Typhoon Rainfall Intensification by Urban Dynamical Effects in Shanghai

Caijun Yue; Changhai Liu; Liping Deng; Zhihui Han; Xiaofeng Wang; Yao Yao; Wen Gu; Yuqi Tang; Xiangyu Ao; Bingxin Ma; Yiwen Lu

doi:10.1029/2025GL116313

Typhoon Rainfall Intensification by Urban Dynamical Effects in Shanghai

Caijun Yue, Changhai Liu, Liping Deng, Zhihui Han, Xiaofeng Wang, Yao Yao, Wen Gu, Yuqi Tang, Xiangyu Ao, Bingxin Ma, Yiwen Lu

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

Based on observational data from 17 typhoons affecting Shanghai between 2012 and 2020, this study investigates the spatial characteristics of typhoon rainfall, with a multi-case composite analysis. The results show that storm total rainfall in the urban area is approximately 20% higher than in the rural area. Moreover, the chance of storm total precipitation exceeding 100 mm in the urban area is approximately 2.7 times higher than that in the rural area. This spatial disparity underscores the impact of urban dynamical effects, where reduced local urban wind speeds contribute to a twofold difference in urban-rural wind speeds, thereby enhancing the near-surface convergence and rainfall in urban areas. Conversely, minimal spatial variations in thermal and moisture conditions indicate negligible influences from urban heat island and other thermodynamic factors.

Original language	English
Article number	e2025GL116313
Journal	Geophysical Research Letters
Volume	52
Issue number	13
DOIs	https://doi.org/10.1029/2025GL116313
State	Published - Jul 16 2025
Externally published	Yes

Keywords

dynamical effects of urban
typhoon rainfall in Shanghai
typhoons
urban heat island
urban rainfall enhancement

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10.1029/2025GL116313

Cite this

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title = "Typhoon Rainfall Intensification by Urban Dynamical Effects in Shanghai",

abstract = "Based on observational data from 17 typhoons affecting Shanghai between 2012 and 2020, this study investigates the spatial characteristics of typhoon rainfall, with a multi-case composite analysis. The results show that storm total rainfall in the urban area is approximately 20\% higher than in the rural area. Moreover, the chance of storm total precipitation exceeding 100 mm in the urban area is approximately 2.7 times higher than that in the rural area. This spatial disparity underscores the impact of urban dynamical effects, where reduced local urban wind speeds contribute to a twofold difference in urban-rural wind speeds, thereby enhancing the near-surface convergence and rainfall in urban areas. Conversely, minimal spatial variations in thermal and moisture conditions indicate negligible influences from urban heat island and other thermodynamic factors.",

keywords = "dynamical effects of urban, typhoon rainfall in Shanghai, typhoons, urban heat island, urban rainfall enhancement",

author = "Caijun Yue and Changhai Liu and Liping Deng and Zhihui Han and Xiaofeng Wang and Yao Yao and Wen Gu and Yuqi Tang and Xiangyu Ao and Bingxin Ma and Yiwen Lu",

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doi = "10.1029/2025GL116313",

language = "English",

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TY - JOUR

T1 - Typhoon Rainfall Intensification by Urban Dynamical Effects in Shanghai

AU - Yue, Caijun

AU - Liu, Changhai

AU - Deng, Liping

AU - Han, Zhihui

AU - Wang, Xiaofeng

AU - Yao, Yao

AU - Gu, Wen

AU - Tang, Yuqi

AU - Ao, Xiangyu

AU - Ma, Bingxin

AU - Lu, Yiwen

PY - 2025/7/16

Y1 - 2025/7/16

N2 - Based on observational data from 17 typhoons affecting Shanghai between 2012 and 2020, this study investigates the spatial characteristics of typhoon rainfall, with a multi-case composite analysis. The results show that storm total rainfall in the urban area is approximately 20% higher than in the rural area. Moreover, the chance of storm total precipitation exceeding 100 mm in the urban area is approximately 2.7 times higher than that in the rural area. This spatial disparity underscores the impact of urban dynamical effects, where reduced local urban wind speeds contribute to a twofold difference in urban-rural wind speeds, thereby enhancing the near-surface convergence and rainfall in urban areas. Conversely, minimal spatial variations in thermal and moisture conditions indicate negligible influences from urban heat island and other thermodynamic factors.

AB - Based on observational data from 17 typhoons affecting Shanghai between 2012 and 2020, this study investigates the spatial characteristics of typhoon rainfall, with a multi-case composite analysis. The results show that storm total rainfall in the urban area is approximately 20% higher than in the rural area. Moreover, the chance of storm total precipitation exceeding 100 mm in the urban area is approximately 2.7 times higher than that in the rural area. This spatial disparity underscores the impact of urban dynamical effects, where reduced local urban wind speeds contribute to a twofold difference in urban-rural wind speeds, thereby enhancing the near-surface convergence and rainfall in urban areas. Conversely, minimal spatial variations in thermal and moisture conditions indicate negligible influences from urban heat island and other thermodynamic factors.

KW - dynamical effects of urban

KW - typhoon rainfall in Shanghai

KW - typhoons

KW - urban heat island

KW - urban rainfall enhancement

UR - https://www.scopus.com/pages/publications/105009819214

U2 - 10.1029/2025GL116313

DO - 10.1029/2025GL116313

M3 - Article

AN - SCOPUS:105009819214

SN - 0094-8276

VL - 52

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 13

M1 - e2025GL116313

ER -

Typhoon Rainfall Intensification by Urban Dynamical Effects in Shanghai

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