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<p>Spatial synergy in urban agglomerations takes a crucial part in enhancing carbon emission efficiency (CEE) in China. However, how cities of different hierarchical levels can achieve spatial synergy in CEE remains poorly understood. Based on a spatial interaction perspective, this paper focuses on the synergy mechanisms of CEE among cities at different hierarchical levels. By constructing a network-based analytical framework and using panel data from Chinese urban agglomerations, this study empirically tests the directional spillover effects and synergy patterns of CEE between cities. The results indicate that cities exhibit significant spatial synergy in CEE, with pronounced hierarchical differences in both the strength and direction of interactions. High-tier cities play a leading role in intercity efficiency linkages, driving CEE transmission down the urban hierarchy toward mid-tier and low-tier cities. Furthermore, geographic proximity, administrative adjacency, organizational proximity, and urban innovation capacity significantly facilitate efficiency interactions, while urban hierarchy constrains the formation of new linkages. This study provides network-based evidence on hierarchical CEE synergy and informs tier-specific regional low-carbon policies.</p>

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Spatial network synergy mechanism of carbon emission efficiency across hierarchical cities: insights from the Yangtze River Delta, China

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Yunpeng Zhang,
  • Yan Sun,
  • Jing Yi

摘要

Spatial synergy in urban agglomerations takes a crucial part in enhancing carbon emission efficiency (CEE) in China. However, how cities of different hierarchical levels can achieve spatial synergy in CEE remains poorly understood. Based on a spatial interaction perspective, this paper focuses on the synergy mechanisms of CEE among cities at different hierarchical levels. By constructing a network-based analytical framework and using panel data from Chinese urban agglomerations, this study empirically tests the directional spillover effects and synergy patterns of CEE between cities. The results indicate that cities exhibit significant spatial synergy in CEE, with pronounced hierarchical differences in both the strength and direction of interactions. High-tier cities play a leading role in intercity efficiency linkages, driving CEE transmission down the urban hierarchy toward mid-tier and low-tier cities. Furthermore, geographic proximity, administrative adjacency, organizational proximity, and urban innovation capacity significantly facilitate efficiency interactions, while urban hierarchy constrains the formation of new linkages. This study provides network-based evidence on hierarchical CEE synergy and informs tier-specific regional low-carbon policies.