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Evidence for significant particulate organic nitrate formation in the Los Angeles Basin at night

Schulze, Benjamin and Kenseth, Christopher and Buenconsejo, Reina and Van Rooy, Paul and Huang, Yuanlong and Parker, Harrison and Crounse, John D. and Barletta, Barbara and Meinardi, Simone and Blake, Donald Ray and Barsanti, Kelley and Wennberg, Paul and Seinfeld, John H. (2021) Evidence for significant particulate organic nitrate formation in the Los Angeles Basin at night. In: 262nd ACS National Meeting & Exposition, 22-26 August 2021, Atlanta, GA.

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Oxidn. of biogenic volatile org. compds. (BVOCs) by the nitrate radical (NO₃) represents a potentially efficient secondary org. aerosol (SOA) formation pathway. However, the contribution of nighttime NO₃-BVOC chem. to urban OA prodn. remains poorly constrained. Here, we present measurements of submicrometer aerosol compn. obtained at Caltech (Pasadena, CA) with an Aerodyne HR-ToF-AMS in May-June 2020. At night (19:00-6:00), a majority (>70%) of AMS-derived aerosol nitrate is org., and particulate org. nitrates (pONs) constitute up to 20-30% of total AMS-derived OA. Notably, clear increases in pON mass loadings are obsd. after sunset that correlate strongly with the prodn. rate of NO₃. The mass spectral signature of a pON-assocd. org. aerosol factor extd. using pos. matrix factorization (PMF) is compared to lab. SOA formed from NO₃ oxidn. of individual monoterpenes to aid source identification. Box model simulations reproduce obsd. overnight pON formation using reasonable SOA yields from NO₃ oxidn. of monoterpenes (~40%). Comparison to data collected in 2010 suggests that a major shift in the dominant nighttime nitrate aerosol formation pathway has occurred in the last decade. The observation of substantial NO₃-derived pON prodn. highlights the increasing importance of biogenic emissions to urban aerosol loadings and NO_x loss processes.

Item Type:Conference or Workshop Item (Paper)
Related URLs:
URLURL TypeDescription Website
Schulze, Benjamin0000-0002-6405-8872
Kenseth, Christopher0000-0003-3188-2336
Buenconsejo, Reina0000-0002-0162-905X
Van Rooy, Paul0000-0003-1193-0994
Huang, Yuanlong0000-0002-6726-8904
Parker, Harrison0000-0002-0041-2764
Crounse, John D.0000-0001-5443-729X
Barletta, Barbara0000-0003-3046-014X
Meinardi, Simone0000-0003-4828-9889
Barsanti, Kelley0000-0002-6065-8643
Wennberg, Paul0000-0002-6126-3854
Seinfeld, John H.0000-0003-1344-4068
Additional Information:© 2021 American Chemical Society.
Record Number:CaltechAUTHORS:20211215-163227176
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:112462
Deposited By: Tony Diaz
Deposited On:15 Dec 2021 18:56
Last Modified:15 Dec 2021 18:56

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