Organic Functional Group Composition and Sources of Ambient Aerosol during CalNex 2010 Amanda...
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![Page 1: Organic Functional Group Composition and Sources of Ambient Aerosol during CalNex 2010 Amanda Frossard, Lynn Russell, Scripps Institution of Oceanography,](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfe11a28abf838cb3dc5/html5/thumbnails/1.jpg)
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 QuinnPacific Marine Environmental Laboratory, NOAA
Photo Credit: P.M. Shaw
![Page 2: Organic Functional Group Composition and Sources of Ambient Aerosol during CalNex 2010 Amanda Frossard, Lynn Russell, Scripps Institution of Oceanography,](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfe11a28abf838cb3dc5/html5/thumbnails/2.jpg)
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
![Page 3: Organic Functional Group Composition and Sources of Ambient Aerosol during CalNex 2010 Amanda Frossard, Lynn Russell, Scripps Institution of Oceanography,](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfe11a28abf838cb3dc5/html5/thumbnails/3.jpg)
Organic Aerosol Sampling
Mass Flow Meter and ControllerTotal: 16.8 lpm
Vacuum Pump
PM1 Cyclone
2 pairs of Teflon filters
Dried to 55% RH
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Organic Aerosol Sampling
Four Sampling Regions:
Southern California
Coastal Transit
San Francisco
Sacramento
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Organic Mass CompositionSouthern California Coastal Transit San Francisco Sacramento
![Page 6: Organic Functional Group Composition and Sources of Ambient Aerosol during CalNex 2010 Amanda Frossard, Lynn Russell, Scripps Institution of Oceanography,](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfe11a28abf838cb3dc5/html5/thumbnails/6.jpg)
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 Sacramento2.11 μg m-3 0.51 μg m-3 0.58 μg m-3 0.78 μg m-3
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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
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Source Contributions
More oxygenated“aged”76% of OM
Less oxygenated“fresh”12% of OM
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Source ContributionsSouthern California Coastal Transit San Francisco Sacramento
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Combustion FactorsLess oxygenated More oxygenated
Russell et al. 2011, in press
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Oxygenated Combustion Factor
r = 0.82 Expect that most sulfate is secondary, so correlation with OM suggests the OM is also SOA
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Single Particles: Sacramento
Combustion
Secondary
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Single Particles: LA HarborCombustion
Secondary
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Source Contributions• Organic Mass • Carboxylic Acid
Concentration
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Source Contributions
• Aged Combustion • Fresh Combustion
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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
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Thanks!
Acknowledgements:• Scientists and crew of R/V Atlantis• The LBNL Beamline group• Russell group• Dan Czizco and PNNL• PMEL and Uva Atlantis Groups