Moisture sources and atmospheric circulation associated with the record-breaking rainstorm over Zhengzhou city in July 2021

Xuan Liu, Mingxiang Yang (), Hao Wang, Ke Liu, Ningpeng Dong, Hejia Wang, Limin Zhang and Wen Fan
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Xuan Liu: Tianjin University
Mingxiang Yang: China Institute of Water Resources and Hydropower Research
Hao Wang: China Institute of Water Resources and Hydropower Research
Ke Liu: Hydrology Bureau of Yellow River Conservancy Commission
Ningpeng Dong: China Institute of Water Resources and Hydropower Research
Hejia Wang: China Institute of Water Resources and Hydropower Research
Limin Zhang: China Institute of Water Resources and Hydropower Research
Wen Fan: China Institute of Water Resources and Hydropower Research

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2023, vol. 116, issue 1, No 35, 817-836

Abstract: Abstract On 20 July 2021, the city of Zhengzhou in Henan Province, China experienced a record-breaking rainfall event (“21·7”) with a maximum hourly precipitation of 201.9 mm, which caused a significant loss of life and property. Knowledge of the moisture sources and atmospheric circulations associated with this rainstorm can help understand the mechanisms of such extreme rainfall events for more accurate forecasts in the future. To this end, we investigate the moisture sources and pathways related to the “21·7” extreme rainfall with the water vapor budget analysis and the Hybrid Single-Particle Lagrangian Integrated Trajectory model. In addition, the role of the circulation pattern is analyzed systematically based on ERA5 reanalysis. Results indicate that the Western Pacific Ocean and East China contribute 68.8% and 29.5% of the moisture to the extreme rainfall over Zhengzhou, respectively. Under the impact of tropical cyclone In-fa and Cempaka, and Western Pacific Subtropical High, the stable and abundant moisture transports toward Zhengzhou. Strong convergence and dynamic uplift trigger the convection due to the low vortex and the topography of mountains. Our findings can provide implications for short-term, extreme rainfall and flood forecasts under a changing environment.

Keywords: The extreme rainfall; Moisture sources; Lagrangian trajectory model; Atmospheric circulation; Water vapor budget (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1007/s11069-022-05700-5

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