I mean the title literally. Bipolar for Jiamei Lin et al. means the tephra is seen on both poles. The study concerns a chronicle of explosions between 58-7kBC: h/t Glenn Reynolds. So: no AD 536-41 (sadly).
The Northern Hemisphere is more active. This is expected on account here's where the plates lie, with the South being represented not by much more than Chile and New Zealand. Although of course there's some spillover from the equatorial Indonesia.
Younger Dryas looks volcanic, in sum: four (4) eruptions occurred around then. This puts constraints (so improves) upon what this blog has already told you. Add this to the debunking of the Greenland crater and, yeah, we're not looking at a meteor anymore. (A meteor did hit... Chile, where it didn't affect anything north.)
CONSIDER SOURCES 3/29: The opposing pro-meteor team includes Kenneth Tankersley, who ascribes more to meteors (and to comets) than he should.
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