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Title: Regional Similarities and NOx-Related Increases in Biogenic Secondary Organic Aerosol in Summertime Southeastern United States

Journal Article · · Journal of Geophysical Research: Atmospheres
ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [2]; ORCiD logo [3];  [3]; ORCiD logo [4];  [4];  [5]; ORCiD logo [6]; ORCiD logo [7];  [8]; ORCiD logo [9];  [6]; ORCiD logo [10]
  1. Univ. of California, San Diego, CA (United States). Scripps Inst. of Oceanography
  2. Federal Inst. of Technology, Lausanne (Switzerland)
  3. Univ. of Colorado, Boulder, CO (United States)
  4. U.S. Environmental Protection Agency, Research Triangle Park, NC (United States). National Exposure Research Laboratory
  5. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  6. Georgia Inst. of Technology, Atlanta, GA (United States)
  7. Harvard Univ., Cambridge, MA (United States)
  8. Nanyang Technological Univ. (Singapore)
  9. Univ. of Wisconsin, Madison, WI (United States)
  10. Univ. of North Carolina, Chapel Hill, NC (United States)

Abstract During the 2013 Southern Oxidant and Aerosol Study, Fourier transform infrared spectroscopy (FTIR) and aerosol mass spectrometer (AMS) measurements of submicron mass were collected at Look Rock (LRK), Tennessee, and Centreville (CTR), Alabama. Carbon monoxide and submicron sulfate and organic mass concentrations were 15–60% higher at CTR than at LRK, but their time series had moderate correlations ( r  ~ 0.5). However, NO x had no correlation ( r  = 0.08) between the two sites with nighttime‐to‐early‐morning peaks 3–10 times higher at CTR than at LRK. Organic mass (OM) sources identified by FTIR Positive Matrix Factorization (PMF) had three very similar factors at both sites: fossil fuel combustion‐related organic aerosols, mixed organic aerosols, and biogenic organic aerosols (BOA). The BOA spectrum from FTIR is similar (cosine similarity > 0.6) to that of lab‐generated particle mass from the photochemical oxidation of both isoprene and monoterpenes under high NO x conditions from chamber experiments. The BOA mass fraction was highest during the night at CTR but in the afternoon at LRK. AMS PMF resulted in two similar pairs of factors at both sites and a third nighttime NO x ‐related factor (33% of OM) at CTR but a daytime nitrate‐related factor (28% of OM) at LRK. NO x was correlated with BOA and LO‐OOA for NO x concentrations higher than 1 ppb at both sites, producing 0.5  ±  0.1  μ g/m 3 for CTR‐LO‐OOA and 1.0  ±  0.3  μ g/m 3 for CTR‐BOA additional biogenic OM for each 1 ppb increase of NO x .

Research Organization:
Univ. of California, San Diego, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0006431; DE‐SC0006431
OSTI ID:
1539758
Alternate ID(s):
OSTI ID: 1472149
Journal Information:
Journal of Geophysical Research: Atmospheres, Vol. 123, Issue 18; ISSN 2169-897X
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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  • C., Flagan, Richard; C., Eddingsaas, Nathan; L., Loza, Christine
  • The University of North Carolina at Chapel Hill University Libraries https://doi.org/10.17615/sz9v-nb58
text January 2009
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Cited By (1)

Quantifying organic matter and functional groups in particulate matter filter samples from the southeastern United States – Part 1: Methods journal January 2019