Secondary Organic Aerosol Formation from Healthy and
Aphid-Stressed Scots Pine Emissions
Posted on 2019-08-27 - 00:03
One barrier to predicting biogenic
secondary organic aerosol (SOA)
formation in a changing climate can be attributed to the complex nature
of plant volatile emissions. Plant volatile emissions are dynamic
over space and time, and change in response to environmental stressors.
This study investigated SOA production from emissions of healthy and
aphid-stressed Scots pine saplings via dark ozonolysis and photooxidation
chemistry. Laboratory experiments using a batch reaction chamber were
used to investigate SOA production from different plant volatile mixtures.
The volatile mixture from healthy plants included monoterpenes, aromatics,
and a small amount of sesquiterpenes. The biggest change in the volatile
mixture for aphid-stressed plants was a large increase (from 1.4 to
7.9 ppb) in sesquiterpenesparticularly acyclic sesquiterpenes,
such as the farnesene isomers. Acyclic sesquiterpenes had different
effects on SOA production depending on the chemical mechanism. Farnesenes
suppressed SOA formation from ozonolysis with a 9.7–14.6% SOA
mass yield from healthy plant emissions and a 6.9–10.4% SOA
mass yield from aphid-stressed plant emissions. Ozonolysis of volatile
mixtures containing more farnesenes promoted fragmentation reactions,
which produced higher volatility oxidation products. In contrast,
plant volatile mixtures containing more farnesenes did not appreciably
change SOA production from photooxidation. SOA mass yields ranged
from 10.8 to 23.2% from healthy plant emissions and 17.8–26.8%
for aphid-stressed plant emissions. This study highlights the potential
importance of acyclic terpene chemistry in a future climate regime
with an increased presence of plant stress volatiles.
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Faiola, Celia L.; Pullinen, Iida; Buchholz, Angela; Khalaj, Farzaneh; Ylisirniö, Arttu; Kari, Eetu; et al. (2019). Secondary Organic Aerosol Formation from Healthy and
Aphid-Stressed Scots Pine Emissions. ACS Publications. Collection. https://doi.org/10.1021/acsearthspacechem.9b00118