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Ambient single particle analysis in Riverside, California by aerosol time-of-flight mass spectrometry during the SCOS97-NARSTO

Pastor, Sylvia H. and Allen, Jonathan O. and Hughes, Lara S. and Bhave, Prakash V. and Cass, Glen R. and Prather, Kimberly A. (2003) Ambient single particle analysis in Riverside, California by aerosol time-of-flight mass spectrometry during the SCOS97-NARSTO. Atmospheric Environment, 37 (S2). pp. 239-258. ISSN 1352-2310. doi:10.1016/S1352-2310(03)00393-5.

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Single-particle measurements were made using aerosol time-of-flight mass spectrometry (ATOFMS) instruments in conjunction with the 1997 Southern California Ozone Study-North American Research Strategy for Tropospheric Ozone (SCOS97-NARSTO). The size and chemical composition of individual ambient particles in Riverside, CA during the summer of 1997 are described. Data collected using co-located micro-orifice uniform deposit impactors (MOUDI) impactors are used to scale the ATOFMS number counts, providing a unique picture of the particle population which complements information obtained using traditional sizing and composition analysis techniques in this and previous studies. Changes in single particle composition are observed over time, and compared and contrasted with observed changes in visibility, ozone, and PM_(10) concentrations. Details are provided on changes in the particle size and composition observed during three morning periods with low ozone and elevated PM_(10) versus three afternoon periods with both elevated ozone and PM_(10) levels between 21–23 August 1997. The ATOFMS size profiles show afternoon periods dominated by sub-μm particles composed of organic carbon coupled with ammonium nitrate, and morning periods with relatively high levels of super-μm dust particles. The observed changes in particle size and composition are consistent with differences in air mass trajectories arriving at Riverside during the morning and afternoon time periods. Temporal variations in single particle types detected over a 40 day sampling period are presented, demonstrating the type of unique information that can be obtained regarding atmospheric particle processes through long term sampling studies. The broader availability of single particle mass spectrometers coupled with recent advances in the field are now providing unique information on the associations of multiple chemical species (i.e. mixing state) within individual particles with high size and temporal resolution.

Item Type:Article
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URLURL TypeDescription
Allen, Jonathan O.0000-0002-5310-5266
Bhave, Prakash V.0000-0002-2573-951X
Prather, Kimberly A.0000-0003-3048-9890
Additional Information:© 2003 Elsevier Ltd. Received 8 February 2002; accepted 31 March 2003. Available online 30 August 2003. The authors express thanks to the Prather Group members (past and present) who assisted with ATOFMS data acquisition during SCOS97-NARSTO. The authors are grateful to David Fergenson for assistance with Matlab and YAADA. The authors express thanks to the SCAQMD for the ozone and PM_(10) data, thanks to EPRI (Alan Hanson) for the b_(scat) data, and thanks to EPRI and the Harvard School of Public Health (George Allen and Petros Koutrakis) for the daily PM_(2.5) mass data. This research was supported by California Air Resources Board (#96-307) and the US Environmental Protection Agency (STAR Fellowship U-91556601).
Funding AgencyGrant Number
California Air Resources Board96-307
Environmental Protection Agency (EPA)U-91556601
Subject Keywords:Aerosol; Chemistry; On-line; Particulate matter; Neural network
Issue or Number:S2
Record Number:CaltechAUTHORS:20160629-072110352
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Official Citation:Sylvia H. Pastor, Jonathan O. Allen, Lara S. Hughes, Prakash Bhave, Glen R. Cass, Kimberly A. Prather, Ambient single particle analysis in Riverside, California by aerosol time-of-flight mass spectrometry during the SCOS97-NARSTO, Atmospheric Environment, Volume 37, Supplement 2, 2003, Pages 239-258, ISSN 1352-2310,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:68725
Deposited By: Ruth Sustaita
Deposited On:29 Jun 2016 17:36
Last Modified:27 Feb 2023 19:10

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