中文关键词南京PM_2.5水溶性离子昼夜特征来源解析 英文关键词NanjingPM_2.5water-soluble ionsday-night characteristicssource analysis

作者	单位	E-mail
邱晨晨	南京信息工程大学气象灾害预报预警与评估协同创新中心, 中国气象局气溶胶与云降水重点开放实验室, 南京 210044	chennyqiu@163.com
于兴娜	南京信息工程大学气象灾害预报预警与评估协同创新中心, 中国气象局气溶胶与云降水重点开放实验室, 南京 210044	xnyu@nuist.edu.cn
丁铖	南京信息工程大学气象灾害预报预警与评估协同创新中心, 中国气象局气溶胶与云降水重点开放实验室, 南京 210044
时政	南京信息工程大学气象灾害预报预警与评估协同创新中心, 中国气象局气溶胶与云降水重点开放实验室, 南京 210044
张瑞芳	南京信息工程大学气象灾害预报预警与评估协同创新中心, 中国气象局气溶胶与云降水重点开放实验室, 南京 210044
侯思宇	南京信息工程大学气象灾害预报预警与评估协同创新中心, 中国气象局气溶胶与云降水重点开放实验室, 南京 210044
侯新红	南京信息工程大学气象灾害预报预警与评估协同创新中心, 中国气象局气溶胶与云降水重点开放实验室, 南京 210044

中文摘要 为更好地了解南京江北新区大气气溶胶中水溶性离子的昼夜变化特征，冬季连续采集了2个月的PM_2.5样品，研究其水溶性离子昼夜变化特征及来源解析.结果表明，观测期间水溶性离子质量浓度变化范围为17.07~168.43 μg·m^-3，均值为（59.01±30.75）μg·m^-3，且白天的水溶性离子平均质量浓度高于夜晚.NO₃^-和NH₄⁺的浓度占离子总浓度的比值在夜晚偏高，而SO₄^2-和Cl^-则在白天偏高.SO₄^2-、NO₃^-和NH₄⁺（SNA）是南京市PM_2.5中最重要的水溶性离子，其质量浓度在污染天要高于清洁天.白天和夜晚的阴阳离子平衡比值（AE/CE）大于1，说明PM_2.5呈酸性.相关性分析显示NH₄⁺与NO₃^-、SO₄^2-之间具有显著的线性相关性，其在PM_2.5中主要是以NH₄NO₃和（NH₄）₂SO₄结合方式存在.PMF源解析进一步表明南京江北新区冬季大气PM_2.5中水溶性离子主要来源于机动车排放、化石燃料燃烧、生物质燃烧和扬尘等. 英文摘要 To gain a better understanding of the day-night variation characteristics of water-soluble ions, PM_2.5 samples were continuously collected for two months in the Nanjing Jiangbei New Area during winter. The diurnal variation and sources of water-soluble ions were studied. Results showed that the mass concentration of water-soluble ions ranged from 17.07 μg·m^-3 to 168.43 μg·m^-3 with a mean value of (59.01±30.75) μg·m^-3. The average mass concentration of water-soluble ions in daytime was higher than that in the nighttime. The concentration ratio of NO₃^- and NH₄⁺ to total ion concentrations was higher at night, while SO₄^2- and Cl^- were higher during daytime. SO₄^2-, NO₃^-, and NH₄⁺ (SNA) were the dominant species of water-soluble ions in PM_2.5 in Nanjing. The mass concentration of SNA on polluted days was higher than that on clean days. The ratio of the anion-cation balance (AE/CE) was larger than 1, indicating that the PM_2.5 was acidic. There was a significant linear correlation between NH₄⁺ with NO₃^- and SO₄^2-, indicating that it occurred mainly in the form of NH₄NO₃ and (NH₄)₂SO₄ in PM_2.5. The PMF source apportionment indicated that water-soluble ions of PM_2.5 were mainly derived from motor vehicle emissions, fossil fuel combustion, biomass burning, and dust in the Nanjing Jiangbei New Area.

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