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“十四运”期间西安PM2.5中水溶性无机离子污染特征
Pollution Characteristics of Water-Soluble Inorganic Ions in PM2.5 in Xi'an During the 14th National Games
投稿时间:2022-04-27  修订日期:2023-05-15
DOI:10.19316/j.issn.1002-6002.2023.05.09
中文关键词:  西安"十四运"  水溶性无机离子  轨迹聚类  潜在源分析
英文关键词:Xi'an 14th National Games  water-soluble ion  trajectory clustering  PSCF
基金项目:国家大气重污染成因与治理攻关项目(DQGG-05-36);陕西省科技厅项目(2021JQ-963,2016SF-454,2019JM-120)
作者单位
曹磊 陕西省环境监测中心站, 陕西省环境介质痕量污染物监测预警重点实验室, 陕西 西安 710054 
陶亚南 陕西省环境监测中心站, 陕西省环境介质痕量污染物监测预警重点实验室, 陕西 西安 710054 
赵蓓 陕西省环境监测中心站, 陕西省环境介质痕量污染物监测预警重点实验室, 陕西 西安 710054 
冯瞧 宝鸡文理学院地理与环境学院, 陕西省灾害监测与机理模拟重点实验室, 陕西 宝鸡 721013 
李永庆 陕西省环境监测中心站, 陕西省环境介质痕量污染物监测预警重点实验室, 陕西 西安 710054 
王雨薇 陕西省环境监测中心站, 陕西省环境介质痕量污染物监测预警重点实验室, 陕西 西安 710054 
周变红* 宝鸡文理学院地理与环境学院, 陕西省灾害监测与机理模拟重点实验室, 陕西 宝鸡 721013 
通讯作者:周变红*  宝鸡文理学院地理与环境学院, 陕西省灾害监测与机理模拟重点实验室, 陕西 宝鸡 721013  
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中文摘要:
      为探究中国第十四届运动会(简称"十四运")期间西安大气PM2.5中水溶性无机离子浓度水平及来源,利用高分辨率MARGA ADI 2080离子在线分析仪对西安"十四运"前、"十四运"期间和"十四运"后水溶性无机离子进行实时观测,分析了不同时段水溶性无机离子组分污染特征、pH变化及污染来源。结果表明,"十四运"前、"十四运"期间和"十四运"后PM2.5质量浓度分别为13.4、11.9、32.6 μg/m3,SNA(NO3-、SO42-和NH4+三者统称)质量浓度分别为5.8、5.4、13.3 μg/m3,占总水溶性无机离子的91.6%~93.6%。"十四运"前和"十四运"期间NO3-与SO42-质量浓度比分别为0.7和0.9,表明移动源的比例增加,主要受交通管控的影响。"十四运"后NO3-与SO42-质量浓度比为2.7,同时NO3-作为最丰富的离子,其质量浓度(7.4 μg/m3)分别为"十四运"前(1.7 μg/m3)和"十四运"期间(1.9 μg/m3)的4.4和3.9倍。观测阶段,大气PM2.5整体呈碱性,进一步通过热力学模型(ISORROPIA-II)计算得出酸性强度为"十四运"前>"十四运"期间>"十四运"后,这与大气富氨环境密切相关。使用主成分-多元线性回归模型(PCA-MLA)分析得到,二次源和扬尘源是观测期间 PM2.5主要的污染来源,"十四运"期间二次源的贡献降到最低。通过轨迹聚类及潜在源(PSCF)分析表明,PM2.5污染主要为短距离污染传输,SNA潜在污染源区主要分布在西安市内以及周边地区。
英文摘要:
      In order to explore the concentration level and source of water-soluble inorganic ions in PM2.5 in Xi'an during the 14th National Games ("the 14th Games"),the MARGA ADI 2080 instrument was used to observe the water-soluble inorganic ions before,during and after the 14th Games.And the pollution characteristics,pH changes and pollution sources of water-soluble inorganic ions in different time periods were analyzed.The results showed that PM2.5 concentrations before,during and after the 14th Games were 13.4,11.9 and 32.6 μg/m3,respectively.The mass concentrations of SNA (NO3-,SO42- and NH4+) were 5.8,5.4 and 13.3 μg/m3,respectively,accounting for 91.6%-93.6% of the total water-soluble inorganic ions.The value of NO3-/SO42- was 0.7 and 0.9 before and during the 14th Games,respectively.It indicated that an increase in the proportion of mobile sources,which was mainly affected by traffic control.After the 14th Games,mass concentration ratio NO3-/SO42- value was 2.7.Meanwhile,NO3- was the most abundant ion,and its mass concentration (7.4 μg/m3) was 4.4 and 3.9 times higher than that before (1.7 μg/m3) and during the 14th Games (1.9 μg/m3),respectively.In the observation stage,PM2.5 was generally alkaline,and the acidity intensity was further calculated by ISORROPIA-Ⅱ model as follows:before > during > after the 14th Games,it was closely related to the atmospheric ammonia rich environment.The results obtained by principal component-multiple linear regression model (PCA-MLA) showed that secondary sources and dust sources were the main pollution sources of PM2.5 during the observation period,and the contribution of secondary sources was the lowest during the 14th Games period.Through trajectory clustering and potential sources (PSCF) analysis,it was found that PM2.5 pollution was mainly transmitted over a short distance,and the potential sources of SNA pollution were mainly distributed in and around Xi'an.
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