PM2.5 reduces the daytime/nighttime urban heat island intensity over mainland China

IF 10.5 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Sustainable Cities and Society Pub Date : 2024-11-22 DOI:10.1016/j.scs.2024.106001

Zihao Feng , Xuhong Wang , Mengqianxi Yu , Yimei Yuan , Bingqian Li

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引用次数: 0

Abstract

PM_2.5 pollution severely threatens people's living environment and health, significantly affect urban heat island (UHI). In this study, in-situ observed data were combined with satellite data via refined pollution intensity classification methods, and the relationships between PM_2.5 and canopy/surface UHI (CUHI/SUHI) were analyzed. PM_2.5 reduced the UHI in nearly all the environments, with more pronounced effects during clear-sky daytime and winter (-0.33 °C for the SUHI) and less pronounced effects at all-sky nights and in summer. For the former, PM_2.5 primarily diminishes the UHI intensity (UHII) by weakening incident radiation; this radiative forcing effect is exacerbated by the combination of PM_2.5 and high humidity, which is further amplified by winter pollution peaks. At night, the UHII primarily influenced by the initial temperature conditions during the day. Less intake of surface energy on high-pollution days, which in turn affects longwave radiation from the surface/canopy at night. Additionally, PM_2.5 has been found to significantly influence UHI through its interaction with potential influential factors and its filtering effect (different PM_2.5 levels correspond to varying conditions of these factors). This study with new insights into the impact of PM_2.5 on UHI could aid in the design of strategies to improve urban heat and pollution environments.

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PM2.5 可降低中国大陆白天/夜间城市热岛强度

PM2.5 污染严重威胁着人们的生活环境和健康，对城市热岛（UHI）有显著影响。本研究通过改进的污染强度分类方法，将现场观测数据与卫星数据相结合，分析了 PM2.5 与冠层/地表 UHI（CUHI/SUHI）之间的关系。几乎在所有环境中，PM2.5都降低了UHI，在晴朗天空的白天和冬季效果更明显（SUHI为-0.33 °C），而在晴朗天空的夜晚和夏季效果不明显。对于前者，PM2.5 主要通过减弱入射辐射来降低超高气温影响强度（UHII）；PM2.5 和高湿度的结合加剧了这种辐射强迫效应，而冬季污染高峰又进一步放大了这种效应。在夜间，UHII 主要受白天初始温度条件的影响。在高污染日，地表能量摄入较少，这反过来又会影响夜间地表/树冠的长波辐射。此外，研究还发现，PM2.5 通过与潜在影响因素的相互作用及其过滤效应（不同的 PM2.5 水平对应于这些因素的不同条件），对 UHI 有显著影响。这项研究对 PM2.5 对 UHI 的影响有了新的认识，有助于设计改善城市热量和污染环境的策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Sustainable Cities and Society Social Sciences-Geography, Planning and Development

CiteScore

22.00

自引率

13.70%

发文量

810

审稿时长

27 days

期刊介绍： Sustainable Cities and Society (SCS) is an international journal that focuses on fundamental and applied research to promote environmentally sustainable and socially resilient cities. The journal welcomes cross-cutting, multi-disciplinary research in various areas, including: 1. Smart cities and resilient environments; 2. Alternative/clean energy sources, energy distribution, distributed energy generation, and energy demand reduction/management; 3. Monitoring and improving air quality in built environment and cities (e.g., healthy built environment and air quality management); 4. Energy efficient, low/zero carbon, and green buildings/communities; 5. Climate change mitigation and adaptation in urban environments; 6. Green infrastructure and BMPs; 7. Environmental Footprint accounting and management; 8. Urban agriculture and forestry; 9. ICT, smart grid and intelligent infrastructure; 10. Urban design/planning, regulations, legislation, certification, economics, and policy; 11. Social aspects, impacts and resiliency of cities; 12. Behavior monitoring, analysis and change within urban communities; 13. Health monitoring and improvement; 14. Nexus issues related to sustainable cities and societies; 15. Smart city governance; 16. Decision Support Systems for trade-off and uncertainty analysis for improved management of cities and society; 17. Big data, machine learning, and artificial intelligence applications and case studies; 18. Critical infrastructure protection, including security, privacy, forensics, and reliability issues of cyber-physical systems. 19. Water footprint reduction and urban water distribution, harvesting, treatment, reuse and management; 20. Waste reduction and recycling; 21. Wastewater collection, treatment and recycling; 22. Smart, clean and healthy transportation systems and infrastructure;