12/26/2023 0 Comments Corona weather total rainfall![]() In addition to natural variability, human influence may also have a dramatic impact on extreme precipitations 6, 7, 8. From the perspective of climate variability, the strong Indian Ocean Dipole event in 2019 2, the notably delayed withdrawal of the Meiyu-Baiu front caused by enhanced Arabian Sea warming 5, and the sub-seasonal phase transition of the North Atlantic Oscillation 1 were postulated as contributors of the unprecedented 2020 extreme summer rainfall in China. Extreme precipitation can induce severe stress on aquatic and terrestrial ecosystems, societal infrastructure, and socioeconomics 3, 4. Eastern China, as one of the most urbanized and densely populated regions in the world, suffered severe damages and losses from this disaster. The accumulated rainfall has broken its 60-year record since 1961 1, 2. In the early and middle summer of 2020, persistent extreme precipitation events occurred in eastern China. We conclude that through abrupt emissions reductions, the COVID-19 pandemic contributed importantly to the 2020 extreme summer rainfall in eastern China. Modeling experiments show that the reduction in aerosols had a stronger impact on precipitation than the decrease of greenhouse gases did. The latter enhanced moisture convergence to eastern China and further intensified rainfall in that region. Here, we investigate such connections and show that the abrupt emissions reductions during the pandemic strengthened the summer atmospheric convection over eastern China, resulting in a positive sea level pressure anomaly over northwestern Pacific Ocean. ![]() By disrupting human activities, substantial reductions in anthropogenic emissions of greenhouse gases and aerosols might have affected regional precipitation in many ways. The extreme summer rainfall occurred during the COVID-19 pandemic, which started in China in early 2020 and spread rapidly across the globe. Record rainfall and severe flooding struck eastern China in the summer of 2020.
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