中国三大城市群公路货运碳排放时空特征分析--基于NPP-VIIRS数据的研究

Spatiotemporal characteristics of road freight transport carbon emissions of three urban agglomerations in China--A research based on NPP-VIIRS data

以美国国家极轨运行环境卫星系统预备计划可见光红外成像辐射仪(national polar-orbiting operational environmental satellite system preparatory project—visible infrared imaging radiometer suite,NPP-VIIRS)夜间灯光数据为基础,经过影像重投影、稳定性校正和时间序列校正后,结合统计数据,构建三大城市群公路货运碳排放估算模型。在此基础上,从栅格尺度和市级尺度进行公路货运碳排放时空特征分析。分析结果如下:(1)估算模型的拟合优度分别为0.6762、0.9362和0.5585,估计效果良好,结果有效;(2)2012-2020年三大城市群货运碳排放由1599.25万t增长为1830.31万t,呈现散发增强趋势,京津冀城市群碳排放最高的城市为唐山市,长三角城市群碳排放高的城市为合肥市、上海市、舟山市和苏州市,珠三角城市群碳排放最高的城市为广州市,其次为佛山市、东莞市和深圳市;(3)三大城市群中保定市为碳排放较快增长型,京津冀城市群碳排放重心整体向西北方向移动,长三角和珠三角城市群碳排放重心整体向东北方向移动。

Based on NPP-VIIRS(national polar-orbiting operational environmental satellite system preparatory project—visible infrared imaging radiometer suite)nighttime light dataset,after image reprojection,stability correction,and time series correction,combined with statistical data,the carbon emissions estimation model of road freight transport in three urban agglomerations was constructed.On this basis,the spatiotemporal characteristics of road freight carbon emissions were analyzed from the grid scale and municipal scale.The analysis results were as follows:(1)The fitting goodness of estimation model were 0.6762,0.9362 and 0.5585 respectively,and the estimation effect was good and the results were effective.(2)From 2012 to 2020,the carbon emissions of road freight transport in three urban agglomerations increased from 15.99 Mt to 18.30 Mt,showing a scattered increasing trend.Tangshan was the city with the highest carbon emissions in the Beijing-Tianjin-Hebei urban agglomeration.Hefei,Shanghai,Zhoushan and Suzhou were the cities with high carbon emissions in the Yangtze River Delta urban agglomeration.Guangzhou was the city with the highest carbon emissions in Pearl River Delta urban agglomeration,which was followed by Foshan,Dongguan and Shenzhen.(3)Baoding was the type of rapid growth incarbon emissions in three urban agglomerations.The carbon emissions center of Beijing-Tianjin-Hebei urban agglomeration moved to the northwest as a whole,while the carbon emissions center of the Yangtze River Delta and Pearl River Delta urban agglomeration moved to the northeast as a whole.