Fraction-dependent variations in cooling efficiency of urban trees across global cities

IF 10.6 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL ISPRS Journal of Photogrammetry and Remote Sensing Pub Date : 2024-08-09 DOI:10.1016/j.isprsjprs.2024.07.026
Wenfeng Zhan , Chunli Wang , Shasha Wang , Long Li , Yingying Ji , Huilin Du , Fan Huang , Sida Jiang , Zihan Liu , Huyan Fu
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Abstract

Investigating the relationship between cooling efficiency (CE) and tree cover percentage (TCP) is critical for planning of green space within cities. However, the spatiotemporal complexities of the intra-city CE-TCP relationship worldwide with distinct climates, as well as the differing impacts of consistently increasing tree cover within urban regions on cooling potential, remain unclear. Here we used satellite-derived MODIS observations to investigate the CE-TCP relationship across 440 global cities during summertime from 2018 to 2020. We further investigated the impacts of enhancing tree cover by a consistent amount in different urban locales on the reduction of population heat exposure among specific age groups. Our results demonstrate a nonlinear CE-TCP relationship globally – CE exhibits an initial sharp decline followed by a gradual reduction as TCP rises, and this nonlinearity is more pronounced in tropical and arid climates than in other climate zones. We observe that 91.4% of cities experience a greater reduction in population heat exposure when introducing the same amount of TCP in areas with fewer trees than in those with denser canopies; and heat exposure mitigation is more prominent for laborers than for vulnerable groups. These insights are critical for developing strategies to minimize urban heat-related health risks.

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全球城市中城市树木冷却效率的分数变化
研究降温效率(CE)与树木覆盖率(TCP)之间的关系对于城市绿地规划至关重要。然而,全球范围内不同气候条件下城市内CE-TCP关系的时空复杂性,以及城市区域内树木覆盖率持续增加对降温潜力的不同影响仍不清楚。在此,我们利用源自卫星的 MODIS 观测数据,研究了 2018 年至 2020 年夏季全球 440 个城市的 CE-TCP 关系。我们进一步研究了在不同城市地区提高一定数量的树木覆盖率对减少特定年龄组人群热暴露的影响。我们的研究结果表明,在全球范围内,CE 与 TCP 之间存在非线性关系--CE 最初急剧下降,随后随着 TCP 的上升而逐渐降低,这种非线性关系在热带和干旱气候中比其他气候区更为明显。我们观察到,如果在树木较少的地区引入相同数量的 TCP,91.4% 的城市会比在树冠较密的地区减少更多的人口热暴露;与弱势群体相比,劳动者的热暴露缓解更为显著。这些见解对于制定最大限度降低城市热相关健康风险的战略至关重要。
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来源期刊
ISPRS Journal of Photogrammetry and Remote Sensing
ISPRS Journal of Photogrammetry and Remote Sensing 工程技术-成像科学与照相技术
CiteScore
21.00
自引率
6.30%
发文量
273
审稿时长
40 days
期刊介绍: The ISPRS Journal of Photogrammetry and Remote Sensing (P&RS) serves as the official journal of the International Society for Photogrammetry and Remote Sensing (ISPRS). It acts as a platform for scientists and professionals worldwide who are involved in various disciplines that utilize photogrammetry, remote sensing, spatial information systems, computer vision, and related fields. The journal aims to facilitate communication and dissemination of advancements in these disciplines, while also acting as a comprehensive source of reference and archive. P&RS endeavors to publish high-quality, peer-reviewed research papers that are preferably original and have not been published before. These papers can cover scientific/research, technological development, or application/practical aspects. Additionally, the journal welcomes papers that are based on presentations from ISPRS meetings, as long as they are considered significant contributions to the aforementioned fields. In particular, P&RS encourages the submission of papers that are of broad scientific interest, showcase innovative applications (especially in emerging fields), have an interdisciplinary focus, discuss topics that have received limited attention in P&RS or related journals, or explore new directions in scientific or professional realms. It is preferred that theoretical papers include practical applications, while papers focusing on systems and applications should include a theoretical background.
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