上海城市动力效应下的台风降雨增强

IF 4.6 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Caijun Yue, Changhai Liu, Liping Deng, Zhihui Han, Xiaofeng Wang, Yao Yao, Wen Gu, Yuqi Tang, Xiangyu Ao, Bingxin Ma, Yiwen Lu
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引用次数: 0

摘要

利用2012—2020年影响上海的17次台风观测资料,采用多案例复合分析方法,研究了台风降水的空间特征。结果表明,城区暴雨总降雨量比农村地区高约20%。城市地区暴雨总降水量超过100 mm的概率约为农村地区的2.7倍。这种空间差异强调了城市动力效应的影响,其中城市局部风速的降低导致城乡风速的双重差异,从而增强了城市地区的近地面辐合和降雨。相反,热力和湿度条件的最小空间变化表明城市热岛和其他热力因素的影响可以忽略不计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Typhoon Rainfall Intensification by Urban Dynamical Effects in Shanghai

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.

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来源期刊
Geophysical Research Letters
Geophysical Research Letters 地学-地球科学综合
CiteScore
9.00
自引率
9.60%
发文量
1588
审稿时长
2.2 months
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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