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Abstract. Gas-phase atmospheric concentrations of peroxyacetyl nitrate (PAN),peroxypropionyl nitrate (PPN), and peroxymethacryloyl nitrate (MPAN) weremeasured on the ground using a gas chromatograph electron capture detector(GC-ECD) during the Southern Oxidants and Aerosols Study (SOAS) 2013 campaign(1 June to 15 July 2013) in Centreville, Alabama, in order to studybiosphere–atmosphere interactions. Average levels of PAN, PPN, and MPAN were169, 5, and 9 pptv, respectively, and the sum accounts for an average of16 % of NOy during the daytime (10:00 to 16:00 localtime). Higher concentrations were seen on average in air that came to thesite from the urban NOx sources to the north. PAN levelswere the lowest observed in ground measurements over the past two decades inthe southeastern US. A multiple regression analysis indicates that biogenicvolatile organic compounds (VOCs) account for 66 % of PAN formationduring this study. Comparison of this value with a 0-D model simulation ofperoxyacetyl radical production indicates that at least 50 % of PANformation is due to isoprene oxidation. MPAN has a statistical correlationwith isoprene hydroxynitrates (IN). Organic aerosol mass increases withgas-phase MPAN and IN concentrations, but the mass of organic nitrates inparticles is largely unrelated to MPAN.
