Richard Cronin

Not to hammer an issue but the Medieval Warming Period is associated with diminished volcanism. However, the Little Ice Age is associated with greater heating of the Southwest Pacific (due to ocean floor seismic heat). The La Niña conditions of the Southwest Pacific dominated, punctuated by abrupt and strong El Niño conditions in the Eastern Pacific.

A pronounced set of Gravity Waves swept through our section of the galaxy.

"Easterlies converge near the equator and drive surface waters to the west, deepening the thermocline to the west and shoaling it to the east; this allows equatorial upwelling to bring cooler waters on the eastern side. This asymmetry periodically breaks down in the modern-day climate, leading to transient El Niño conditions.”


Abrupt change in tropical Pacific climate mean state during the Little Ice Age - Communications Earth & Environment
nature.com

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