Atmospheric chemistry
How pollution chemistry builds isoprene SOA in Alabama
Open access · cc by · source: Europe PMC
At Birmingham in SOAS 2013, IEPOX tracers dominate isoprene SOA and correlate with sulfate and ozone, pointing to anthropogenic enhancement of biogenic aerosol.
Study at a glance
- Design
- Other — SOAS 2013 filter campaign quantifying isoprene SOA tracers vs sulfate/ozone
- N
- N=120 · 120 high-volume PM2.5 filters from Birmingham, AL (1 Jun–16 Jul 2013)
- Population
- PM2.5 at Birmingham, Alabama during SOAS 2013
- Outcome
- Isoprene-derived SOA tracer mass and correlations with anthropogenic pollution markers
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Key findings
Isoprene SOA reached ~20% of OM (~7% average). IEPOX tracers were 92.45% of quantified isoprene SOA mass (2-methyltetrols 47%). Tracers correlated with sulfate and daytime ozone; most IEPOX SOA was likely formed upwind in forests, not locally at night.
Methodology
Authors quantified isoprene SOA tracers in 120 high-volume PM2.5 filters from Birmingham during 1 June–16 July 2013 using GC/EI-MS and UPLC/ESI-HR-QTOFMS, then correlated them with SEARCH gases, sulfate, and meteorology.
Limitations
Acidity was not limiting (mean pH 1.8); NOx gases did not correlate with tracers; urban ozone/nitrate cannot explain most of the SOA mass.
How this study connects
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Evidence for the claim as stated.
At Birmingham in SOAS 2013, IEPOX tracers dominate isoprene SOA and correlate with sulfate and ozone, pointing to anthropogenic enhancement of biogenic aerosol.
Evidence for the claim as stated.
A regional ozone study or a mechanism evaluation is not a full global chemical climate model.
Evidence for the claim as stated.
Open questions
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A regional ozone study or a mechanism evaluation is not a full global chemical climate model.
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