AAAR 31st Annual Conference
October 8-12, 2012
Hyatt Regency Minneapolis
Minneapolis, Minnesota, USA
Abstract View
Organic Aerosol Characterization of the Los Angeles Basin from Aircraft Measurements during CalNex
JILL CRAVEN, Andrew Metcalf, Richard Flagan, John Seinfeld, Caltech
Abstract Number: 358 Working Group: Urban Aerosols
Abstract An Aerodyne C-ToF Aerosol Mass Spectrometer was deployed on the CIRPAS Twin Otter in May 2010 during the CalNex field campaign. The organic aerosol, composing just above 40 % of the total aerosol mass for the Basin on average, is decomposed into HOA and OOA-like factors with PMF analysis. High organic aerosol loadings were measured downwind of downtown Los Angeles resembling HOA-like aerosol, whereas the Northeastern region of the Basin with similar load- ings was richer in OOA-like aerosol. The O:C ratio of the aerosol in the Basin, was lower than that measured in the Basin outflow. PMF results are supported with AMS inorganic mass time traces, SP2 measurements of black carbon mass loading and coating thickness, and compared to previous field campaign organic mass spectra.