Does Urbanization Exacerbate Asymmetrical Changes in Precipitation at Divergent Time Scales in China?

IF 7.3 1区 地球科学 Q1 ENVIRONMENTAL SCIENCES
Earths Future Pub Date : 2024-07-22 DOI:10.1029/2023EF004355
Fanggang Li, Xin Pan, Nan Xu, Xiangjin Meng, Zhiqing Li, Rufat Guluzade, Yang Dai, Yingbao Yang
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Abstract

Urbanization alters the thermal and dynamic environment of the local climate system, resulting in significant impacts on precipitation in both urban and adjacent areas. Nevertheless, there remains a significant gap in our understanding of urbanization-induced effects on asymmetrical, symmetrical, and other precipitation patterns in urban agglomerations (UAs) with divergent background climates and geographic regions at different timescales. Specifically, this asymmetrical change pattern is characterized by an increase in heavy (or light) rainfall and a decrease in light (or heavy) rainfall. Here, we assessed the effects of urbanization on precipitation patterns across 18 UAs situated in diverse background climates and geographical areas in China at different timescales. The results demonstrate that urbanization predominantly alters precipitation patterns in UAs located in the humid region. Specifically, urbanization amplified asymmetrical changes in Yangtze River Delta, Pearl River Delta, Beibu Gulf, Middle Yangtze River, and Guanzhong, but exacerbated symmetrical changes in precipitation in some regions such as Chengdu-Chongqing. Notably, the urbanization effect demonstrates greater significance at the hourly scale, as exemplified in the Yangtze River Delta, Pearl River Delta, and Middle Yangtze River, where the urban impact is nearly twice as pronounced when compared to the daily scale. Moreover, urbanization had either no effect or has a negative impact on precipitation patterns in UAs located within continental and arid regions. This is related to the intensity of urbanization, background climate and complex topography. This finding implies that urban managers should consider the impact of urbanization on precipitation patterns in different contexts to provide scientific guidance for urban planning.

Abstract Image

城市化是否加剧了中国降水在不同时间尺度上的非对称变化?
城市化改变了当地气候系统的热环境和动态环境,从而对城市和邻近地区的降水产生了重大影响。尽管如此,我们对城市化对背景气候和地理区域不同的城市群(UAs)在不同时间尺度上的非对称、对称和其他降水模式的影响的理解仍有很大差距。具体来说,这种非对称变化模式的特点是大雨(或小雨)增多,小雨(或大雨)减少。在此,我们评估了位于中国不同背景气候和地理区域的 18 个统一观测区在不同时间尺度下城市化对降水模式的影响。结果表明,城市化主要改变了位于湿润地区的城市观测区的降水模式。具体而言,城市化扩大了长江三角洲、珠江三角洲、北部湾、长江中游和关中地区降水的非对称变化,但加剧了成渝等地区降水的对称变化。值得注意的是,城市化的影响在小时尺度上更为显著,例如在长江三角洲、珠江三角洲和长江中游地区,城市化的影响比日尺度显著近一倍。此外,城市化对位于大陆和干旱地区的区域观测区的降水模式要么没有影响,要么有负面影响。这与城市化的强度、背景气候和复杂的地形有关。这一发现意味着城市管理者应考虑城市化在不同背景下对降水模式的影响,为城市规划提供科学指导。
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来源期刊
Earths Future
Earths Future ENVIRONMENTAL SCIENCESGEOSCIENCES, MULTIDI-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
11.00
自引率
7.30%
发文量
260
审稿时长
16 weeks
期刊介绍: Earth’s Future: A transdisciplinary open access journal, Earth’s Future focuses on the state of the Earth and the prediction of the planet’s future. By publishing peer-reviewed articles as well as editorials, essays, reviews, and commentaries, this journal will be the preeminent scholarly resource on the Anthropocene. It will also help assess the risks and opportunities associated with environmental changes and challenges.
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