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How pollution chemistry builds isoprene SOA in Alabama
At Birmingham in SOAS 2013, IEPOX tracers dominate isoprene SOA and correlate with sulfate and ozone, pointing to anthropogenic enhancement of biogenic aerosol.
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What campaign and site supplied the filters?
SOAS 2013 at Birmingham, Alabama (BHM).
Source: Assessing the impact of anthropogenic pollution on isoprene-derived secondary organic aerosol formation in PM<sub>2.5</sub> collected from the Birmingham, Alabama, ground site during the 2013 Southern Oxidant and Aerosol Study · DOI · quote verified
How much of OM was isoprene SOA?
Up to ~20%, about 7% on average.
Source: Assessing the impact of anthropogenic pollution on isoprene-derived secondary organic aerosol formation in PM<sub>2.5</sub> collected from the Birmingham, Alabama, ground site during the 2013 Southern Oxidant and Aerosol Study · DOI · quote verified
Which tracer family dominated quantified isoprene SOA?
IEPOX-derived tracers, 92.45%, with 2-methyltetrols 47%.
Source: Assessing the impact of anthropogenic pollution on isoprene-derived secondary organic aerosol formation in PM<sub>2.5</sub> collected from the Birmingham, Alabama, ground site during the 2013 Southern Oxidant and Aerosol Study · DOI · quote verified
How many PM2.5 filters were collected?
120, plus a field blank every 10 days.
Source: Assessing the impact of anthropogenic pollution on isoprene-derived secondary organic aerosol formation in PM<sub>2.5</sub> collected from the Birmingham, Alabama, ground site during the 2013 Southern Oxidant and Aerosol Study · DOI · quote verified
What anthropogenic ion correlates with IEPOX and MAE tracers?
Particulate sulfate.
Source: Assessing the impact of anthropogenic pollution on isoprene-derived secondary organic aerosol formation in PM<sub>2.5</sub> collected from the Birmingham, Alabama, ground site during the 2013 Southern Oxidant and Aerosol Study · DOI · quote verified
What gas correlates with MAE/HMML tracers in daytime?
Ozone (r² = 0.72, n = 30).
Source: Assessing the impact of anthropogenic pollution on isoprene-derived secondary organic aerosol formation in PM<sub>2.5</sub> collected from the Birmingham, Alabama, ground site during the 2013 Southern Oxidant and Aerosol Study · DOI · quote verified
Did gas-phase NOx correlate with the SOA tracers?
No, though nighttime P[NO3] correlated with MAE/HMML tracers.
Source: Assessing the impact of anthropogenic pollution on isoprene-derived secondary organic aerosol formation in PM<sub>2.5</sub> collected from the Birmingham, Alabama, ground site during the 2013 Southern Oxidant and Aerosol Study · DOI · quote verified
Was aerosol acidity the limiting control?
No—mean pH 1.8, and acidity did not correlate with tracers.
Source: Assessing the impact of anthropogenic pollution on isoprene-derived secondary organic aerosol formation in PM<sub>2.5</sub> collected from the Birmingham, Alabama, ground site during the 2013 Southern Oxidant and Aerosol Study · DOI · quote verified
Where was most IEPOX SOA likely formed?
Upwind forested areas, then transported to BHM.
Source: Assessing the impact of anthropogenic pollution on isoprene-derived secondary organic aerosol formation in PM<sub>2.5</sub> collected from the Birmingham, Alabama, ground site during the 2013 Southern Oxidant and Aerosol Study · DOI · quote verified
What global isoprene emission scale is cited?
Around 600 Tg per year, the top non-methane VOC.
Source: Assessing the impact of anthropogenic pollution on isoprene-derived secondary organic aerosol formation in PM<sub>2.5</sub> collected from the Birmingham, Alabama, ground site during the 2013 Southern Oxidant and Aerosol Study · DOI · quote verified
What two instruments quantified the tracers?
GC/EI-MS after trimethylsilylation and UPLC/ESI-HR-QTOFMS.
Source: Assessing the impact of anthropogenic pollution on isoprene-derived secondary organic aerosol formation in PM<sub>2.5</sub> collected from the Birmingham, Alabama, ground site during the 2013 Southern Oxidant and Aerosol Study · DOI · quote verified