2000~2020年京津冀BVOCs排放量估算及时空分布特征

为研究京津冀地区天然源挥发性有机化合物(BVOCs)近20a排放量及时空分布特征,本文基于卫星遥感解译获得的2000年、2005年、2010年、2015年、2020年共5期中国土地利用数据,计算获得了京津冀地区各市县BVOCs排放量及排放组成,同时对京津冀地区近20a的BVOCs排放的时空分布进行了特征分析.结果表明,近20a京津冀地区BVOCs平均排放总量为76.40万t/a,其中河北省、北京市、天津市的平均排放总量分别为59.11万t/a,15.29万t/a,2.00万t/a;按照排放组成分析,ISOP平均排放总量为16.80万t/a,占总排放量的21.99%,TMT平均排放总量为29.62万t/a,占总排放量的38.77%,OVOCs平均排放总量为29.97万t/a,占总排放量的39.23%.根据排放时间特征分析,京津冀地区冬季BVOCs排放量最低、夏季BVOCs排放量最高.BVOCs排放的空间分布与土地利用类型和植被分布密切相关,不同土地利用类型的BVOCs排放贡献具有显著差异,近20a京津冀地区林地、耕地、草地的BVOCs平均排放量分别为60.33万t/a,12.78万t/a,2.31万t/a,分别占总排放量的78.90%,16.79%,3.04%.京津冀地区BVOCs空间排放分布差异比较明显,北部、东北部的整体排放量明显高于南部、东南部.本研究可为BVOCs的计算提供研究思路,同时可为京津冀地区空气污染治理提供有关基础数据.

Estimation of BVOCs emissions from Beijing,Tianjin and Hebei from 2000 to 2020 and its temporal and spatial distribution characteristics

In order to study the emission and temporal and spatial distribution characteristics of volatile organic compounds (BVOCs) from natural sources in Beijing, Tianjin and Hebei regions in recent 20 years, based on five periods of China's land use data obtained from satellite remote sensing interpretation in 2000, 2005, 2010, 2015 and 2020, this paper calculates and obtains the emission and emission composition of BVOCs from cities and counties in Beijing, Tianjin and Hebei, At the same time, the temporal and spatial distribution of BVOCs emission in Beijing Tianjin Hebei region in recent 20 years is analyzed The results show that the average total emission of BVOCs in Beijing Tianjin Hebei region in recent 20 years is 764000 T/A, of which the average total emission of Hebei Province, Beijing and Tianjin are 591100T/A, 152900T/A and 20000t/a respectively; According to the analysis of emission composition, the average total emission of ISOP is 168000T/A, accounting for 21.99% of the total emission, the average total emission of TMT is 296200T/A, accounting for 38.77% of the total emission, and the average total emission of OVOCs is 299700T/ A, accounting for 39.23% of the total emission According to the analysis of emission time characteristics, the BVOCs emission in Beijing Tianjin Hebei region is the lowest in winter and the highest in summer The spatial distribution of BVOCs emissions is closely related to land use types and vegetation distribution. There are significant differences in the contribution of BVOCs emissions from different land use types. The average BVOCs emissions from forest land, cultivated land and grassland in Beijing Tianjin Hebei region in recent 20 years are 603300T/A, 127800T/A and 23100T/a respectively, accounting for 78.90%, 16.79% and 3.04% of the total emissions respectively The spatial emission distribution of BVOCs in Beijing Tianjin Hebei region is obviously different, and the overall emission in the north and northeast is significantly higher than that in the South and Southeast This study can provide research ideas for the calculation of BVOCs, and provide relevant basic data for air pollution control in Beijing, Tianjin and Hebei.