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Semi-Continuous Aerosol Carbon Measurements: Comparison of Atlanta Supersite Measurements

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Abstract: An intensive field campaign of the Atlanta Supersite Experiment was carried out at a ground-based measurement site on Jefferson Street in midtown Atlanta, GA, from 3 August to 1 September, 1999. This paper examines the semi-continuous particulate organic and elemental measurements that were made as a part of the experiment. Measurements were made using a Rutgers University/Oregon Graduate Institute in situ thermal-optical carbon analyzer, Rupprecht and Patashnick 5400 ambient carbon particulate monitor, Radiance Research particle soot absorption photometer, Aerosol Dynamics flash vaporization carbon analyzer, and Magee Scientific AE-16 aethalometer. The "intersampler precision" with which semi-continuous particulate TC, OC, and EC were measured is 7, 13 and 26%, expressed as pooled coefficients of variation of 2, 3, and 4 instruments, respectively. Correlations between pairs of OC measurements are moderate (R2 = 54-73%) and correlations between pairs of EC measurements are high (R2= 74-97%). Differences in reported OC concentrations are small compared to differences in EC concentrations; intersampler EC concentration differences result from differences 1) in the operational definitions of OC and EC, 2) in the calibration of optical instruments, and 3) because EC values are closer to limits of detection. This agreement between semi-continuous samplers is quite good, especially in light of previous particulate carbon comparisons. Reasons for measurement differences and benefits of automated, time-resolved measurements are discussed.

This publication was funded in part by the Electric Power Research Institute. The United States Environmental Protection Agency through its Office of Research and Development partially funded and collaborated in the research described here under assistance agreement number CR824849 to Georgia Institute of Technology. It has been subject to Agency review and approved for publication.
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Citation:Lim, H. J., B. Turpin, E. Edgerton, S. Hering, G. Allen, H. Maring, and P. A. Solomon. Semi-Continuous Aerosol Carbon Measurements: Comparison of Atlanta Supersite Measurements. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 108(D7):SOS7-1 to SOS7-12, (2003).
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Contact: Liz Hope - (919) 541-2785 or hope.elizabeth@epa.gov
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Division: Human Exposure & Atmospheric Sciences Division
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Branch: Human Expsoure Research Branch
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Product Type: Journal
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Published: 01/21/2003
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Bullet Item Semi-Continuous Aerosol Carbon Measurements: Comparison of Atlanta Supersite Measurements
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Bullet Item Heasd PM Research Methods: Particle Methods Evaluation and Development
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