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Abstract
Abstract. The formation and evolution of secondary organic aerosol (SOA) were investigated at Yorkville, GA, in late summer (mid-August to mid-October 2016). The organic aerosol (OA) composition was measured using two online mass spectrometry instruments, the high-resolution time-of-flight aerosol mass spectrometer (AMS) and the Filter Inlet for Gases and AEROsols coupled to a high-resolution time-of-flight iodide-adduct chemical ionization mass spectrometer (FIGAERO-CIMS). Through analysis of speciated organics data from FIGAERO-CIMS and factorization analysis of data obtained from both instruments, we observed notable SOA formation from isoprene and monoterpenes during both day and night. Specifically, in addition to isoprene epoxydiol (IEPOX) uptake, we identified isoprene SOA formation from non-IEPOX pathways and isoprene organic nitrate formation via photooxidation in the presence of NOx and nitrate radical oxidation. Monoterpenes were found to be the most important SOA precursors at night. We observed significant contributions from highly oxidized acid-like compounds to the aged OA factor from FIGAERO-CIMS. Taken together, our results showed that FIGAERO-CIMS measurements are highly complementary to the extensively used AMS factorization analysis, and together they provide more comprehensive insights into OA sources and composition.
Highlights
Organic aerosol (OA), known for its complexity, represents a substantial fraction of tropospheric submicron aerosol (Kanakidou et al, 2005; Zhang et al, 2007; Kroll and Seinfeld, 2008; Jimenez et al, 2009)
Monoterpene nocturnal reactions have been shown to be an important source of particulate organic nitrates in the southeastern United States (US) (Xu et al, 2015a, b; Pye et al, 2015), while more recent studies have demonstrated that monoterpenes are the prominent source of total organic aerosol (OA) in the southeastern US given the large fraction of non-nitrogen-containing monoterpenederived species (Zhang et al, 2018; Xu et al, 2018)
aerosol mass spectrometer (AMS) and FIGAERO-CIMS measurements were combined to provide a better understanding of OA sources, composition, and properties
Summary
Organic aerosol (OA), known for its complexity, represents a substantial fraction of tropospheric submicron aerosol (Kanakidou et al, 2005; Zhang et al, 2007; Kroll and Seinfeld, 2008; Jimenez et al, 2009). The southeastern United States (US) is known for its large biogenic volatile organic compound (VOC) emissions from both conifer and deciduous forests under the influence of intensive anthropogenic activities (Weber et al, 2007; Xu et al, 2015a). For isoprene-derived SOA, isoprene epoxydiol (IEPOX) uptake, followed by subsequent condensed-phase reactions (Surratt et al, 2010; Lin et al, 2012; Paulot et al, 2009), is known to be the major pathway in the southeastern US, approximately contributing 18 %–36 % to total OA in warm seasons (Budisulistiorini et al, 2013; Hu et al, 2015; Xu et al, 2015a, b). Monoterpene nocturnal reactions have been shown to be an important source of particulate organic nitrates in the southeastern US (Xu et al, 2015a, b; Pye et al, 2015), while more recent studies have demonstrated that monoterpenes are the prominent source of total OA in the southeastern US given the large fraction of non-nitrogen-containing monoterpenederived species (Zhang et al, 2018; Xu et al, 2018)
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