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Secondary Organic Aerosol Coating Formation and Evaporation: Chamber Studies Using Black Carbon Seed Aerosol and the Single-Particle Soot Photometer

Metcalf, Andrew R. and Loza, Christine L. and Coggon, Matthew M. and Craven, Jill S. and Jonsson, Haflidi H. and Flagan, Richard C. and Seinfeld, John H. (2013) Secondary Organic Aerosol Coating Formation and Evaporation: Chamber Studies Using Black Carbon Seed Aerosol and the Single-Particle Soot Photometer. Aerosol Science and Technology, 47 (3). pp. 326-347. ISSN 0278-6826. doi:10.1080/02786826.2012.750712. https://resolver.caltech.edu/CaltechAUTHORS:20130802-153334814

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Abstract

We report a protocol for using black carbon (BC) aerosol as the seed for secondary organic aerosol (SOA) formation in an environmental chamber. We employ a single-particle soot photometer (SP2) to probe single-particle SOA coating growth dynamics and find that SOA growth on nonspherical BC aerosol is diffusion-limited. Aerosol composition measurements with an Aerodyne high resolution time-of-flight aerosol mass spectrometer (AMS) confirm that the presence of BC seed does not alter the composition of SOA as compared to self-nucleated SOA or condensed SOA on ammonium sulfate seed. We employ a 3-wavelength photoacoustic soot spectrometer (PASS-3) to measure optical properties of the systems studied, including fullerene soot as the surrogate BC seed, nucleated naphthalene SOA from high-NO_x photooxidation, and nucleated α-pinene SOA from low-NO_x photooxidation. A core-and-shell Mie scattering model of the light absorption enhancement is in good agreement with measured enhancements for both the low- and high-NO_x α-pinene photooxidation systems, reinforcing the assumption of a core-shell morphology for coated BC particles. A discrepancy between measured and modeled absorption enhancement factors in the naphthalene photooxidation system is attributed to the wavelength-dependence of refractive index of the naphthalene SOA. The coating of high-NO_x α-pinene SOA decreases after reaching a peak thickness during irradiation, reflecting a volatility change in the aerosol, as confirmed by the relative magnitudes of f_(43) and f_(44) in the AMS spectra. The protocol described here provides a framework by which future studies of SOA optical properties and single-particle growth dynamics may be explored in environmental chambers.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1080/02786826.2012.750712DOIArticle
http://www.tandfonline.com/doi/abs/10.1080/02786826.2012.750712PublisherArticle
ORCID:
AuthorORCID
Metcalf, Andrew R.0000-0003-0385-1356
Coggon, Matthew M.0000-0002-5763-1925
Jonsson, Haflidi H.0000-0003-3043-1074
Flagan, Richard C.0000-0001-5690-770X
Seinfeld, John H.0000-0003-1344-4068
Additional Information:© 2013 American Association for Aerosol Research. Received: 23 May 2012. Accepted: 21 Oct 2012. Accepted author version posted online: 30 Nov 2012. Published online: 20 Dec 2012. This work was supported by the U.S. Department of Energy grant DE-SC0006626.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0006626
Issue or Number:3
DOI:10.1080/02786826.2012.750712
Record Number:CaltechAUTHORS:20130802-153334814
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130802-153334814
Official Citation:Andrew R. Metcalf , Christine L. Loza , Matthew M. Coggon , Jill S. Craven , Haflidi H. Jonsson , Richard C. Flagan & John H. Seinfeld (2013) Secondary Organic Aerosol Coating Formation and Evaporation: Chamber Studies Using Black Carbon Seed Aerosol and the Single-Particle Soot Photometer, Aerosol Science and Technology, 47:3, 326-347, DOI: 10.1080/02786826.2012.750712
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39748
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:07 Aug 2013 15:02
Last Modified:09 Nov 2021 23:46

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