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        Killer Volcanoes | Ash Distribution in Earth's Atmosphere

        Scientists use chemical evidence from ice cores and atmospheric circulation patterns to locate a monster volcano that erupted in 1257, in this video from NOVA: Killer Volcanoes. Geologist Nelia Dunbar studies the chemical composition of a layer of volcanic ash deposited in Greenland. Its unique contents provide a signature that can be used to match it to its source. The discovery of identical evidence in an ice core taken from Antarctica suggests the same ash cloud blanketed all of Earth. Based on satellite data and computer modeling of ash clouds in Earth’s atmosphere, climatologist Michael Mills narrows down the possible eruption location to somewhere near the equator. This resource is part of the NOVA Collection.

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