Ambient Measurements of Highly Oxidized Gas-Phase Molecules during the Southern Oxidant and Aerosol Study (SOAS) 2013

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Massoli , P , Stark , H , Canagaratna , M R , Krechmer , J E , Xu , L , Ng , N L , Mauldin , R L , Yan , C , Kimmel , J , Misztal , P K , Jimenez , J L , Jayne , J T & Worsnop , D R 2018 , ' Ambient Measurements of Highly Oxidized Gas-Phase Molecules during the Southern Oxidant and Aerosol Study (SOAS) 2013 ' , ACS Earth and Space Chemistry , vol. 2 , no. 7 , pp. 653-672 . https://doi.org/10.1021/acsearthspacechem.8b00028

Title: Ambient Measurements of Highly Oxidized Gas-Phase Molecules during the Southern Oxidant and Aerosol Study (SOAS) 2013
Author: Massoli, Paola; Stark, Harald; Canagaratna, Manjula R.; Krechmer, Jordan E.; Xu, Lu; Ng, Nga L.; Mauldin, Roy L.; Yan, Chao; Kimmel, Joel; Misztal, Pawel K.; Jimenez, Jose L.; Jayne, John T.; Worsnop, Douglas R.
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Polar and arctic atmospheric research (PANDA)
Date: 2018-07
Language: eng
Number of pages: 39
Belongs to series: ACS Earth and Space Chemistry
ISSN: 2472-3452
URI: http://hdl.handle.net/10138/308513
Abstract: We present measurements of highly oxidized multifunctional molecules (HOMs) detected in the gas phase using a high-resolution time-of flight chemical ionization mass spectrometer with nitrate reagent ion (NO3- CIMS). The measurements took place during the 2013 Southern Oxidant and Aerosol Study (SOAS 2013) at a forest site in Alabama, where emissions were dominated by biogenic volatile organic compounds (BVOCs). Primary BVOC emissions were represented by isoprene mixed with various terpenes, making it a unique sampling location compared to previous NO3- CIMS deployments in monoterpene-dominated environments. During SOAS 2013, the NO3- CIMS detected HOMs with oxygen-to-carbon (O:C) ratios between 0.5 and 1.4 originating from both isoprene (C-5) and monoterpenes (C-10) as well as hundreds of additional HOMs with carbon numbers between C-3 and C-20. We used positive matrix factorization (PMF) to deconvolve the complex data set and extract information about classes of HOMs with similar temporal trends. This analysis revealed three isoprene-dominated and three monoterpene-dominated PMF factors. We observed significant amounts of isoprene- and monoterpene-derived organic nitrates (ONs) in most factors. The abundant presence of ONs was consistent with previous studies that have highlighted the importance of NOx-driven chemistry at the site. One of the isoprene-dominated factors had a strong correlation with SO2 plumes likely advected from nearby coal-fired power plants and was dominated by an isoprene derived ON (C5H10N2O8). These results indicate that anthropogenic emissions played a significant role in the formation of low volatility compounds from BVOC emissions in the region.
Subject: high-resolution mass spectrometry
isoprene chemistry
monoterpene chemistry
biogenic-anthropogenic interactions
ambient measurements
positive matrix factorization
SECONDARY ORGANIC AEROSOL
SOUTHEASTERN UNITED-STATES
POSITIVE MATRIX FACTORIZATION
ISOPRENE-DOMINATED FOREST
MASS-SPECTROMETER
BIOGENIC EMISSIONS
PARTICLE FORMATION
SULFURIC-ACID
MULTIFUNCTIONAL COMPOUNDS
OXIDATION-PRODUCTS
116 Chemical sciences
114 Physical sciences
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