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Evolution of Atmospheric Particles along Trajectories Crossing the Los Angeles Basin

Hughes, L. S. and Allen, J. O. and Bhave, P. and Kleeman, M. J. and Cass, G. R. and Liu, D.-Y. and Fergenson, D. P. and Morrical, B. D. and Prather, K. A. (2000) Evolution of Atmospheric Particles along Trajectories Crossing the Los Angeles Basin. Environmental Science and Technology, 34 (15). pp. 3058-3068. ISSN 0013-936X. doi:10.1021/es9908671.

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Trajectory analysis shows that the air masses arriving at Riverside, CA, on the afternoons of September 24 and 25, 1996, previously passed near air monitoring sites at Santa Catalina Island, Long Beach, and Fullerton, CA, in succession. At those sites, electrical aerosol analyzers and optical particle counters acquired continuous particle size distribution data, inertial impactor and bulk filter samples were taken with 4-h time resolution for determination of particle size and chemical composition during intensive sampling periods once per day at each site, and aerosol time-of-flight mass spectrometers acquired continuous data on particle size and composition at the single-particle level. These data permit particle evolution to be studied within single air masses as they sequentially pass several monitoring sites over a 2-day period. Air parcels associated with both of the trajectories studied show mineral dust, organic carbon, particulate nitrate and ammonium, and total suspended particulate matter concentrations that increase as transport occurs across the air basin. Large increases in particulate ammonium and nitrate concentrations occur between Fullerton and Riverside due to overnight air stagnation in an area with high gaseous ammonia emissions. The aerosol time-of-flight mass spectrometers show how the externally mixed population of individual particles is modified chemically during transport from Long Beach to Riverside, CA. The coastal aerosol at Long Beach containing sea-salt particles and primary carbon particles is changed substantially as these particles individually accumulate secondary ammonium nitrate and organics during travel across the air basin.

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Additional Information:© 2000 American Chemical Society. Received for review July 28, 1999. Revised manuscript received December 10, 1999. Accepted December 23, 1999. Publication Date (Web): June 29, 2000. The Caltech portion of this work was sponsored by the U.S. Environmental Protection Agency Center on Airborne Organics under Grant R824970-01-0 and by the Center for Air Quality Analysis at Caltech. The UC-Riverside portion of this work was sponsored by California Air Resources Board under Contract 95-305. Thanks to Joe Cassmassi and the staff of the South Coast Air Quality Management District for provid ing meteorological support for these experiments. Aerosol carbon analyses were performed by Bob Cary at Sunset Laboratory, Inc., Forest Grove, OR. INAA analyses were performed by Drs. Ilhan Olmez, Michael Ames, and Jec Gone at the Nuclear Reactor Laboratory, Massachusetts Institute of Technology. We thank J. Richard Williams and Michael Berg at California State University at Long Beach and Robert Gill at California State University at Fullerton for assistance in obtaining use of the measurement sites at Long Beach and Fullerton, respectively.
Funding AgencyGrant Number
Environmental Protection Agency (EPA)R824970-01-0
California Air Resources Board95-305
Caltech Center for Air Quality AnalysisUNSPECIFIED
Issue or Number:15
Record Number:CaltechAUTHORS:20160622-140817462
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Official Citation:Evolution of Atmospheric Particles along Trajectories Crossing the Los Angeles Basin L. S. Hughes, J. O. Allen, P. Bhave, M. J. Kleeman, G. R. Cass, D.-Y. Liu, D. P. Fergenson, B. D. Morrical, and K. A. Prather Environmental Science & Technology 2000 34 (15), 3058-3068 DOI: 10.1021/es9908671
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:68599
Deposited By: Ruth Sustaita
Deposited On:22 Jun 2016 23:58
Last Modified:11 Nov 2021 04:02

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