为研究南宁市四季大气颗粒物的化学成分及污染来源,利用单颗粒气溶胶质谱仪(single particle aerosol mass spectrometer,SPAMS)对南宁市2015年四季大气细颗粒物进行观测.SPAMS所测得4个观测阶段大气细颗粒物数浓度与细颗粒物质量浓度...为研究南宁市四季大气颗粒物的化学成分及污染来源,利用单颗粒气溶胶质谱仪(single particle aerosol mass spectrometer,SPAMS)对南宁市2015年四季大气细颗粒物进行观测.SPAMS所测得4个观测阶段大气细颗粒物数浓度与细颗粒物质量浓度线性相关系数均在0.75以上,在一定程度上颗粒物数浓度可反映大气污染状况.南宁市四季大气细颗粒物平均质谱图体现出冬、春两季二次反应生成的污染物质较多.利用自适应共振神经网络分类方法对细颗粒物化学成分进行分类,南宁市细颗粒物各化学成分数浓度占比和污染来源在四季均有差异,且化学成分能体现污染来源.冬季元素碳最高,对应较高的燃煤源;秋季有机碳最高,对应较高的机动车尾气源;夏季富钾颗粒、左旋葡聚糖和矿物质较高,对应较高的生物质燃烧源和扬尘源;春季富钠颗粒和重金属略高.在污染升高过程,生物质燃烧源和燃煤源等贡献较大.展开更多
The impact of air masses motion on marine aerosol properties was investigated using an on-board single particle mass spectrometer(SPAMS) deployed for the determination of single particle size resolved chemical composi...The impact of air masses motion on marine aerosol properties was investigated using an on-board single particle mass spectrometer(SPAMS) deployed for the determination of single particle size resolved chemical composition over Southeast China Sea. Two aerosol blooms(E1 and E2) were observed during the cruise. High average particle number count occurred in E1(7320), followed by E2(5850), which was more than 100–150 times of the average particle number count during normal periods. Particles were classified as four major sources, including continental source, shipping source, marine source, and transport source based on the mass spectral similarity. Transport source was identified as those particles with high particle number count occurred only during aerosol bloom period. Three sub-types of EC-Ca, OC-Ca, and Al-rich were classified as transport source.EC-Ca was the dominant particles of the transport source, accounting for more than 70%of the total particles in aerosol bloom events. A uni-modal size distribution in the size range of 0.1–2.0 μm was observed during normal period, while a bimodal distribution with a tiny mode(<0.3 μm) and a coarse mode between 0.4 and 0.6 μm was present during aerosol bloom. The variation of aerosol source is consistent with air masses back trajectories, for the reason that most of the long-range air trajectories are from the ocean,while short air trajectories originate in the continental regions, which means that air masses have a significant impact on the aerosol physical–chemical properties along their tracks.展开更多
利用潮南区自动监测数据和在线单颗粒气溶胶质谱仪(SPAMS,Single Particle Aerosol Mass Spectrometer)分析潮南区细颗粒物污染特征,追溯潮南区的细颗粒物污染的主要来源。结果表明:潮南区细颗粒物污染多发生在冬春两季,主要是1、2和10...利用潮南区自动监测数据和在线单颗粒气溶胶质谱仪(SPAMS,Single Particle Aerosol Mass Spectrometer)分析潮南区细颗粒物污染特征,追溯潮南区的细颗粒物污染的主要来源。结果表明:潮南区细颗粒物污染多发生在冬春两季,主要是1、2和10月,主要来源于北向和西南向的工业生产源。污染过程主要是由于气象扩散条件不利,燃煤源颗粒富集过多导致,建议在重污染天气时优先考虑加强对该方向燃煤和工业工艺源采取管控措施。展开更多
文摘为研究南宁市四季大气颗粒物的化学成分及污染来源,利用单颗粒气溶胶质谱仪(single particle aerosol mass spectrometer,SPAMS)对南宁市2015年四季大气细颗粒物进行观测.SPAMS所测得4个观测阶段大气细颗粒物数浓度与细颗粒物质量浓度线性相关系数均在0.75以上,在一定程度上颗粒物数浓度可反映大气污染状况.南宁市四季大气细颗粒物平均质谱图体现出冬、春两季二次反应生成的污染物质较多.利用自适应共振神经网络分类方法对细颗粒物化学成分进行分类,南宁市细颗粒物各化学成分数浓度占比和污染来源在四季均有差异,且化学成分能体现污染来源.冬季元素碳最高,对应较高的燃煤源;秋季有机碳最高,对应较高的机动车尾气源;夏季富钾颗粒、左旋葡聚糖和矿物质较高,对应较高的生物质燃烧源和扬尘源;春季富钠颗粒和重金属略高.在污染升高过程,生物质燃烧源和燃煤源等贡献较大.
基金financially supported by the Qingdao National Laboratory for Marine Science and Technology(No.QNLM2016ORP0109)the Natural Science Foundation of Fujian Province,China(No.2015J05024)+1 种基金the National Natural Science Foundation of China(No.21106018,No.41305133)the Scientific Research Foundation of Third Institute of Oceanography,SOA.(No.2014027)
文摘The impact of air masses motion on marine aerosol properties was investigated using an on-board single particle mass spectrometer(SPAMS) deployed for the determination of single particle size resolved chemical composition over Southeast China Sea. Two aerosol blooms(E1 and E2) were observed during the cruise. High average particle number count occurred in E1(7320), followed by E2(5850), which was more than 100–150 times of the average particle number count during normal periods. Particles were classified as four major sources, including continental source, shipping source, marine source, and transport source based on the mass spectral similarity. Transport source was identified as those particles with high particle number count occurred only during aerosol bloom period. Three sub-types of EC-Ca, OC-Ca, and Al-rich were classified as transport source.EC-Ca was the dominant particles of the transport source, accounting for more than 70%of the total particles in aerosol bloom events. A uni-modal size distribution in the size range of 0.1–2.0 μm was observed during normal period, while a bimodal distribution with a tiny mode(<0.3 μm) and a coarse mode between 0.4 and 0.6 μm was present during aerosol bloom. The variation of aerosol source is consistent with air masses back trajectories, for the reason that most of the long-range air trajectories are from the ocean,while short air trajectories originate in the continental regions, which means that air masses have a significant impact on the aerosol physical–chemical properties along their tracks.
文摘利用潮南区自动监测数据和在线单颗粒气溶胶质谱仪(SPAMS,Single Particle Aerosol Mass Spectrometer)分析潮南区细颗粒物污染特征,追溯潮南区的细颗粒物污染的主要来源。结果表明:潮南区细颗粒物污染多发生在冬春两季,主要是1、2和10月,主要来源于北向和西南向的工业生产源。污染过程主要是由于气象扩散条件不利,燃煤源颗粒富集过多导致,建议在重污染天气时优先考虑加强对该方向燃煤和工业工艺源采取管控措施。
