京津冀及周边地区近地面NO_(2)污染时空特征及来源分析  

Spatial-temporal characteristics and source analysis of near-surface NO_(2)pollution in Beijing-Tianjin-Hebei and surrounding areas

作　　者：张慧敏[1] 刘朋飞[1] ZHANG Huimin;LIU Pengfei(Faculty of Geography,Tianjin Normal University,Tianjin 300387)

机构地区：[1]天津师范大学地理学部,天津300387

出　　处：《环境科学学报》2024年第11期1-15,共15页Acta Scientiae Circumstantiae

基　　金：高分专项天津市智慧城市规划与治理应用产业化示范项目(No.66-Y50G03-9001-22/23)。

摘　　要：随着城市化进程加快和经济快速发展,近年来全国城市普遍受到空气污染的影响,京津冀地区尤为严重.为了深入了解京津冀及周边地区自实施大气污染防治行动计划以来大气污染物NO_(2)的污染状况,基于2013—2022年ChinaHighNO_(2)数据集和地面监测站点数据及其他辅助数据,探究了近10年京津冀及周边地区“2+36”城市的NO_(2)污染时空分布状况及污染来源.首先通过统计分析,从不同时间尺度挖掘NO_(2)污染的分布与变化规律,然后使用HYSPLIT模型计算重污染期的后向轨迹来追溯NO_(2)的传输路径,最后将轨迹聚类、潜在源贡献因子和浓度加权轨迹分析方法相结合,进一步识别影响NO_(2)的潜在源区.结果表明:①京津冀及周边地区近地面NO_(2)浓度空间分布不均,呈现出冀南沿太行山东沿一带以及山东省济南市和淄博市高浓度分布趋势.②各城市NO_(2)浓度均呈逐年下降的显著趋势,高值区域不断减少,冀南沿太行山东沿一带的污染得到明显改善.NO_(2)浓度具有明显的季节性,按照季度均值排序为冬季>秋季>春季>夏季,且夏冬季节差异较大.③京津冀地区污染具有一定的区域性,北京、天津、石家庄、济南4个典型城市秋冬季NO_(2)污染传输路径都受来自西北方向长距离气团的影响,但各个城市的本地排放源及从周边地区传来的近距离轨迹污染输送等过程占主导,且越靠近地面近距离轨迹对污染的贡献越大.本研究可为大气污染治理提供科学依据,更有利于开展区域联防联控和系统整体地解决大气污染问题.With the rapid pace of urbanization and swift economic growth,cities nationwide have experienced a noticeable impact from air pollution in recent years,with the Beijing-Tianjin-Hebei region facing particularly severe conditions.To enhance our comprehension of NO_(2)pollution levels in Beijing-Tianjin-Hebei and neighboring regions following the enforcement of air pollution prevention and control measures,we conducted an analysis using the ChinaHighNO_(2)dataset spanning from 2013 to 2022,along with ground monitoring site data and other auxiliary data.Our study delved into the spatial and temporal distribution of NO_(2)pollution as well as pollution sources of the"2+36"cities within Beijing-Tianjin-Hebei and its surrounding areas over the past decade.Firstly,a statistical analysis was conducted to uncover the pattern of NO_(2)pollution changes pattern in the Beijing-Tianjin-Hebei region from 2013 to 2022 across various time scales.Subsequently,the HYSPLIT model was employed to compute the backward trajectories during periods of severe pollution to track the path of NO_(2)transmission.Lastly,based on trajectory clustering,Potential Source Contribution Factor(PSCF)and Concentration-Weighted Trajectory(CWT)were combined to pinpoint potential source regions that impact NO_(2)levels.The research findings indicate the following:①The spatial distribution of near-surface NO_(2)concentration in the Beijing-Tianjin-Hebei region and its vicinity is uneven,with higher concentrations observed in southern Hebei Province along the eastern edge of Taihang Mountain,as well as in Jinan and Zibo cities in Shandong Province.②There is a consistent year-on-year decrease in NO_(2)levels in each city,particularly areas with initially high concentrations,leading to a notable improvement in air quality in southern Hebei Province along the eastern coast of Taihang Mountain.NO_(2)concentration displays clear seasonality,with winter>autumn>spring>summer in terms of quarterly mean values,highlighting a significant difference between summer

关 键 词：京津冀 NO_(2) 时空分布 后向轨迹聚类 潜在源贡献 浓度权重轨迹 

分 类 号：X51[环境科学与工程—环境工程]