基于DMSP-OLS与NPP-VIIRS整合数据的京津冀城市群碳排放时空演变特征

Spatio-temporal evolution characteristics of carbon emissions in Beijing-Tianjin-Hebei urban agglomeration derived from integrated data of DMSP-OLS and NPP-VIIRS

为探究京津冀城市群地市级以上城市尺度的碳排放时空演变特征,通过拟合最优模型,将NPP-VIIRS数据转化为DMSP-OLS尺度的夜间灯光数据,得到京津冀城市群2005—2019年的长时间序列夜间灯光数据集;再结合北京、天津、河北能源消费统计碳排放数据,构建京津冀城市群地市级以上城市尺度碳排放估算模型,模拟京津冀城市群碳排放空间分布,并结合倾向值法探究其碳排放时空演变特征。结果表明:京津冀城市群夜间灯光数据与能源消费碳排放量之间的相关性较高,且通过了1%的显著性检验。2005—2019年,京津冀城市群13个城市的碳排放量整体逐渐增加;城市群碳排放增长速度较为缓慢,但京津唐地区增长速度较快;13个城市中已有多个城市单位国内生产总值碳排放量2019年比2005年降幅超40%。研究显示,夜间灯光数据可用于估算京津冀城市群碳排放量,且京津唐地区碳排放量较高,增速较快,应作为重点碳减排地区。

Beijing-Tianjin-Hebei urban agglomeration(BTHUA)was taken as the study area to explore the spatiotemporal evolution characteristics of carbon emissions at the city level and above.By fitting the optimal model,NPP-VIIRS data was transformed into DMSP-OLS scale nighttime light data,and the long-time series nightlight image set of BTHUA from 2005 to 2019 was obtained.Combined with the provincial energy consumption statistical and carbon emission data,a municipal scale carbon emission estimation model at the city level and above in BTHUA was constructed.The spatial distribution of carbon emissions in BTHUA was simulated,and the temporal and spatial evolution characteristics of carbon emissions were explored in combination with the tendency value method.The results showed that:From 2005 to 2019,the correlation between nighttime light data and carbon emissions of energy consumption in BTHUA was high,and the significance test of 1%was passed.From 2005 to 2019,the carbon emissions of 13 cities in BTHUA were basically increasing gradually.Overall,the growth rate of carbon emissions in BTHUA was relatively slow from 2005 to 2019.Among them,Beijing-Tianjin-Tangshan area had a rapid growth rate.In 2019,many of the 13 cities in BTHUA reduced their carbon emissions per unit of GDP by more than 40%compared with that in 2005.The research showed that the nighttime light data could be used to estimate the carbon emissions of BTHUA,and the carbon emissions in Beijing-Tianjin-Tangshan area were high and the growth rate was fast,so it should be regarded as a key carbon emission reduction area.