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Urban development pattern's influence on extreme rainfall occurrences.

Long Yang1,2, Yixin Yang3,4, Ye Shen3,4

  • 1School of Geography and Ocean Sciences, Nanjing University, Nanjing, China. yanglong@nju.edu.cn.

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|May 11, 2024
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Summary
This summary is machine-generated.

Urban development patterns significantly impact extreme rainfall. Compact cities see increased rainfall frequency downtown, unlike dispersed cities, due to thermal and aerodynamic effects.

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Area of Science:

  • Climatology
  • Urban Meteorology
  • Environmental Science

Background:

  • Global urban populations are growing, leading to diverse urban development patterns.
  • Existing research indicates urban signatures in rainfall anomalies, but a global understanding of how rainfall responds to different urban development patterns is lacking.

Purpose of the Study:

  • To investigate the global divergence in extreme rainfall exposure linked to distinct urban development patterns.
  • To understand the mechanisms driving these divergent rainfall responses.

Main Methods:

  • Analysis of extreme rainfall data for 1790 inland cities worldwide.
  • Utilizing convection-permitting simulations to model urban-rural interactions.

Main Results:

  • Cities with compact development show greater increases in extreme rainfall frequency over downtown areas compared to rural surroundings.
  • Cities with dispersed development exhibit diminished anomalies in extreme rainfall frequency.
  • Convection-permitting simulations indicate that compact urban footprints enhance urban-rural thermal contrasts and aerodynamic disturbances, driving rainfall divergence.

Conclusions:

  • Urban development patterns significantly influence extreme rainfall frequency, with compact development exacerbating it in city centers.
  • These findings provide crucial insights for city-level climate hazard mitigation strategies, especially in rapidly urbanizing regions.