Organic Functional Group Composition and Sources of Ambient Aerosol during CalNex 2010 Amanda Frossard, Lynn Russell, Scripps Institution of Oceanography,

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Presentation transcript:

Organic Functional Group Composition and Sources of Ambient Aerosol during CalNex 2010 Amanda Frossard, Lynn Russell, Scripps Institution of Oceanography, UC San Diego Timothy Bates, and Patricia Quinn Pacific Marine Environmental Laboratory, NOAA Photo Credit: P.M. Shaw

Overview Organic Aerosol Collection and Quantification Organic Mass Composition Technique Comparison PMF Source Contributions Single Particle Composition Potential Source Locations Photo Credit: P.M. Shaw

Organic Aerosol Sampling Mass Flow Meter and Controller Total: 16.8 lpm Vacuum Pump PM1 Cyclone 2 pairs of Teflon filters Dried to 55% RH

Organic Aerosol Sampling Four Sampling Regions: Southern California Coastal Transit San Francisco Sacramento

Organic Mass Composition Southern California Coastal Transit San Francisco Sacramento

Overall Organic Mass Composition Ratio of O/C: 0.46 μg m -3 Total OM: 1.64 μg m -3 – Alcohol: 0.26 μg m -3 (16%) – Acid: 0.51 μg m -3 (31%) – Alkane: 0.83 μg m -3 (51%) – Amine: 0.05 μg m -3 (3%) Southern California Coastal Transit San Francisco Sacramento 2.11 μg m μg m μg m μg m -3

Technique Comparison Q-AMS OM = 0.83*FTIR OM r = 0.82 Lower OM in the Q-AMS could be due to organics on dust, submicron sea salt, or other refractory particles

Source Contributions More oxygenated “aged” 76% of OM Less oxygenated “fresh” 12% of OM

Source Contributions Southern California Coastal Transit San Francisco Sacramento

Combustion Factors Less oxygenated More oxygenated Russell et al. 2011, in press

Oxygenated Combustion Factor r = 0.82 Expect that most sulfate is secondary, so correlation with OM suggests the OM is also SOA

Single Particles: Sacramento Combustion Secondary

Single Particles: LA Harbor Combustion Secondary

Source Contributions Organic Mass Carboxylic Acid Concentration

Source Contributions Aged Combustion Fresh Combustion

Summary Average organic mass: 1.64 μg m -3 Two combustion sources – More oxygenated (76% of OM) – Less oxygenated Single Particle analysis – Secondary and combustion particles OM from continental sources

Thanks! Acknowledgements: Scientists and crew of R/V Atlantis The LBNL Beamline group Russell group Dan Czizco and PNNL PMEL and Uva Atlantis Groups