One of *those* topics.
The Pago volcanic eruption at 1370±100 BC, is a possible cause of global cooling and drought. Although it appears to be too early, the dating is not very precise. It was a VEI 6 eruption with a volume of 30 cubic kilometers.
https://en.wikipedia.org/wiki/Pago_(Papua_New_Guinea)
Hekla in Iceland has also been proposed, but it is later, quite a bit smaller, and not near the equator.
