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Chemical characterization of secondary organic aerosol at a rural site in the southeastern US: insights from simultaneous high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) and FIGAERO chemical ionization mass spectrometer (CIMS) measurements

Chen, Yunle and Takeuchi, Masayuki and Nah, Theodora and Xu, Lu and Canagaratna, Manjula R. and Stark, Harald and Baumann, Karsten and Canonaco, Francesco and Prévôt, André S. H. and Huey, L. Gregory and Weber, Rodney J. and Ng, Nga L. (2020) Chemical characterization of secondary organic aerosol at a rural site in the southeastern US: insights from simultaneous high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) and FIGAERO chemical ionization mass spectrometer (CIMS) measurements. Atmospheric Chemistry and Physics, 20 (14). pp. 8421-8440. ISSN 1680-7324. https://resolver.caltech.edu/CaltechAUTHORS:20200806-153948183

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Abstract

The formation and evolution of secondary organic aerosol (SOA) were investigated at Yorkville, GA, in late summer (mid-August to mid-October 2016). The organic aerosol (OA) composition was measured using two online mass spectrometry instruments, the high-resolution time-of-flight aerosol mass spectrometer (AMS) and the Filter Inlet for Gases and AEROsols coupled to a high-resolution time-of-flight iodide-adduct chemical ionization mass spectrometer (FIGAERO-CIMS). Through analysis of speciated organics data from FIGAERO-CIMS and factorization analysis of data obtained from both instruments, we observed notable SOA formation from isoprene and monoterpenes during both day and night. Specifically, in addition to isoprene epoxydiol (IEPOX) uptake, we identified isoprene SOA formation from non-IEPOX pathways and isoprene organic nitrate formation via photooxidation in the presence of NO_x and nitrate radical oxidation. Monoterpenes were found to be the most important SOA precursors at night. We observed significant contributions from highly oxidized acid-like compounds to the aged OA factor from FIGAERO-CIMS. Taken together, our results showed that FIGAERO-CIMS measurements are highly complementary to the extensively used AMS factorization analysis, and together they provide more comprehensive insights into OA sources and composition.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.5194/acp-20-8421-2020DOIArticle
https://acp.copernicus.org/articles/20/8421/2020/acp-20-8421-2020-supplement.pdfPublisherSupporting Information
ORCID:
AuthorORCID
Chen, Yunle0000-0001-9904-2638
Nah, Theodora0000-0002-8755-6153
Xu, Lu0000-0002-0021-9876
Stark, Harald0000-0002-0731-1202
Baumann, Karsten0000-0003-4045-5539
Prévôt, André S. H.0000-0002-9243-8194
Huey, L. Gregory0000-0002-0518-7690
Weber, Rodney J.0000-0003-0765-8035
Ng, Nga L.0000-0001-8460-4765
Additional Information:© Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. Received: 13 Feb 2020 – Discussion started: 27 Feb 2020 – Revised: 03 Jun 2020 – Accepted: 17 Jun 2020 – Published: 17 Jul 2020. his work was supported by U.S. Environmental Protection Agency STAR grant R835882. Masayuki Takeuchi and Lu Xu acknowledge support from NSF CAREER AGS-1555034. The FIGAERO HR-ToF-CIMS was purchased through NSF Major Research Instrumentation (MRI) grant 1428738. The authors want to thank Eric S. Edgerton for providing SEARCH network measurements and meteorological data, as well as Qian Zhang, James Rowe, and Linghan Zeng for their help during the campaign. This research has been supported by the U.S. EPA (STAR grant R835882) and the NSF (grant nos. CAREER AGS-1555034 and Major Research Instrumentation (MRI) 1428738). Author contributions. YC, RJW, and NLN designed the research. YC, TN, and KB performed the research. YC and MT processed AMS and FIGAERO-CIMS data. LX, MRC, HS, FC, and ASHP provided insights for source apportionment analysis. YC and NLN analyzed the data and wrote the paper. Data availability. Data are available upon request from the corresponding author (ng@chbe.gatech.edu). The supplement related to this article is available online at: https://doi.org/10.5194/acp-20-8421-2020-supplement. The authors declare that they have no conflict of interest. Review statement. This paper was edited by Stefania Gilardoni and reviewed by two anonymous referees.
Funders:
Funding AgencyGrant Number
Environmental Protection Agency (EPA)R835882
NSFAGS-1555034
NSFAGS-1428738
Issue or Number:14
Record Number:CaltechAUTHORS:20200806-153948183
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200806-153948183
Official Citation:Chen, Y., Takeuchi, M., Nah, T., Xu, L., Canagaratna, M. R., Stark, H., Baumann, K., Canonaco, F., Prévôt, A. S. H., Huey, L. G., Weber, R. J., and Ng, N. L.: Chemical characterization of secondary organic aerosol at a rural site in the southeastern US: insights from simultaneous high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) and FIGAERO chemical ionization mass spectrometer (CIMS) measurements, Atmos. Chem. Phys., 20, 8421–8440, https://doi.org/10.5194/acp-20-8421-2020, 2020.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104788
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:10 Aug 2020 17:06
Last Modified:10 Aug 2020 17:06

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