High-latitude eruptions cast shadow over the African monsoon and the flow of the Nile

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Hydrology: Drought, Atmospheric Processes: Clouds And Aerosols, Atmospheric Processes: Precipitation (1854), Volcanology: Atmospheric Effects (0370), Global Change: Abrupt/Rapid Climate Change (4901, 8408)

Scientific paper

Nile River records indicate very low flow following the 1783-1784 Laki volcanic eruption, as well as after other high-latitude volcanic eruptions. As shown by climate model simulations of the Laki eruption, significant cooling (-1° to -3°C) of the Northern Hemisphere land masses during the boreal summer of 1783 resulted in a strong dynamical effect of weakening the African and Indian monsoon circulations, with precipitation anomalies of -1 to -3 mm/day over the Sahel of Africa, thus producing the low Nile flow. Future high-latitude eruptions would significantly impact the food and water supplies in these areas. Using observations of the flow of the Nile River, this new understanding is used to support a date of 939 for the beginning of the eruption of the Eldgjá volcano in Iceland, the largest high-latitude eruption of the past 1500 years.

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