| Title: | Aqueous Processing of Atmospheric Organic Particles in Cloud Water Collected via Aircraft Sampling |
| Author(s): | Boone EJ; Laskin A; Laskin J; Wirth C; Shepson PB; Stirm BH; Pratt KA; |
| Address: | "daggerDepartment of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States. double daggerEnvironmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, United States. section signPhysical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99354, United States. nablaDepartment of Aviation Technology, Purdue University, West Lafayette, Indiana 47907, United States. oDepartment of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan 48109, United States" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "Cloudwater and below-cloud atmospheric particle samples were collected onboard a research aircraft during the Southern Oxidant and Aerosol Study (SOAS) over a forested region of Alabama in June 2013. The organic molecular composition of the samples was studied to gain insights into the aqueous-phase processing of organic compounds within cloud droplets. High resolution mass spectrometry (HRMS) with nanospray desorption electrospray ionization (nano-DESI) and direct infusion electrospray ionization (ESI) were utilized to compare the organic composition of the particle and cloudwater samples, respectively. Isoprene and monoterpene-derived organosulfates and oligomers were identified in both the particles and cloudwater, showing the significant influence of biogenic volatile organic compound oxidation above the forested region. While the average O:C ratios of the organic compounds were similar between the atmospheric particle and cloudwater samples, the chemical composition of these samples was quite different. Specifically, hydrolysis of organosulfates and formation of nitrogen-containing compounds were observed for the cloudwater when compared to the atmospheric particle samples, demonstrating that cloud processing changes the composition of organic aerosol" |
| Keywords: | Aerosols/*analysis/chemistry Aircraft Alabama Butadienes/chemistry Environmental Monitoring/*methods Hemiterpenes/chemistry Hydrolysis Mass Spectrometry/methods Monoterpenes/chemistry Nitrogen Compounds/analysis/chemistry Particulate Matter/*analysis/chem; |
| Notes: | "MedlineBoone, Eric J Laskin, Alexander Laskin, Julia Wirth, Christopher Shepson, Paul B Stirm, Brian H Pratt, Kerri A eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2015/06/13 Environ Sci Technol. 2015 Jul 21; 49(14):8523-30. doi: 10.1021/acs.est.5b01639. Epub 2015 Jun 26" |
