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Mount Toba eruption doesn't seem like it could nearly kill our species
The massive Toba eruption seems to have had little climate impact.
TL;DR
- The Mount Toba eruption, estimated to have occurred 74,000 years ago, was previously thought to have caused massive global cooling and threatened human survival.
- New research using sediment cores from Lake Chala reveals the eruption's climate impact lasted less than two years, with an estimated cooling of about 0.5 degrees Celsius.
- Lake Chala's sediment varves provided a high-resolution record, allowing scientists to precisely date the Toba ash and analyze its climatic effects layer by layer.
- The study suggests the cooling and drying effects were within the natural range of variation experienced by early humans, not a significant threat to their survival.
- The precise dating of the Toba ash within the sediment layers indicates the eruption likely occurred in January or February.
- Further studies using similar high-resolution sedimentary archives are needed to understand the global impact of Toba and other super-eruptions.