Atmospheric Chemistry and Physics, vol. 13, issue 7 (2013) pp. 3763-3776
The formation of carboxylic acids and dimer esters from α-pinene oxidation was investigated in a smog cham- ber and in ambient aerosol samples collected during the Bio- sphere Effects on Aerosols and Photochemistry Experiment (BEARPEX). Chamber experiments of α-pinene ozonoly- sis in dry air and at low NOx concentrations demonstrated formation of two dimer esters, pinyl-diaterpenyl (MW 358) and pinonyl-pinyl dimer ester (MW 368), under both low- and high-temperature conditions. Concentration levels of the pinyl-diaterpenyl dimer ester were lower than the assumed first-generation oxidation products cis-pinic and terpenylic acids, but similar to the second-generation oxidation prod- ucts 3-methyl-1,2,3-butane tricarboxylic acid (MBTCA) and diaterpenylic acid acetate (DTAA). Dimer esters were ob- served within the first 30 min, indicating rapid production si- multaneous to their structural precursors. However, the sam- pling time resolution precluded conclusive evidence regard- ing formation from gas- or particle-phase processes. CCN activities of the particles formed in the smog chamber dis- played a modest variation during the course of experiments, with κ values in the range 0.06–0.09 (derived at a supersatu- ration of 0.19%).
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