Mitchell J. Rogers, Taekyu Joo, Tori Hass-Mitchell, Manjula R. Canagaratna, Pedro Campuzano-Jost, Donna Sueper, Mia N. Tran, Jo E. Machesky, Joseph R. Roscioli, Jose L. Jimenez, Jordan E. Krechmer, Andrew T. Lambe, Benjamin A. Nault, Drew R. Gentner
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引用次数: 0
摘要
水相吸收和处理水溶性有机化合物可促进二次有机气溶胶（SOA）的产生。我们在纽约市的两个地点评估了水相化学对夏季城市 SOA 的贡献。水相处理的相对作用随化学和环境条件的变化而变化，在相对湿度（RH）超过 65% 和温度较高的时段，白天 SOA 明显增加（如 1 μg/m3）。含氧有机气溶胶（OOA）的产生对次级无机气溶胶也很敏感，部分原因是次级无机气溶胶对气溶胶液态水的影响。平均而言，在纽约皇后区，高相对湿度时期氧化程度较低的有机气溶胶生成量增加了 69%。这些增加与偏南的后向轨迹和更高的无机气溶胶浓度相吻合，但皇后区和曼哈顿之间的城市内差异很大。即使在硫酸盐和硝酸盐气溶胶负荷处于历史低位的情况下，观测到的水相 SOA 产生量也凸显了在城市社区持续降低夏季 PM2.5 的机遇和挑战。
Humid Summers Promote Urban Aqueous-Phase Production of Oxygenated Organic Aerosol in the Northeastern United States
Aqueous-phase uptake and processing of water-soluble organic compounds can promote secondary organic aerosol (SOA) production. We evaluated the contributions of aqueous-phase chemistry to summertime urban SOA at two sites in New York City. The relative role of aqueous-phase processing varied with chemical and environmental conditions, with evident daytime SOA enhancements (e.g., >1 μg/m3) during periods with relative humidities (RH) exceeding 65% and often higher temperatures. Oxygenated organic aerosol (OOA) production was also sensitive to secondary inorganic aerosols, in part through their influence on aerosol liquid water. On average, high-RH periods exhibited a 69% increase in less-oxidized OOA production in Queens, NY. These enhancements coincided with southerly backward trajectories and greater inorganic aerosol concentrations, yet showed substantial intra-city variability between Queens and Manhattan. The observed aqueous-phase SOA production, even with historically low sulfate and nitrate aerosol loadings, highlights both opportunities and challenges for continued reductions in summertime PM2.5 in urban communities.
期刊介绍：
Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.
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