Assessing the impact of anthropogenic pollution on isoprene-derived secondary organic aerosol formation in PM2.5 collected from the Birmingham, Alabama, ground site during the 2013 Southern Oxidant and Aerosol Study

Atmospheric Chemistry and Physics
Weruka RattanavarahaJ D Surratt

Abstract

In the southeastern US, substantial emissions of isoprene from deciduous trees undergo atmospheric oxidation to form secondary organic aerosol (SOA) that contributes to fine particulate matter (PM2.5). Laboratory studies have revealed that anthropogenic pollutants, such as sulfur dioxide (SO2), oxides of nitrogen (NO x ), and aerosol acidity, can enhance SOA formation from the hydroxyl radical (OH)-initiated oxidation of isoprene; however, the mechanisms by which specific pollutants enhance isoprene SOA in ambient PM2.5 remain unclear. As one aspect of an investigation to examine how anthropogenic pollutants influence isoprene-derived SOA formation, high-volume PM2.5 filter samples were collected at the Birmingham, Alabama (BHM), ground site during the 2013 Southern Oxidant and Aerosol Study (SOAS). Sample extracts were analyzed by gas chromatography-electron ionization-mass spectrometry (GC/EI-MS) with prior trimethylsilylation and ultra performance liquid chromatography coupled to electrospray ionization high-resolution quadrupole time-of-flight mass spectrometry (UPLC/ESI-HR-QTOFMS) to identify known isoprene SOA tracers. Tracers quantified using both surrogate and authentic standards were compared with collocated gas- and...Continue Reading

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Jan 1, 2017·Atmospheric Chemistry and Physics·Benjamin N MurphyHavala O T Pye
Dec 20, 2018·Atmospheric Chemistry and Physics·Klara NestorowiczRafal Szmigielski
Mar 5, 2021·Environmental Science & Technology·Clara M Nussbaumer, Ronald C Cohen
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May 27, 2017·Environmental Science & Technology·Yuchen WangJian Zhen Yu
Jan 8, 2021·Environmental Science & Technology·Jacqueline F HamiltonAndrew R Rickard

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Methods Mentioned

BETA
nuclear magnetic resonance

Software Mentioned

ISORROPIA
Model for Ozone and Chemical Tracers ( MOZART )
Flexible dispersion model ( FLEXPART )
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