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Discussion papers | Copyright
https://doi.org/10.5194/acp-2018-418
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 10 Jul 2018

Research article | 10 Jul 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Importance of Biogenic Volatile Organic Compounds to Peroxyacyl Nitrates (PANs) Production in the Southeastern U.S. during SOAS 2013

Shino Toma1, Steve Bertman1, Christopher Groff2, Fulizi Xiong2, Paul B. Shepson2, Paul Romer3, Kaitlin Duffey3, Paul Wooldridge3, Ronald Cohen3, Karsten Baumann4, Eric Edgerton4, Abigail R. Koss5,7,a, Joost de Gouw5, Allen Goldstein6, Weiwei Hu7,8, and Jose L. Jimenez7,8 Shino Toma et al.
  • 1Department of Chemistry, Western Michigan University, Kalamazoo, MI, USA
  • 2Departments of Chemistry, and Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN, USA
  • 3Department of Chemistry, University of California, Berkeley, CA, USA
  • 4Atmospheric Research & Analysis, Inc., Cary, NC, USA
  • 5NOAA ESRL Chemical Sciences Division, Boulder, CO, USA
  • 6Department of Environmental Science, Policy and Management, University of California, Berkeley, CA, USA
  • 7Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA
  • 8Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado, USA
  • anow at: Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA

Abstract. Gas-phase atmospheric concentrations of PAN, PPN, and MPAN were measured at the ground using GC-ECD during the SOAS 2013 campaign (1 June to 15 July 2013) in Centerville, Alabama in order to study biosphere-atmosphere interactions. Average levels of PAN, PPN and MPAN were 169, 5, and 9pptv respectively, and the sum accounts for an average of 15% of NOy during the daytime (10am to 4pm local time). Higher concentrations were seen on average in air that came to the site from the urban NOx sources to the north. PAN levels were the lowest observed in ground measurements over the past two decades in the Southeastern U.S. Analysis of PAN/NOx indicates PAN production in this region was sensitive to NOx. A multiple regression analysis indicates that biogenic VOCs account for 66% of PAN formation in this region of the Southeastern U.S. Comparison of this value with a 0-D model simulation of peroxyacetyl radical production indicates that at least 50% of PAN formation is due to isoprene oxidation. MPAN has a statistical correlation with isoprene hydroxynitrates (IN) with an average MPANppb/INppb ratio of 0.3. Organic aerosol mass increases with gas-phase MPAN and IN concentrations, but the mass of organic nitrates in particles is largely insensitive to MPAN. Isoprene and PAN play a significant role in the atmospheric chemistry in the Southeastern United States.

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