基于1km网格的天津市二氧化碳排放研究

CO_2 emissions of Tianjin based on 1 km grid dataset

中国城市建制及地理边界特征使得国际城市CO2排放的关键问题在中国难以深入研究.例如,城市排放占比,城市与周边区域排放差异等.本文基于天津市CO2排放的1km网格,分析天津市CO2排放的空间特征,探讨天津市不同城市范围的CO2排放水平,并与纽约市进行对比分析.结果显示,2007年天津市市域内CO2排放总量为12599万吨,人均排放11.30t.天津市市域CO2排放的空间格局是从中心6个城区向外单位网格排放量逐渐降低.CO2排放在空间上具有显著的正空间自相关性,中心6个城区、滨海新区及郊区县中心镇的CO2排放对其周边区域CO2排放影响显著,天津市狭义城市人均CO2排放量为4.71t,低于纽约市的6.33t;狭义城市范围1排放占总排放的比例为69.26%,略高于纽约市的59.70%.以狭义城市为城市范围时,天津城市及周边区域人均CO2排放的空间特征与发达国家城市的排放特征研究结论一致,都是从城区—郊区—周边区域,人均排放水平逐渐升高;在此范围下,天津城市CO2排放仅占全市域的14.00%.

The administrative and geographical boundary of cities in China make it difficult to conduct in-depth study of the key issues related to CO2 emissions,such as contribution of urban CO2 emissions to the regional or national CO2 emission,the spatial differences of CO2 emission between urban area and its peripheral areas,etc.Based on the 1 km grid dataset developed in this study,the spatial distribution of CO2 emissions in Tianjin was analyzed;the CO2 emission levels of three identified urban boundaries of Tianjin municipality were assessed and compared with New York City.The total CO2 emissions from territories of Tianjin in 2007 were 125.99 Mt,corresponding to 11.30 tons per capita.The CO2 emissions were gradually decreasing from the central six districts outward.There were clear positive spatial autocorrelation in CO2 emissions in Tianjin.The CO2 emissions of six central districts,Binhai New District,and central towns of suburban counties have substantial impact on their surrounding areas.The per capita CO2 emissions of city proper of Tianjin were 4.71 t,lower than that of New York City.The CO2 emissions in SCOPE 1 accounted for 69.26% of the total emission in the city proper,which was higher than 59.70% of New York City.If the city proper was defined as the boundary of Tianjin,the spatial characteristics of the per capita CO2 emissions of Tianjin city were similar to that of cities in developed countries,which showed a gradual increase of per capita CO2 emissions from city proper to suburb and to the whole region.In this condition,the emissions share of Tianjin city was only 14.00% in the total emissions of the jurisdiction of Tianjin municipality.