Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 49, Issue 14, Pages 8523-8530Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.5b01639
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Funding
- NSF [AGS-1228496]
- EPA [R835409]
- Office of Biological and Environmental Research of the U.S Department of Energy (DOE)
- DOE by Battelle Memorial Institute [DE-AC06-76RL0 1830]
- University of Michigan College of Literature, Science, and the Arts
- Department of Chemistry
- EPA [673397, R835409] Funding Source: Federal RePORTER
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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 (HEMS) 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 doudwater samples, the chemical composition of these samples was quite different. Specifically, hydrolysis of organosulfates and formation of nitrogen-containing compounds were observed for the doudwater when compared to the atmospheric particle samples, demonstrating that cloud processing changes the composition of organic aerosol.
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