Significant contribution of urban morphological diversity to urban surface thermal heterogeneity

IF 6 2区 工程技术 Q1 ENVIRONMENTAL SCIENCES
Jiyao Zhao , Le Yu , Lei Zhao , Haohuan Fu , Peng Gong
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引用次数: 0

Abstract

Urban heat island (UHI) effect, exacerbated by global warming, poses significant public health threats and socioeconomic damages. Previous UHI studies have largely overlooked thermal heterogeneity within urban areas, as existing research on urban morphology and intra-city thermal variability is mostly limited to the city scale due to the difficulty of acquiring detailed urban morphology data on a larger scale, which result in a lack of comprehensive global understanding of the relationship between urban morphological diversity and thermal heterogeneity. To address this gap, our study utilized satellite-based land surface temperature (LST) observations and the global local climate zone (LCZ) dataset to quantify the urban morphological diversity and urban surface thermal heterogeneity, and further investigate the relationship between them across 1024 cities worldwide. Our results demonstrate a robust correlation between urban morphological diversity and urban thermal heterogeneity, with urban morphological diversity accounting for a median of 15.40 % and 20.57 % of daytime and nighttime variability respectively. This relationship is further influenced by the regional background climate, shaping the intracity thermal variabilities. Across different climate regimes, an increase in urban morphological diversity is consistently associated with elevated urban thermal heterogeneity in each region of the world. These findings highlight the need for policymakers to address intracity thermal heterogeneity and emphasize the importance of tailored urban heat mitigation strategies that account for urban morphological diversity and local climate conditions.
城市形态多样性对城市地表热异质性的显著贡献
全球变暖加剧了城市热岛效应,造成了重大的公共卫生威胁和社会经济损失。以往的城市热岛研究在很大程度上忽视了城市内部的热异质性,因为现有的城市形态和城市内部热变的研究大多局限于城市尺度,因为难以获得更大尺度的详细城市形态数据,导致缺乏对城市形态多样性和热异质性关系的全面的全球理解。为了解决这一问题,本研究利用基于卫星的地表温度(LST)观测数据和全球局部气候带(LCZ)数据集,量化了全球1024个城市的城市形态多样性和城市地表热异质性,并进一步研究了它们之间的关系。研究结果表明,城市形态多样性与城市热异质性之间存在显著相关性,城市形态多样性分别占白天和夜间变化的中位数15.40%和20.57%。这种关系进一步受到区域背景气候的影响,形成了城市内热变化。在不同的气候条件下,城市形态多样性的增加始终与世界各区域城市热异质性的增加有关。这些发现强调了决策者解决城市热异质性的必要性,并强调了考虑城市形态多样性和当地气候条件的定制城市热缓解策略的重要性。
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来源期刊
Urban Climate
Urban Climate Social Sciences-Urban Studies
CiteScore
9.70
自引率
9.40%
发文量
286
期刊介绍: Urban Climate serves the scientific and decision making communities with the publication of research on theory, science and applications relevant to understanding urban climatic conditions and change in relation to their geography and to demographic, socioeconomic, institutional, technological and environmental dynamics and global change. Targeted towards both disciplinary and interdisciplinary audiences, this journal publishes original research papers, comprehensive review articles, book reviews, and short communications on topics including, but not limited to, the following: Urban meteorology and climate[...] Urban environmental pollution[...] Adaptation to global change[...] Urban economic and social issues[...] Research Approaches[...]
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