0.313) or less than 1062 W / m ^ 2 by measurement, near
noon, on the equator, for the atmosphere itself, in those conditions, would not be absorbing as much direct
solar radiation as the average shows in column C either (no clouds).