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Apportionment of primary and secondary organic aerosols in Southern California during the 2005 Study of Organic Aerosols in Riverside (SOAR-1)

机译:2005年河滨地区有机气溶胶研究(SOAR-1)期间南加州主要和次要有机气溶胶的分配

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摘要

Ambient sampling was conducted in Riverside, California during the 2005 Study of Organic Aerosols in Riverside to characterize the composition and sources of organic aerosol using a variety of state-of-the-art instrumentation and source apportionment techniques. The secondary organic aerosol (SOA) mass is estimated by elemental carbon and carbon monoxide tracer methods, water soluble organic carbon content, chemical mass balance of organic molecular markers, and positive matrix factorization of high-resolution aerosol mass spectrometer data. Estimates obtained from each of these methods indicate that the organic fraction in ambient aerosol is overwhelmingly secondary in nature during a period of several weeks with moderate ozone concentrations and that SOA is the single largest component of PM1 aerosol in Riverside. Average SOA/OA contributions of 70−90% were observed during midday periods, whereas minimum SOA contributions of ~45% were observed during peak morning traffic periods. These results are contrary to previous estimates of SOA throughout the Los Angeles Basin which reported that, other than during severe photochemical smog episodes, SOA was lower than primary OA. Possible reasons for these differences are discussed.
机译:在2005年的Riverside有机气溶胶研究期间,在加利福尼亚的Riverside进行了环境采样,以使用各种最新的仪器和源分配技术来表征有机气溶胶的成分和来源。通过元素碳和一氧化碳示踪剂方法,水溶性有机碳含量,有机分子标记物的化学质量平衡以及高分辨率气溶胶质谱仪数据的正矩阵分解来估算次要有机气溶胶(SOA)的质量。从这些方法中的每种方法获得的估计值表明,在数周的时间内,环境中的气溶胶中的有机成分绝大多数是次生的,且臭氧浓度适中,并且SOA是Riverside中PM1气溶胶的最大成分。在午间时段,平均SOA / OA贡献为70-90%,而在高峰时段,最小SOA / OA贡献为〜45%。这些结果与之前整个洛杉矶盆地SOA的估计相反,后者报告说,除了在严重的光化学烟雾事件期间,SOA低于主要OA。讨论了造成这些差异的可能原因。

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