Organosulfates as Tracers for Secondary Organic Aerosol (SOA) Formation from 2-Methyl-3-Buten-2-ol (MBO) in the Atmosphere

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• 作者：Haofei Zhang ; David R. Worton ; Michael Lewandowski ; John Ortega ; Caitlin L. Rubitschun ; Jeong-Hoo Park ; Kasper Kristensen ; Pedro Campuzano-Jost ; Douglas A. Day ; Jose L. Jimenez ; Mohammed Jaoui ; John H. Offenberg ; Tadeusz E. Kleindienst ; Jessica Gilman ; William C. Kuster ; Joost de Gouw ; Changhyoun Park ; Gunnar W. Schade ; Amanda A. Frossard ; Lynn Russell ; Lisa Kaser ; Werner Jud ; Armin Hansel ; Luca Cappellin ; Thomas Karl ; Marianne Glasius ; Alex Guenther ; Allen H. Goldstein ; John H. Seinfeld ; Avram Gold ; Richard M. Kamens ; Jason D. Surratt
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2012
• 出版时间：September 4, 2012
• 年：2012
• 卷：46
• 期：17
• 页码：9437-9446
• 全文大小：491K
• 年卷期：v.46,no.17(September 4, 2012)
• ISSN：1520-5851

文摘

2-Methyl-3-buten-2-ol (MBO) is an important biogenic volatile organic compound (BVOC) emitted by pine trees and a potential precursor of atmospheric secondary organic aerosol (SOA) in forested regions. In the present study, hydroxyl radical (OH)-initiated oxidation of MBO was examined in smog chambers under varied initial nitric oxide (NO) and aerosol acidity levels. Results indicate measurable SOA from MBO under low-NO conditions. Moreover, increasing aerosol acidity was found to enhance MBO SOA. Chemical characterization of laboratory-generated MBO SOA reveals that an organosulfate species (C₅H₁₂O₆S, MW 200) formed and was substantially enhanced with elevated aerosol acidity. Ambient fine aerosol (PM_2.5) samples collected from the BEARPEX campaign during 2007 and 2009, as well as from the BEACHON-RoMBAS campaign during 2011, were also analyzed. The MBO-derived organosulfate characterized from laboratory-generated aerosol was observed in PM_2.5 collected from these campaigns, demonstrating that it is a molecular tracer for MBO-initiated SOA in the atmosphere. Furthermore, mass concentrations of the MBO-derived organosulfate are well correlated with MBO mixing ratio, temperature, and acidity in the field campaigns. Importantly, this compound accounted for an average of 0.25% and as high as 1% of the total organic aerosol mass during BEARPEX 2009. An epoxide intermediate generated under low-NO conditions is tentatively proposed to produce MBO SOA.