【摘要】 以襄阳4个国控观测站点2020年3月～2021年2月大气环境质量数据和对应气象数据对襄阳城区秋冬季大气污染特征和气象因素影响进行分析,并利用后向轨迹聚类分析、潜在源贡献因子和浓度权重轨迹方法分析了襄阳城区秋冬季大气污染潜在贡献源区。结果表明:襄阳城区秋冬季大气污染在全年中最为严重,主要污染物以PM_2.5为主,且污染物与温度和风速负相关,与相对湿度和气压呈正相关;污染主要受到近距离和中距离轨迹输送的影响,长距离输送对污染影响较小,污染轨迹大都在中低空高度进行传输;PM_2.5受北方颗粒物输送影响最为显著,主要贡献源区为北方的河北南部、山东西部和河南省,同时,襄阳及周边地区的本地污染贡献也不容忽视。更多还原

【Abstract】 The air pollution characteristics and meteorological factors of Xiangyang in autumn and winter were analyzed using the atmospheric environmental quality data and corresponding meteorological data from four observation sites in Xiangyang from March,2020 to February,2021,the potential contribution source areas of air pollution were calculated using the backward trajectory cluster analysis,potential source contribution factor and concentration weight trajectory method.The results show that the Xiangyang has the most serious air pollution in autumn and winter.The main pollutant is PM_2.5 and the pollutants were negatively correlated with temperature and wind speed,and positively correlated with relative humidity and air pressure.The pollution is mainly affected by the short and meddle distance trajectory transportation,while the long distance transportation has little influence on the pollution,and most of the pollution trajectories are transmitted at medium and low altitude.The main sources of PM_2.5 pollution were southern Hebei,western Shandong and Henan province,while the local pollution contribution of Xiangyang and its surrounding areas could not be ignored.更多还原