中原城市群臭氧浓度分布特征及来源

利用2015年臭氧(O_3)自动监测数据和源排放清单,分析了中原城市群O_3浓度的空间、时间分布情况,探讨了中原城市群中城市间O_3的相关性,以及O_3浓度、NOx、VOCs、CO及汽车保有量间的相关性。指出中原城市群是全国更是河南O_3污染的严重地区,O_3浓度年内月度变化呈倒"V"型分布,具有明显的北部城市特征;中原城市群9个城市间除开封外其他8个城市间都呈高度正相关性,相关系数均为0.892~0.991;9个城市机动车保有量及NOx、VOCs和CO等前体物的年排放量与其年均O_3浓度之间存在正相关性。分析认为,NOx、VOCs和CO等前体物的排放是中原城市群O_3浓度偏高的主要影响因素,同时O_3浓度也与日照时间、降雨量、植物源VOCs排放量及相邻城市间污染物的空间输送等因素有着密切的关系。

A Preliminary Study on the Distribution Characteristics and Sources of O3 Concentration in the Central Plains Urban Agglomeration

Based on the O₃ automatic monitoring data and source emission inventory in 2015, the spatial and temporal distribution of O₃ concentration in the Central Plains urban agglomeration was analyzed in this article, and the correlation of O₃ between cities in the Central Plains urban agglomeration was explored, and then the correlation between the concentration of O₃, nitrogen oxides, VOCs, CO and car ownershipwas discussed. It is pointed out that the Central Plains urban agglomeration is one of a heavily infected area of O₃ in China, especially in Henan province. The annual change of O₃ concentration showed an inverted V-shaped distribution, which has the typical characteristics of cities in northern China. The 9 cities of the Central Plains urban agglomeration except Kaifeng had a high positive correlation with each other, and the correlation coefficients were between 0.892-0.991. In addition, there was a positive correlation between the annual emissions of 9 urban motor vehicles ownership and the NO_x, VOCs and CO and their annual O₃ concentrations. Though NO_x, VOCs and CO precursors are the main influencing factors of the high concentration of O₃ in the Central Plains urban agglomeration, it also has a close relationship with sunshine time, rainfall, plant source, VOCs emission and the spatial transport of pollutants between adjacent cities.