Papers by Allegra Legrande
Climate of the Past, 2022
The Ptolemaic era (305-30BCE) represents an important period of Ancient Egyptian history known fo... more The Ptolemaic era (305-30BCE) represents an important period of Ancient Egyptian history known for East Asian) experienced suppression of rainfall >1 mm/day during the monsoon (JJAS) season averaged for 2 years after each eruption. A substantial suppression of north African and Indian summer monsoon over the Nile River headwater region vigorously affects the river flow in the catchment and river discharge. River mass flow consecutively decreases by up to more than 30% relative to an unperturbed from volcanoes annual mean flow for 2 years after the tropical eruption. A moderate decrease of up to 15-20% is produced after each of the remaining eruptions. These results show that the first eruption produces a strong hydroclimate response, and the following 3 eruptions prolonged the drying conditions. These results also support the contention that the observed association between ice-core-based signals of explosive volcanism and the hydroclimatic impact of these eruptions during the Ptolemy era, including the suppression of the critical for agriculture Nile summer flooding.
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Papers by Allegra Legrande