摘要
根据2015年上甸子区域大气本底站PM_(2.5)样品采集数据,分析PM_(2.5)质量浓度及其化学组分变化特征,应用质量闭合、后向轨迹、潜在源等方法分析其来源。结果表明:2015年上甸子站PM_(2.5)质量浓度年平均值为44.9μg·m^(-3),春季、夏季、秋季、冬季均值分别为58.1、30.9、39.7、51.3μg·m^(-3),与2009—2010年相比分别降低了33%、56%、46%、9%。SO_(4)^(2-)、NO-3和NH+4质量浓度年平均值分别为8.5±9.2、6.4±8.3、3.9±4.7μg·m^(-3),有机碳、元素碳浓度年平均值分别为8.9±6.3μg·m^(-3)、1.6±1.2μg·m^(-3)。NO_(3)^(-)与SO_(4)^(2-)浓度日均值的比值为0.82,大于2004年、2012年和2013年的观测结果。PM_(2.5)的主要组分为土壤、有机物、硫酸盐、硝酸盐,占比分别为34%、23%、22%、15%。与2004年相比,上甸子站PM_(2.5)中硫酸盐占比有所下降,土壤组分占比提高。上甸子站PM_(2.5)主要源自站点南部及西北部、北部等,河北省、山东省等地的区域传输对上甸子站高浓度PM_(2.5)存在较大影响。
Based on the PM_(2.5) sample data collected from Shangdianzi regional atmospheric background station in 2015,the variation characteristics of PM_(2.5) mass concentration and its chemical components were analyzed,and its sources were traced by mass closure,backward trajectory,and potential source contribution methods.The results show that the annual average PM_(2.5) mass concentration at Shangdianzi station in 2015 was 44.9μg·m^(-3),with average concentrations of 58.1μg·m^(-3) in spring,30.9μg·m^(-3) in summer,39.7μg·m^(-3) in autumn,and 51.3μg·m^(-3) in winter.Compared with 2009 to 2010,they decreased by 33%,56%,46%,and 9%respectively.The annual average mass concentrations of SO_(4)^(2-),NO_(3)^(-) and NH+4 are 8.5±9.2,6.4±8.3,and 3.9±4.7μg·m^(-3),respectively.The average annual concentrations of organic carbon and elemental carbon are 8.9±6.3μg·m^(-3) and 1.6±1.2μg·m^(-3),respectively.The daily average concentration ratio of NO-3 to SO 2-4 is 0.82,which is higher than the observed results in 2004,2012 and 2013.The main components of PM_(2.5) are soil,organic matter,sulfates,and nitrates,accounting for 34%,23%,22%,and 15%,respectively.Compared with 2004,the proportion of sulfate in PM_(2.5) at Shangdianzi station has decreased,while the proportion of soil components has increased.The PM_(2.5) at Shangdianzi station primarily originates from the southern,northwestern,and northern of the station,and regional transmission from Hebei and Shandong provinces has a great impact on the high concentration of PM_(2.5) in Shangdianzi Station.
作者
贾小芳
李杨
孙晓晴
董璠
JIA Xiaofang;LI Yang;SUN Xiaoqing;DONG Fan(Meteorological Observation Centre,China Meteorological Administration,Beijing 100081,China;Environmental Meteorological Forecast Center of Beijing-Tianjin-Hebei,China Meteorological Administration,Beijing 100089,China)
出处
《气象与环境学报》
2023年第6期87-95,共9页
Journal of Meteorology and Environment
基金
国家自然科学基金面上项目(42175189)资助。
关键词
气溶胶
化学组分
后向轨迹
Aerosol
Chemical composition
Backward trajectory
