探索城市规模对碳排放的影响:来自中国259个县级城市的证据
Yanan Wang1, Jiaxin Liu1, Juan Wang2,3
1College of Economics and Management, Northwest A&F University, Yangling, Xianyang, 712100, China.
概括
中国中国中国中国.
科学领域:
- 城市研究是城市研究.
- 环境科学环境科学
- 地理信息系统 (GIS) 是一个地理信息系统.
背景情况:
- 城市是能源消耗和二氧化碳 (CO2) 排放的主要中心.
- 准确测量城市规模及其对不同城市层次的二氧化碳排放的影响仍在争论中.
- 现有的方法通常依赖于人口或空间面积等单一指标,限制了全面的分析.
研究的目的:
- 利用夜间照明数据开发一个更强大的城市大小指数.
- 分析这个城市规模指数对中国人均城市碳排放的影响.
- 调查不同人口和经济发展水平的城市间的异质效应.
主要方法:
- 利用全球夜间灯光数据来识别城市明亮和建筑区域.
- 构建了中国259个县级城市 (2003-2019) 的综合城市规模指数.
- 采用动态面板模型来评估城市规模与人均碳排放之间的关系.
主要成果:
- 中国城市规模指数呈现波动性增长,大多数城市呈现中高值.
- 在经济和人口层面上观察到城市规模的显著梯度差异,但所有趋势都是上升的.
- 超级城市 (>500万人口) 的扩张大大增加了碳排放量;一线城市的扩张排放量增长最大,而下层城市的排放量增长最小.
结论:
- 通过使用夜间光线数据,建立了一个新的多维城市大小指数.
- 城市扩张对碳排放产生重大影响,其强度因城市层次和规模而异.
- 研究结果支持针对不同规模和发展水平的城市量身定制的减排战略.
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