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Aerosol Composition and Size Measurements at Fresno and Fontana

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Aerosol Composition and Size Measurements at Fresno and Fontana

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Date Issued
  • 2017
Date Collected
  • 19 Dec 2014 to 13 Jan 2015 (Fresno); 04 to 28 July 2015 (Fontana)
Cite This Work

Russell, Lynn M; Betha, Raghu; Sanchez, Kevin J; Liu, Jun; Price, Derek J; Chen, Chia-Li; Lee, Alex (2017): Aerosol Composition and Size Measurements at Fresno and Fontana. UC San Diego Library Digital Collections. https://doi.org/10.6075/J0VX0DF9

Description

Comprehensive aerosol measurements were carried out during winter (19 December 2014 to 13 January 2015) in Fresno (San Joaquin Valley) and summer (4 to 28 July 2015) in Fontana (Southern California Air Basin). The sampling site in Fresno, managed by University of California Davis, was located behind the UC extension building at 550 Shaw Ave. (36.810 N, 119.780 W). Residential buildings to the north, commercial complexes to the south, and the Yosemite Freeway to the west of sampling location allowed repeated daily measurements of both the residential wood burning and traffic emissions in Fresno. The sampling site in Fontana, managed by South Coast Air Quality Management District, was located behind the fire station at 14360 Arrow Highway (34.100 N, 117.490 W). Surrounded by the I-15 freeway to the west, I-10 freeway to the east, and an auto speedway to the south, the sampling location was primarily influenced by vehicular emissions.

An isokinetic inlet with a motorized horizontal shroud mounted on the sampling van was used to sample the ambient air. Air pulled through the inlet was distributed through a sampling plenum to the particle instruments housed in the van. Size distributions of sub-micrometer particles (0.01 - 1 μm) were measured with a Scanning Electrical Mobility Spectrometer (SEMS, Model 138 2002, Brechtel Manufacturing Inc., Hayward CA). The Single Particle Soot Photometer (SP2, Model SP2-C, DMT, Boulder CO) was used to measure refractory Black Carbon (rBC, or soot) mass and number concentrations, as well as size distributions in the 0.07 to 0.4 μm range. rBC and non-refractory coating materials (including organic, sulfate, nitrate, ammonium and chloride) on rBC were also measured by Aerodyne Soot-particle Aerosol Mass Spectrometer (SP-AMS) in Fontana. All the instruments were calibrated before and after each study. Flow sensors of SEMS were calibrated using a Gillibrator (Sensidyne, LP) to ensure the reliability of number concentrations and size distributions. Nebulized and size-selected aqueous suspension of fullerene soot (Alfa Aeser, Tewksbury MA) was used to calibrate the broadband and narrowband incandescence detectors to accurately measure rBC mass. Non-refractory aerosol mass and chemical composition were measured by High Resolution Time of Flight Aerosol Mass spectrometer (Model: HR-ToF-AMS with ET, Aerodyne, Billerica MA). The AMS was operated under a 5 min mode-switching cycle (V-mode, 2-min; LS-mode (UMR), 2-min; W-mode, 1-min), synchronized with the switching of a thermal denuder between a bypass mode and a denuded mode. Single-particle chemical composition was measured for 1 min of every 5 min using a light-scattering (LS) module coupled with the time-of-flight aerosol mass spectrometer. The chemical characterization of the single-particle measurements was carried out using the Clustering Analysis Panel (CAP). In addition filter samples were collected on pre-scanned Teflon filters (Teflon, Pall Inc., 37mm diameter, 1.0 µm pore size) at Fresno and Fontana behind PM1 and PM2.5 sharp-cut cyclones (SCC2.229 PM1 and SCC2.229 PM2.5, BGI Inc.), and a PM0.18 Berner type impactor [Russell et al., 2009]. Samples were then frozen and transported to the laboratory for FTIR spectroscopy analysis by a Tensor 27 spectrometer (Bruker Optics). All samples were kept in a relative humidity (35-45%) and temperature (20°C) controlled room for at least 24 hours prior to the analysis. Organic functional groups (carbonyl, amine, alcohol, alkane and carboxylic acid groups) were measured directly on all sampled filters by FTIR. Duplicate Teflon filters placed in-line behind 20% of the sampled filters were used as a measure of sample contamination or artifacts and contained negligible organic mass. An automated algorithm including baselining, peak fitting, and integration was used to interpret the FTIR spectrum from each filter [Russell et al. 2009]. The FTIR spectra are background subtracted and normalized to air volume to calculate mass concentration of each functional group, as well as organic mass and organic carbon concentrations.

Russell, L. M., S. Takahama, S. Liu, L. N. Hawkins, D. S. Covert, P. K. Quinn, and T. S. Bates (2009), Oxygenated fraction and mass of organic aerosol from direct emission and atmospheric processing measured on the R/V Ronald Brown during TEXAQS/GoMACCS 2006, J. Geophys. Res. Atmos., 114(7), 1–15, http://doi.org/10.1029/2008JD011275.

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1 digital object.

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Related Publications

Chia-Li Chen, Sijie Chen, Lynn M. Russell, Jun Liu, Derek J. Price, Raghu Betha, Kevin J. Sanchez, Alex K. Y. Lee, Xiaolu Zhang and Christopher D. Cappa (2017). Source-Related Differences in Organic Aerosol Composition in the Wintertime San Joaquin Valley (Fresno) and the Summertime South Coast Air Basin (Fontana) of California. Journal of Geophysical Research. Submitted

Raghu Betha, Lynn M. Russell, Chia-Li Chen, Jun Liu, Derek J. Price, Kevin J. Sanchez, Sijie Chen, Alex K. Y. Lee, Xiaolu Zhang, and Christopher D. Cappa (2017). Size of atmospheric aerosol and coatings on black carbon containing particles are larger for residential burning (in wintertime San Joaquin Valley) than for vehicle combustion (in summertime South Coast Air Basin). Journal of Geophysical Research. Submitted

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Funding

California Air Resources Board (Agreement No: 13-330)