Spatiotemporal variations of surface and canopy urban heat islands intensities and their divergence modulated by aerosol-driven radiative forcing in eastern China's urban agglomerations

IF 13.3 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Sustainable Cities and Society Pub Date : 2026-02-01 Epub Date: 2025-12-30 DOI:10.1016/j.scs.2025.107106

Yimei Yuan , Xuhong Wang , Bingqian Li , Zihao Feng , Chengyu Wang , Jiahang Yang , Jiahui Yang

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引用次数: 0

Abstract

Urban agglomerations, as focal points of intense human and economic activities, face growing ecological and environmental challenges due to industrial clustering, high population density, and uncontrolled urban expansion. These factors collectively limit sustainable socioeconomic development and ecological balance. Despite extensive urban heat island intensity (UHII) research, the distinct patterns of surface (SUHII) and canopy (CUHII) urban heat island intensities, particularly their responses to aerosol-driven radiative forcing, remain poorly understood. Mann-Kendall trend analysis, random forest modeling, and aerosol radiative forcing assessment based on multisource remote sensing and ground meteorological station data (2003-2023) were integrated to analyze SUHII and CUHII variations across eight major eastern China's urban agglomerations. The key findings are as follows: (1) SUHII consistently surpasses CUHII, with greater daytime effects in southern urban agglomerations but reversed nighttime trends in northern urban agglomerations; (2) Daytime SUHII increased significantly at the 95% confidence level, peaking in spring and summer; nighttime CUHII increase more marked, with 50% of cities showing significant summer rises; and (3) the daytime SUHII is governed by surface characteristic factors, while the nighttime SUHII is jointly controlled by human activities and background climatic factors. Both the daytime and nighttime CUHII are primarily driven by human activities. (4) aerosol-driven spatially and seasonally heterogeneous radiative forcing increases the UHII in northern urban agglomerations (BTH, CP, and GP) but suppresses it in southern urban agglomerations (YRD, CY, and YRMR), except in winter (cooling effect). The results provide insights into UHII-aerosol interaction mechanisms and support region-specific thermal environment management strategies.

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气溶胶驱动辐射强迫对中国东部城市群地表和冠层城市热岛强度的时空变化及其辐散度的调节

城市群作为人类活动和经济活动的集中地，由于产业集聚、人口密度高、城市无序扩张等原因，面临着日益严峻的生态环境挑战。这些因素共同制约着社会经济的可持续发展和生态平衡。尽管对城市热岛强度（UHII）进行了广泛的研究，但地表（SUHII）和冠层（CUHII）城市热岛强度的不同模式，特别是它们对气溶胶驱动的辐射强迫的响应，仍然知之甚少。基于2003-2023年多源遥感和地面气象站数据，综合Mann-Kendall趋势分析、随机森林模型和气溶胶辐射强迫评估，分析了中国东部8个主要城市群的SUHII和CUHII变化。主要发现如下：(1)SUHII持续优于CUHII，在南方城市群白天效应更大，而在北方城市群夜间趋势相反；(2)白天SUHII在95%置信水平上显著增加，在春夏季达到峰值；夜间CUHII增长更为明显，50%的城市在夏季出现显著增长；(3)白天受地表特征因子控制，夜间受人类活动和背景气候因子共同控制。白天和夜间的CUHII主要是由人类活动驱动的。(4)气溶胶驱动的空间和季节非均质辐射强迫增加了北部城市群（BTH、CP和GP）的UHII，但抑制了南部城市群（YRD、CY和YRMR）的UHII，冬季除外（冷却效应）。研究结果为深入了解uhii -气溶胶相互作用机制提供了见解，并为区域热环境管理策略提供了支持。

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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;