Abstract. Volatile chemical products (VCPs) and other non-combustion-related sources have become important for urban air quality, and bottom-up calculations report emissions of a variety of functionalized compounds that remain understudied and uncertain in emissions estimates. Using a new instrumental configuration, we present online measurements of oxygenated VCPs in a U.S. megacity over a 10-day wintertime sampling period, when biogenic sources and photochemistry were less active. Measurements were conducted at a rooftop observatory in upper Manhattan, New York City, USA using a Vocus chemical ionization time-of-flight mass spectrometer with ammonium (NH₄⁺) as the reagent ion operating at 1 Hz. The range of observations spanned volatile, intermediate-volatility, and semi-volatile organic compounds with targeted analyses of ~150 ions whose likely assignments included a range of functionalized compound classes such as glycols, glycol ethers, acetates, acids, alcohols, acrylates, esters, ethanolamines, and ketones that are found in various consumer, commercial, and industrial products. Their concentrations varied as a function of wind direction with enhancements over the highly-populated areas of the Bronx, Manhattan, and parts of New Jersey, and included abundant concentrations of acetates, acrylates, ethylene glycol, and other commonly-used oxygenated compounds. The results provide top-down constraints on wintertime emissions of these oxygenated/functionalized compounds with ratios to common anthropogenic marker compounds and compares their relative abundances to two regionally-resolved emissions inventories used in urban air quality models.

中文翻译：

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铵加合物化学电离研究城市空气中人为含氧气相有机化合物

摘要。挥发性化学产品 (VCP) 和其他非燃烧相关源已成为城市空气质量的重要组成部分，自下而上的计算报告了各种功能化化合物的排放，这些化合物在排放估算中仍未得到充分研究和不确定。使用新的仪器配置，我们在 10 天的冬季采样期间对美国大城市的含氧 VCP 进行了在线测量，当时生物源和光化学不太活跃。测量是在美国纽约市曼哈顿上城的屋顶天文台使用带有铵 (NH ₄ ⁺) 作为以 1 Hz 运行的试剂离子。观察范围涵盖挥发性、中等挥发性和半挥发性有机化合物，对约 150 种离子进行了针对性分析，这些离子的可能归属包括一系列功能化化合物类别，例如乙二醇、乙二醇醚、乙酸酯、酸、醇、丙烯酸酯、酯、乙醇胺和酮，存在于各种消费品、商业和工业产品中。它们的浓度随风向而变化，在布朗克斯、曼哈顿和新泽西州部分地区的人口稠密地区有所增加，其中包括大量浓度的醋酸盐、丙烯酸盐、乙二醇和其他常用的含氧化合物。