Aircraft Aerosol Mass Spectrometer Measurements over the Los Angeles Basin during CalNex Jill S....
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![Page 1: Aircraft Aerosol Mass Spectrometer Measurements over the Los Angeles Basin during CalNex Jill S. Craven Caltech, Seinfeld/Flagan Research Group Presented.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bf9f1a28abf838c94d38/html5/thumbnails/1.jpg)
Aircraft Aerosol Mass Spectrometer Measurements over the Los Angeles Basin
during CalNex
Jill S. CravenCaltech, Seinfeld/Flagan Research Group
Presented at CalNex Data Analysis Workshop
![Page 2: Aircraft Aerosol Mass Spectrometer Measurements over the Los Angeles Basin during CalNex Jill S. Craven Caltech, Seinfeld/Flagan Research Group Presented.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bf9f1a28abf838c94d38/html5/thumbnails/2.jpg)
Flight Path Overview
CIRPAS Twin Otter
RF # Flight Date Mission Type10 5/18/10 San Jaoquin valley, just after a front11 5/19/10 LA Basin, coordinated flight plan, N-S tracks12 5/20/10 San Jaoquin valley, morning clouds; El Cajon pass13 5/21/10 LA Basin, 2 loops, N-S tracks, El Cajon & Banning passes14 5/22/10 San Jaoquin valley, N-S track up to Fresno and back15 5/24/10 LA Basin, with Santa Ana, El Cajon pass, and Salton Sea16 5/25/10 LA Basin, with Santa Ana, El Cajon pass, and Salton Sea17 5/27/10 LA Basin, 3 loops18 5/28/10 LA Basin, 3 loops, with tanker fire on 91
![Page 3: Aircraft Aerosol Mass Spectrometer Measurements over the Los Angeles Basin during CalNex Jill S. Craven Caltech, Seinfeld/Flagan Research Group Presented.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bf9f1a28abf838c94d38/html5/thumbnails/3.jpg)
LA Basin Aerosol Composition: Regional Differences
![Page 4: Aircraft Aerosol Mass Spectrometer Measurements over the Los Angeles Basin during CalNex Jill S. Craven Caltech, Seinfeld/Flagan Research Group Presented.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bf9f1a28abf838c94d38/html5/thumbnails/4.jpg)
LA Basin Aerosol Mass Fraction
![Page 5: Aircraft Aerosol Mass Spectrometer Measurements over the Los Angeles Basin during CalNex Jill S. Craven Caltech, Seinfeld/Flagan Research Group Presented.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bf9f1a28abf838c94d38/html5/thumbnails/5.jpg)
LA Basin Average Organic Mass Spectrum
![Page 6: Aircraft Aerosol Mass Spectrometer Measurements over the Los Angeles Basin during CalNex Jill S. Craven Caltech, Seinfeld/Flagan Research Group Presented.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bf9f1a28abf838c94d38/html5/thumbnails/6.jpg)
LA Basin Difference SpectraMay 28 Flight
![Page 7: Aircraft Aerosol Mass Spectrometer Measurements over the Los Angeles Basin during CalNex Jill S. Craven Caltech, Seinfeld/Flagan Research Group Presented.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bf9f1a28abf838c94d38/html5/thumbnails/7.jpg)
LA Basin vs Outflow Aerosol Composition
![Page 8: Aircraft Aerosol Mass Spectrometer Measurements over the Los Angeles Basin during CalNex Jill S. Craven Caltech, Seinfeld/Flagan Research Group Presented.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bf9f1a28abf838c94d38/html5/thumbnails/8.jpg)
Outflow Difference Organic Mass Spectrum
![Page 9: Aircraft Aerosol Mass Spectrometer Measurements over the Los Angeles Basin during CalNex Jill S. Craven Caltech, Seinfeld/Flagan Research Group Presented.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bf9f1a28abf838c94d38/html5/thumbnails/9.jpg)
Organic Composition vs Longitude
![Page 10: Aircraft Aerosol Mass Spectrometer Measurements over the Los Angeles Basin during CalNex Jill S. Craven Caltech, Seinfeld/Flagan Research Group Presented.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bf9f1a28abf838c94d38/html5/thumbnails/10.jpg)
f44 vs f43 plot
Ng et al. 2010 ACP
• 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 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
CalNex Twin Otter DataPACO Study from 2009Hersey et al. 2010 ACPD
• Organic aerosol composition varies over summer months
![Page 11: Aircraft Aerosol Mass Spectrometer Measurements over the Los Angeles Basin during CalNex Jill S. Craven Caltech, Seinfeld/Flagan Research Group Presented.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bf9f1a28abf838c94d38/html5/thumbnails/11.jpg)
Vertical Profiles
![Page 12: Aircraft Aerosol Mass Spectrometer Measurements over the Los Angeles Basin during CalNex Jill S. Craven Caltech, Seinfeld/Flagan Research Group Presented.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bf9f1a28abf838c94d38/html5/thumbnails/12.jpg)
Aerosol Nitrate
• Aerosol Nitrate in both Los Angeles and Bakersfield is largely inorganic nitrate
![Page 13: Aircraft Aerosol Mass Spectrometer Measurements over the Los Angeles Basin during CalNex Jill S. Craven Caltech, Seinfeld/Flagan Research Group Presented.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bf9f1a28abf838c94d38/html5/thumbnails/13.jpg)
Acknowledgements
• NOAA• CIRPAS Mechanic, Pilots, and Scientists• Scientists from University of Arizona,
Georgia Tech, University of California San Diego and Caltech
Poster 23: Black Carbon
Poster 24: CCN
Poster 26: WSOC