Volatility and lifetime against OH heterogeneous reaction of ambient isoprene-epoxydiols-derived secondary organic aerosol (IEPOX-SOA)

Hu, Weiwei; Palm, Brett B.; Day, Douglas A.; Campuzano-Jost, Pedro; Krechmer, Jordan E.; Peng, Zhe; de Sá, Suzane S.; Martin, Scot T.; Alexander, M. Lizabeth; Baumann, Karsten; Hacker, Lina; Kiendler-Scharr, Astrid; Koss, Abigail R.; de Gouw, Joost A.; Goldstein, Allen H.; Seco, Roger; Sjostedt, Steven J.; Park, Jeong-Hoo; Guenther, Alex B.; Kim, Saewung; Canonaco, Francesco; Prévôt, André S. H.; Brune, William H.; Jimenez, Jose L.

doi:10.5194/acp-16-11563-2016

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Volatility and lifetime against OH heterogeneous reaction of ambient isoprene-epoxydiols-derived secondary organic aerosol (IEPOX-SOA)

2016
By Hu, Weiwei ; Palm, Brett B. ; Day, Douglas A. ; ...
Source: Atmospheric Chemistry and Physics, 16(18), 11563-11580.

[PDF-1.61 MB]

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Journal Title:

Atmospheric Chemistry and Physics
Personal Author:

Hu, Weiwei ; Palm, Brett B. ; Day, Douglas A. ; Campuzano-Jost, Pedro ; Krechmer, Jordan E. ; ... More +

Hu, Weiwei ; Palm, Brett B. ; Day, Douglas A. ; Campuzano-Jost, Pedro ; Krechmer, Jordan E. ; Peng, Zhe ; de Sá, Suzane S. ; Martin, Scot T. ; Alexander, M. Lizabeth ; Baumann, Karsten ; Hacker, Lina ; Kiendler-Scharr, Astrid ; Koss, Abigail R. ; de Gouw, Joost A. ; Goldstein, Allen H. ; Seco, Roger ; Sjostedt, Steven J. ; Park, Jeong-Hoo ; Guenther, Alex B. ; Kim, Saewung ; Canonaco, Francesco ; Prévôt, André S. H. ; Brune, William H. ; Jimenez, Jose L. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) ; ESRL (Earth System Research Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences)

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) ; ESRL (Earth System Research Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences) Less -
Description:

Isoprene-epoxydiols-derived secondary organic aerosol (IEPOX-SOA) can contribute substantially to organic aerosol (OA) concentrations in forested areas under low NO conditions, hence significantly influencing the regional and global OA budgets, accounting, for example, for 16-36% of the submicron OA in the southeastern United States (SE US) summer. Particle evaporation measurements from a thermodenuder show that the volatility of ambient IEPOX-SOA is lower than that of bulk OA and also much lower than that of known monomer IEPOX-SOA tracer species, indicating that IEPOX-SOA likely exists mostly as oligomers in the aerosol phase. The OH aging process of ambient IEPOXSOA was investigated with an oxidation flow reactor (OFR). New IEPOX-SOA formation in the reactor was negligible, as the OFR does not accelerate processes such as aerosol up-take and reactions that do not scale with OH. Simulation results indicate that adding similar to 100 mu g m(-3) of pure H2SO4 to the ambient air allows IEPOX-SOA to be efficiently formed in the reactor. The heterogeneous reaction rate coefficient of ambient IEPOX-SOA with OH radical (k(OH) /was estimated as 4.0 +/- 2.0 x 10(-13) cm(3) molec(-1) s(-1), which is equivalent to more than a 2-week lifetime. A similar k(OH) was found for measurements of OH oxidation of ambient Amazon forest air in an OFR. At higher OH exposures in the reactor (> 1 x 10(12) molec cm(-3) s), the mass loss of IEPOX-SOA due to heterogeneous reaction was mainly due to revolatilization of fragmented reaction products. We report, for the first time, OH reactive uptake coefficients (gamma(OH) = 0.59 +/- 0.33 in SE US and gamma(OH) = 0.68 +/- 0.38 in Amazon) for SOA under ambient conditions. A relative humidity dependence of k(OH) and gamma(OH) was observed, consistent with surface-area-limited OH uptake. No decrease of k(OH) was observed as OH concentrations increased. These observations of physicochemical properties of IEPOX-SOA can help to constrain OA impact on air quality and climate.
Source:

Atmospheric Chemistry and Physics, 16(18), 11563-11580.
DOI:

https://doi.org/10.5194/acp-16-11563-2016
Document Type:

Journal Article
Funding:

Grant no. NA13OAR4310063
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CC BY
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Submitted
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urn:sha256:0cfeabb34869f940c49010b24e18d1e823c297614e162c2fde8da0c8850f5e69
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https://repository.library.noaa.gov/view/noaa/21630/noaa_21630_DS1.pdf
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Volatility and lifetime against OH heterogeneous reaction of ambient isoprene-epoxydiols-derived secondary organic aerosol (IEPOX-SOA)

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