Secondary organic aerosol production from pinanediol, a semi-volatile surrogate for first-generation oxidation products of monoterpenes
We have investigated the production of secondary organic aerosol (SOA) from pinanediol (PD), a precursor chosen as a semi-volatile surrogate for first-generation oxidation products of monoterpenes. Observations at the CLOUD facility at CERN have shown that oxidation of organic compounds such as...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2018-05-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://www.atmos-chem-phys.net/18/6171/2018/acp-18-6171-2018.pdf |
| Summary: | We have investigated the production of secondary organic aerosol (SOA) from
pinanediol (PD), a precursor chosen as a semi-volatile surrogate for
first-generation oxidation products of monoterpenes. Observations at the
CLOUD facility at CERN have shown that oxidation of organic compounds such
as PD can be an important contributor to new-particle formation. Here we
focus on SOA mass yields and chemical composition from PD photo-oxidation in
the CMU smog chamber. To determine the SOA mass yields from this
semi-volatile precursor, we had to address partitioning of both the PD and
its oxidation products to the chamber walls. After correcting for these
losses, we found OA loading dependent SOA mass yields from PD oxidation that
ranged between 0.1 and 0.9 for SOA concentrations between 0.02 and 20 µg m<sup>−3</sup>, these mass yields are 2–3 times larger than typical of
much more volatile monoterpenes. The average carbon oxidation state measured
with an aerosol mass spectrometer was around −0.7. We modeled the chamber
data using a dynamical two-dimensional volatility basis set and found that a
significant fraction of the SOA comprises low-volatility organic compounds
that could drive new-particle formation and growth, which is consistent with
the CLOUD observations. |
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| ISSN: | 1680-7316 1680-7324 |