{"title":"上海城市动力效应下的台风降雨增强","authors":"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","DOIUrl":null,"url":null,"abstract":"<p>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.</p>","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 13","pages":""},"PeriodicalIF":4.6000,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL116313","citationCount":"0","resultStr":"{\"title\":\"Typhoon Rainfall Intensification by Urban Dynamical Effects in Shanghai\",\"authors\":\"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\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>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.</p>\",\"PeriodicalId\":12523,\"journal\":{\"name\":\"Geophysical Research Letters\",\"volume\":\"52 13\",\"pages\":\"\"},\"PeriodicalIF\":4.6000,\"publicationDate\":\"2025-07-02\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL116313\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Geophysical Research Letters\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1029/2025GL116313\",\"RegionNum\":1,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geophysical Research Letters","FirstCategoryId":"89","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1029/2025GL116313","RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
Typhoon Rainfall Intensification by Urban Dynamical Effects in Shanghai
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.
期刊介绍：
Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.
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