摘要
该研究于2017年9月-2018年2月连续采集长沙市大气PM_(2.5)样品,分析了PM_(2.5)样品中水溶性有机碳(WSOC)的浓度变化及其与大气污染物的相关性,对比分析了清洁天和污染天WSOC浓度特征,并基于后向轨迹分析(HYSPLIT)和潜在源贡献因子分析(PSCF)方法探讨了秋冬季WSOC的传输路径及潜在来源贡献。结果表明,秋、冬季WSOC平均浓度分别为6.22、7.00μg/m^(3),WSOC与相对湿度和风速均呈显著负相关,与温度相关性不明显。WSOC与PM_(2.5)具有显著的相关性(R=0.800),秋季WSOC与CO、O_(3)、NO_(2)、SO_(2)的相关性比冬季更加显著。污染天风速小、相对湿度低,WSOC污染浓度明显高于清洁天。HYSPLIT和PSCF分析结果表明,除本地排放外,WSOC还受来自偏北及偏东方向区域污染源传输的影响。
From September 2017 to February 2018,samples of atmospheric PM_(2.5)were continuously collected in Changsha.The changes of water-soluble organic carbon(WSOC)concentration in PM_(2.5)samples and their correlation with atmospheric pollutants were analyzed,and the WSOC concentrations characteristics on clean days and polluted days were compared and analyzed.The air mass trajectory and potential source contribution of WSOC in autumn and winter were discussed by back⁃ward trajectory analysis(HYSPLIT)and potential source contribution function(PSCF).The results showed that the average concentration of WSOC in autumn and winter were 6.22μg/m^(3) and 7.00μg/m^(3),respectively.WSOC was significantly nega⁃tively correlated with relative humidity and wind speed,but not significantly correlated with temperature.There was a signifi⁃cant correlation between WSOC and PM_(2.5)(R=0.800).WSOC and CO,O_(3),NO_(2),and SO_(2) were more significant in autumn than in winter.During the polluted day,low wind speed and low relative humidity led to higher WSOC concentrations in polluted days than clean day.HYSPLIT and PSCF analysis results show that WSOC is affected by pollution sources from urban areas to the north and east in addition to local emissions.
作者
王芳
方小珍
谢亚军
梁越
刘诚
肖红伟
WANG Fang;FANG Xiaozhen;XIE Yajun;LIANG Yue;LIU Cheng;XIAO Hongwei(Jiangxi Key Laboratory of Air Pollution Cause and Control,East China University of Technology,Nanchang 330013,China;School of Water Resources and Environmental Engineering,East China University of Technology,Nanchang 330013,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2021年第3期46-52,共7页
Environmental Science & Technology
基金
江西省自然科学基金项目(20202BAB213019)。
关键词
PM_(2.5)
水溶性有机碳
后向轨迹
潜在源贡献
PM_(2.5)
water soluble organic carbon
backward trajectory
potential source contribution
