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originally posted by: punkinworks10
a reply to: charlyv
it has nothing to do with ash falls per se, but more how dust loading and volcanic gasses affect wide spread regional weather patterns. The disruption of rainfall patterns will set socio-political turmoil in motion.
Rain doesnt fall, so people have to move where it does. In the case of egypt this rainfall change occured thousands of miles from egypt proper, in dry farmed mesopotamia and persia or in the mountain high lands of ethiopia or the african lakes region, where the nile waters start.
Volcanic eruptions provide tests of human and natural system sensitivity to abrupt shocks because their repeated occurrence allows the identification of systematic relationships in the presence of random variability. Here we show a suppression of Nile summer flooding via the radiative and dynamical impacts of explosive volcanism on the African monsoon, using climate model output, ice-core-based volcanic forcing data, Nilometer measurements, and ancient Egyptian writings. We then examine the response of Ptolemaic Egypt (305–30 BCE), one of the best-documented ancient superpowers, to volcanically induced Nile suppression. Eruptions are associated with revolt onset against elite rule, and the cessation of Ptolemaic state warfare with their great rival, the Seleukid Empire. Eruptions are also followed by socioeconomic stress with increased hereditary land sales, and the issuance of priestly decrees to reinforce elite authority. Ptolemaic vulnerability to volcanic eruptions offers a caution for all monsoon-dependent agricultural regions, presently including 70% of world population.