Second, a series of mildly explosive volcanoes, which increased stratospheric
particles, likely had more of a
cooling effect than previously recognized.35, 36,37 Third, the
high incidence of La Niña events in the last 15 years has played a role in the observed trends.29, 38 Recent analyses13 suggest that more of the increase in heat
energy during this period has been transferred to the deep ocean than previously.