35 miles is not to be laughed about - halfway to
de-facto space, way into the stratosphere. The
particles will hang up there for quite awhile.
https://www.livescience.com/tonga-volcano-ash-record-altitude
Tonga apparently has the (known) record.
A key issue is how much sulfate particulates result. That
seems to be primary to effects on solar IR. Coming out of
the ocean bottom, millions of years worth of dead critters,
the sulfates could be quite high. I don't *think* Tonga
is at a subduction zone - where all those organics get
pulled under and pressure-cooked. So, it could have
been worse.
But, data IS incomplete as of yet. We'll have to wait
and see. But if April seems more like February this year,
well, we'll know why.
We also don't know if the thing will explode AGAIN.
The caldera collapsed ... but in doing so would have
trapped a lot of seawater down there. Bubble bubble .
It seems that there's more seismic/volcanic activity
in the Ring Of Fire lately. Old magmatic reserves
blasted out in the 17/1800s might now have been
replenished. IF there's a new cycle of big blasts
coming, well, we'll all HOPE for some global warming.
A 0.5/1.0C drop in global temperatures will have a
large effect on agricultural output because it will
mean a considerable drop in insolation.