Evaluation of Secondary Organic Aerosols in Atlanta Bo Yan School of Earth and Atmospheric Sciences.
Characterization of Aerosols at Fire S tation 8, Atlanta, GA
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Transcript of Characterization of Aerosols at Fire S tation 8, Atlanta, GA
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Characterization of Aerosols at Fire Station 8, Atlanta, GA
Matt Kollman
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Location
FS8
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Location
Railyard FS8
“most polluted area in Atlanta”
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Measurements
• Aerosol mass spectra using an Ambient Chemical Speciation Monitor (ACSM) on 30 minute saves
• TEOM for PM2.5 mass concentrations• Black carbon concentrations• Aerosol light scattering data• Met data
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Aerosol composition over time
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Average composition
• Sulfate is a much lower proportion of aerosol than expected
• Total loading over whole period is typical of Atlanta
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Positive Matrix Factorization (PMF)
• Mathematical model that identifies similarities across a dataset and groups into factors
• Does not require a priori information• Useful for source apportionment
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Identification of factors
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Time series for three factor solution
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Discussion
• Organic plumes that contain nitrate peaks at the end all come from the same source
• Constant background of aged aerosol in Atlanta
• Biomass burning signal may be due to prescribed burning outside Atlanta
• Huge plumes in beginning of December equally due to BBOA and HOA
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Correlation with external data
• Ions• Elemental and organic carbon• Wind speed, direction• Rain events