城市密度的下降减轻了人口对地表极端热量暴露的增加
Kangning Huang1,2,3, Brian Stone4, ChengHe Guan5,6
1Shanghai Key Laboratory of Urban Design and Urban Science, NYU Shanghai, Shanghai, China. kh3657@nyu.edu.
Scientific reports
|April 22, 2025
概括
全球城市正在扩大,影响热量暴露. 较密集的城市面临着更大的热风险,而城市绿化可能有助于减轻这种风险. 战略规划是应对气候变化的关键.
科学领域:
- 城市气候学 城市气候学
- 环境科学 环境科学
- 城市规划 城市规划
背景情况:
- 全球城市显示人口密度下降和土地扩张的增加.
- 城市人口暴露在地表城市热岛 (SUHI) 效应下仍未得到充分研究,特别是考虑到城市内部的变化.
- 了解热量暴露趋势对于城市气候弹性至关重要.
研究的目的:
- 从2003年到2020年,分析全球1000个最大城市人口加权SUHI极端的时间趋势.
- 为了研究人口密度变化与热暴露之间的关系.
- 评估植被和表面白度对热暴露的影响.
主要方法:
- 利用1000个全球城市 (2003-2020) 的高分辨率数据.
- 计算出人口加权的SUHI极端值作为空间热暴露的代理值.
- 分析了密度变化,植被,表面白度和热暴露之间的相关性.
主要成果:
- 密度下降的城市在人口加权的SUHI极端值的增长速度较慢,而不是面积平均值.
- 密集的城市在减轻日益高温的风险方面面临更大的挑战.
- 植被变化与暴露于热量有适度的相关性 (R2=0.56),而表面白度显示出可以忽略不计的关系 (R2=0.03).
结论:
- 城市规划必须平衡密集化效益与降低热暴露风险.
- 城市绿化显示出缓解热量的潜力;白色干预需要进一步研究.
- 将热暴露考虑因素纳入城市规划对于气候适应性至关重要.
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