Photo-oxidation of pinonaldehyde at low NOx: from chemistry to organic aerosol formation Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
18 Mar 2013
Received: 05 Mar 2012 – Published in Atmos. Chem. Phys. Discuss.: 19 Mar 2012 Abstract. Pinonaldehyde oxidation by OH radicals under low-NOx conditions
produces significant secondary organic aerosol (SOA) mass yields. Under
concurrent UV illumination, mass yields are lower than high-NOx
yields published earlier by our group. However, when OH radicals are produced via
dark ozonolysis the SOA mass yields are comparable at high and low NOx.
Because pinonaldehyde is a major first-generation gas-phase product of
α-pinene oxidation by either ozone or OH radicals, its potential to
form SOA serves as a molecular counterpoint to bulk SOA aging experiments
involving SOA formed from α-pinene. Both the general tendency for
aging reactions to produce more SOA and the sensitivity of the low-NOx
products to UV photolysis observed in the bulk clearly occur for this single
species as well. Photochemical oxidation of pinonaldehye and analogous
first-generation terpene oxidation products are potentially a significant
source of additional SOA in biogenically influenced air masses.
Revised: 25 Feb 2013 – Accepted: 28 Feb 2013 – Published: 18 Mar 2013
Citation: Chacon-Madrid, H. J., Henry, K. M., and Donahue, N. M.: Photo-oxidation of pinonaldehyde at low NOx: from chemistry to organic aerosol formation, Atmos. Chem. Phys., 13, 3227-3236, doi:10.5194/acp-13-3227-2013, 2013.