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

Author

Listed:
  • Xuan Liu

    (Tianjin University
    China Institute of Water Resources and Hydropower Research
    Cooperative Innovation Center for Water Safety & Hydro Science)

  • Mingxiang Yang

    (China Institute of Water Resources and Hydropower Research
    Cooperative Innovation Center for Water Safety & Hydro Science)

  • 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
    Hohai University
    Cooperative Innovation Center for Water Safety & Hydro Science)

  • 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)

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.

Suggested Citation

  • Xuan Liu & Mingxiang Yang & Hao Wang & Ke Liu & Ningpeng Dong & Hejia Wang & Limin Zhang & Wen Fan, 2023. "Moisture sources and atmospheric circulation associated with the record-breaking rainstorm over Zhengzhou city in July 2021," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 116(1), pages 817-836, March.
    • Handle: RePEc:spr:nathaz:v:116:y:2023:i:1:d:10.1007_s11069-022-05700-5
    DOI: 10.1007/s11069-022-05700-5
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    References listed on IDEAS

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    1. Laban Lameck Kebacho, 2021. "Anomalous circulation patterns associated with 2011 heavy rainfall over northern Tanzania," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 109(3), pages 2295-2312, December.
    2. Junqiang Yao & Moyan Li & Qing Yang, 2018. "Moisture sources of a torrential rainfall event in the arid region of East Xinjiang, China, based on a Lagrangian model," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 92(1), pages 183-195, November.
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