Humid Summers Promote Urban Aqueous-Phase Production of Oxygenated Organic Aerosol in the Northeastern United States

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geophysical Research Letters Pub Date : 2025-02-22 DOI:10.1029/2024gl112005

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

Abstract

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 PM_2.5 in urban communities.

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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

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.