And this was half-bad, half-good news for early humans living in Africa.
Mild disaster
“Sulfate aerosols in the stratosphere are more effectively transported to the hemisphere that is experiencing winter,” Park says. For our ancestors, this meant the Toba’s sulfate veil drifted northwards and thinned over their heads slightly sooner than it would if the eruption happened in the northern summer. On the other hand, the Northern Hemisphere has far more land, which cools down faster and further than the ocean, so a northern-winter eruption must have cooled the globe a bit more than the same eruption in July. But overall, compared against the broader climate change trajectory, the
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