Journal article

Formation and occurrence of dimer esters of pinene oxidation products in atmospheric aerosols

Kristensen K, Enggrob K, King S, Worton D, Platt S, Mortensen R, Rosenoern T, Surratt J, Bilde M, Goldstein A, Glasius M ...see all

Atmospheric Chemistry and Physics, vol. 13, issue 7 (2013) pp. 3763-3776

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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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  • K. Kristensen

  • K. L. Enggrob

  • S. M. King

  • D. R. Worton

  • S. M. Platt

  • R. Mortensen

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