One interesting theme that emerged from the various «last millennium» paleo sessions this year: precisely what was going on w / the tropical Pacific /
ENSO over the past millennium remains quite enigmatic.
Not exact matches
In fact, there is reasonably compelling evidence that changes in drought in the western U.S.
over the
past millennium may, in large part, reflect the forced response of
ENSO to
past volcanic and solar radiative forcing.
Member of the team Alena Kimbrough says, «We've shown
ENSO is an important part of the climate system that has influenced global temperatures and rainfall
over the
past millennium... Our findings, together with climate model simulations, highlight the likelihood that century - scale variations in tropical Pacific climate modes can significantly modulate radiatively forced shifts in global temperature.»
The chart shows the La Niña phase of the El Niño - Southern Oscillation (
ENSO) dominant
over most of the
past millennium and an increase in El Niño frequency last century.
The drivers of change in the
ENSO regime
over the
past millennium differ from those in the mid-Holocene.