Heavier Precipitation in Response to Longer-Lasting Tropical Cyclones and Rapid Urbanization over the Yangtze River Delta of Eastern China

Lihong Wei, Xihui Gu*, Louise J. Slater, Yangchen Lai*, Dongdong Kong, Jianyu Liu, Jianfeng Li, Xiang Zhang

*Corresponding author for this work

    Research output: Contribution to journalJournal articlepeer-review

    2 Citations (Scopus)

    Abstract

    Precipitation induced by tropical cyclones (TCs) over cities is associated with both TC duration and urbanization; however, observational evidence of the impacts of TC duration and urbanization on precipitation in megalopolises is limited. In this study, the Yangtze River Delta (YRD) of eastern China is taken as a typical region because this region has been experiencing both rapid urbanization processes and frequent TC attacks. During 1979–2018, we find reduced translation speed and increased meandering of TCs over the YRD, resulting in increased TC duration and the proportion of TC stalling in this region. The correlation between TC duration and TC-induced precipitation amount is significant across the YRD region but is relatively weak in areas with faster urbanization expansion rates. Long-term increases in TC-induced precipitation are found in both rural and urban areas but are larger for urban areas. Urbanization plays an important role in enhancing TC-induced precipitation over urban areas of the YRD region. Areas with faster urbanization expansion rates and longer TC durations have larger TC-induced precipitation, suggesting that urban expansion and TC duration jointly amplify TC-induced precipitation. Our findings suggest that urban planners, in areas potentially affected by TCs, should consider adaptation measures to mitigate the impacts of urban rainstorms amplified by the combined effects of TCs and urbanization.

    Original languageEnglish
    Pages (from-to)403-418
    Number of pages16
    JournalJournal of Climate
    Volume37
    Issue number2
    Early online date18 Dec 2023
    DOIs
    Publication statusPublished - 15 Jan 2024

    Scopus Subject Areas

    • Atmospheric Science

    User-Defined Keywords

    • Extreme events
    • Tropical cyclones
    • Urban meteorology

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