Evaluation of Secondary Organic Aerosols in Atlanta

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Presentation transcript:

Evaluation of Secondary Organic Aerosols in Atlanta Bo Yan School of Earth and Atmospheric Sciences

Overview Introduction Evaluation method of SOA Results and Discussion Summary

Introduction Composition and sources of organic aerosols in fine particulate matters(PM2.5) Primary Organic Aerosols Come directly from sources as a primary emission. It includes n-alkanes, n-alkanoic acids, Polycyclic Aromatic Hydrocarbons (PAH), fatty acids. Main source: wood burning, meat cooking, fuel combustion, road dust, vegetative detritus. Secondary Organic Aerosols (SOA) Formed in the atmosphere due to the gas or particle phase photochemical reactions. The main precursor of SOA is Volatile Organic Compounds (VOC)

Atmospheric Process and PM2.5

Secondary Organic Aerosols (SOA)

Composition of Organic Aerosols in PM2.5 Source: Zheng et al. 2002

Evaluation Methods of SOA Organic Carbon (OC)/Elemental Carbon (EC) ratio approach Receptor models: Molecular marker-based Chemical Mass Balance (CMB) model Predictive models: Community Multiscale Air Quality modeling system (CMAQ)

Evaluation of SOA in Atlanta using OC/EC ratio (Con’t) Advantages: Simple, straightforward provided that there are available measurements of OC and EC. Disadvantages: (OC/EC)pri is influenced by meteorology, diurnal and seasonal emission and local sources; On the other hand, it is not obtained directly from ambient data.

Evaluation of SOA in Atlanta using OC/EC ratio EC results predominantly from combustion sources and could be used as a tracer of primary OC. Because EC and primary OC often have the same sources and there is a representative ratio of primary OC/EC for a given area. Where, (OC)pri - estimated organic carbon (OC)sec - estimated secondary carbon EC - measured elemental carbon (OC/EC)pri - ratio of primary OC to EC

Evaluation of SOA in Atlanta using OC/EC ratio (Con’t) How to obtain the primary OC/EC? Measure ambient OC/EC ratio at a special time when secondary organic aerosol formation is expected to be very low, which could be neglected (only primary OC exist at this time). The ratio could be gotten in this situation, where lack of sun, intermittent drizzle, low ozone concentration, and an unstable air mass suggest that photochemical activity would be minimum, thus secondary organic aerosol formation would be minimum.

Evaluation of SOA in Atlanta using OC/EC ratio (Con’t) Correlation between measured OC and EC for January 2002 samples in JST Correlation between measured OC and EC for July 2001 samples in JST

Evaluation of SOA in Atlanta using OC/EC ratio (Con’t) Corrected correlation between measured OC and EC for January 2002 samples in JST Corrected correlation between measured OC and EC for July 2001 samples in JST

Evaluation of SOA in Atlanta using OC/EC ratio (Con’t) Winter time represented by January 2002 (OC/EC)pri=2.68 Summer time represented by July 2001 (OC/EC)pri=1.96

Evaluation of SOA in Atlanta using OC/EC ratio (Con’t) Concentration of Total OC and Secondary OC in Winter Time

Evaluation of SOA in Atlanta using OC/EC ratio (Con’t) Concentration of Total OC and Secondary OC in Summer Time

Comparison of the Methods

Summary Secondary Organic Aerosols are a important components of Organic Aerosols in PM2.5 at Atlanta, especially in Summer time. OC/EC Ratio can distinguish the secondary OC from total OC simply and straightforwardly. The method is still greatly influenced by meteorology, diurnal and seasonal emission, and local sources. Hourly data of OC, EC, O3 , and meteorology are needed to provide more insights.

References Ross Strader, et al., Atmospheric Environment 33(1999); Barbara J. Turpin, et al. Environ. Sci. Technol. 25 (1991); Ho-Jin Lim, et al. Environ. Sci. Technol. 36 (2002); Allen Robinson, et al. www.netl.doe.gov/coalpower/environment/ air_q/ .

Thanks!