Structural Characteristics Of Intercity And Intersectoral Embodied CO₂ Transfer Network In Jing-Jin-Ji Region

As the global largest CO₂ emitter,China is under enormous pressure to reduce CO₂ emissions.Jing-Jin-Ji region is one of the regions with the highest CO₂ emissions in China,and it is also the key region for emission reduction.In recent years,trade in Jing-Jin-Ji region is becoming more and more frequent.Intercity and intersectoral embodied CO₂ transfer with trade form the complex embodied CO₂ transfer network.Study on the structural characteristics of intercity and intersectoral embodied CO₂transfer network in Jing-Jin-Ji region is of great significance for reducing emissions in the Jing-Jin-Ji region.Based on the city-level multi-regional input-output table for Jing-Jin-Ji urban agglomeration 2012,this thesis computes the intercity and intersectoral embodied CO₂ transfer in Jing-Jin-Ji region based on multi-regional input-output analysis,and uses complex network analysis to construct intercity and intersectoral embodied CO₂transfer network of Jing-Jin-Ji region.Through complex network indicators,the structural characteristics of intercity and intersectoral embodied CO₂ transfer network in Jing-Jin-Ji region are analyzed.The overall structure characteristics of embodied CO₂ transfer network are studied by the small-world nature and scale-free property.The results show that the intercity and intersectoral embodied CO₂ transfer network in Jing-Jin-Ji region has the small-world nature,indicating that the intercity and intersectoral embodied CO₂transfer in Jing-Jin-Ji region is close.The intersectoral embodied CO₂ transfer network in Jing-Jin-Ji region also has the scale-free property,indicating that a small number of sector nodes have a large amount of embodied CO₂ transfer connections.The group structure characteristics of embodied CO₂ transfer network are studied by the community.The results show that embodied CO₂ transfer within community is close,the intercity embodied CO₂ transfer network in Jing-Jin-Ji region is divided into two communities,one community consists of Beijing,Tianjin,Tangshan and Handan,and the remaining cities form another community.The intersectoral embodied CO₂transfer network in Jing-Jin-Ji region is divided into nine communities.Most of the sectors in the same city or adjacent cities belong to the same community.The community composed of sectors in Beijing and Tianjin has the most embodied CO₂transfer within community.The individual structure characteristics of embodied CO₂ transfer network are studied by identifying key nodes and transfer paths.Identify the key node based on centrality indicators combined with factor analysis method.Identify the key transfer path based on edge weight.The results show that Beijing is the key city node,and the embodied CO₂ transfer between Beijing and Tianjin are the most key transfer paths in the intercity embodied CO₂ transfer network in Jing-Jin-Ji region.Electricity and hot water production and supply in Beijing is the most key sector nodes,and Metallurgy in Tangshan to Metal products in Tangshan is the most key transfer path in the intersectoral embodied CO₂ transfer network in Jing-Jin-Ji region.