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Aircraft Aerosol Mass Spectrometer Measurements over the Los Angeles Basin during CalNex

Aircraft Aerosol Mass Spectrometer Measurements over the Los Angeles Basin during CalNex. Jill S. Craven Caltech, Seinfeld/ Flagan Research Group Presented at CalNex Data Analysis Workshop. Flight Path Overview. CIRPAS Twin Otter. LA Basin Aerosol Composition: Regional Differences.

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Aircraft Aerosol Mass Spectrometer Measurements over the Los Angeles Basin during CalNex

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  1. Aircraft Aerosol Mass Spectrometer Measurements over the Los Angeles Basin during CalNex Jill S. Craven Caltech, Seinfeld/Flagan Research Group Presented at CalNex Data Analysis Workshop

  2. Flight Path Overview CIRPAS Twin Otter

  3. LA Basin Aerosol Composition: Regional Differences

  4. LA Basin Aerosol Mass Fraction

  5. LA Basin Average Organic Mass Spectrum

  6. LA Basin Difference Spectra May 28 Flight

  7. LA Basin vs Outflow Aerosol Composition

  8. Outflow Difference Organic Mass Spectrum

  9. Organic Composition vs Longitude

  10. f44 vs f43 plot PACO Study from 2009 Hersey et al. 2010 ACPD CalNex Twin Otter Data Ng et al. 2010 ACP • Organic Aerosol in LA Basin at 1200 feet AGL is mostly SV-OOA type aerosol • Future PMF analysis will rigorously show the different contributions to LA Basin organic aerosol • m/z 44 (mostly CO2+) • m/z 43 (mostly C2H3O+) • spectral signatures of acid-derived species and non-acid oxygenates, respectively • f44=(m/z44)/(total organic) • f43=(m/z43)/(total organic) • Organic aerosol composition varies over summer months

  11. Vertical Profiles

  12. Aerosol Nitrate • Aerosol Nitrate in both Los Angeles and Bakersfield is largely inorganic nitrate

  13. Acknowledgements Poster 23: Black Carbon • NOAA • CIRPAS Mechanic, Pilots, and Scientists • Scientists from University of Arizona, Georgia Tech, University of California San Diego and Caltech Poster 24: CCN Poster 26: WSOC

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