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首页> 外文期刊>Environmental Science & Technology >Trends in Secondary Organic Aerosol at a Remote Site in Michigan's Upper Peninsula
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Trends in Secondary Organic Aerosol at a Remote Site in Michigan's Upper Peninsula

机译：密歇根州上半岛偏远地区二次有机气溶胶的发展趋势

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The trends in secondary organic aerosol at a remote location are studied using atmospheric fine particulate matter samples collected at Seney National Wildlife Refuge (NWR) in northern Michigan. Detailed analysis of particle-phase organic compounds revealed very low concentrations of primary anthropogenic emissions and relatively high levels of organic di-, tri-, and tetracarboxylic acids thought to be indicators of secondary organic aerosols. Seasonal changes in these organic compounds were tracked by analyzing composites of monthly average samples. The concentration of aromatic and aliphatic dicarboxylic acids peak in July and taper off in the fall, which coincides with fine particle organic carbon concentration. In contrast, a chemical mass balance model used to quantify primary sources of particulate matter shows higher contributions from primary emissions in the winter. Complementing the monthly average concentrations, event-based composites of high volume samples were used to track the different species of secondary organic aerosol at the Seney NWR location. The distribution of aliphatic diacids and the aromatic di- and triacids varied with different atmospheric conditions, which suggests different precursor gases for these secondary organic aerosol components. The aliphatic diacid concentrations track with ambient concentrations of particle-phase pinonic acid. In addition, back-trajectories for the eight event-based composites are compared to the organic acid distributions and are linked to the distribution of organic acids present in the composites.
机译：使用从密歇根州北部的塞尼国家野生动物保护区（NWR）收集的大气细颗粒物样本研究了偏远地区二次有机气溶胶的趋势。对颗粒相有机化合物的详细分析显示，人为一级排放物的浓度非常低，而有机二，三和四羧酸的水平较高，这些有机酸被认为是次级有机气溶胶的指标。这些有机化合物的季节性变化可通过分析每月平均样本的组合来跟踪。芳香族和脂肪族二羧酸的浓度在7月达到峰值，然后在秋季逐渐减小，这与微粒有机碳的浓度相吻合。相反，用于量化颗粒物主要来源的化学物质平衡模型显示，冬季主要排放物的贡献更大。为了补充月平均浓度，使用了基于事件的高容量复合样品来追踪Seney NWR位置的不同种类的二次有机气溶胶。脂族二酸和芳族二酸和三酸的分布随不同的大气条件而变化，这表明这些次级有机气溶胶组分的前驱体气体不同。脂族二酸的浓度随颗粒相松酸的环境浓度而变化。此外，将八个基于事件的复合材料的后向轨迹与有机酸分布进行了比较，并与复合物中存在的有机酸的分布相关。

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