Functionalized Secondary Organic Particle Phase Products from Terpenes and Terpene Oxidation Products (FuProTer II)
Final Report Abstract
FuProTer II aimed to address two questions. i) which first-generation oxidation product contributes significantly to a-pinene oxidation aside from pinonaldehyde and ii) how does the [HO2]/[RO2] influences the SOA formation. i) Myrtenal was identified among the gas-phase products of α-pinene oxidation. A majority of α-pinene SOA marker compounds was indeed formed by myrtenal oxidation, especially terebic acid (84%), pinic acid (76%), and diaterpenylic acid acetate (DTAA; 40%). In general, the contribution of myrtenal to α-pinene SOA is estimated to be as high as 23%. ii) Based on the present dataset the SOA formation tends to increase with higher [HO2]/[RO2] ratios and to decrease in the presence of NOx. Thus, a general conclusion about the influence of the [HO2]/[RO2] on the SOA yield cannot be drawn and has to be examined for each single system separately. On the other hand the study supports the hypothesis that the SOA yield decreases in the presence of NOx. Furthermore, based on the chemical analysis pinonic acid can be excluded to be responsible for SOA formation in the pinonaldehyde/OH/NO system, in particular in the presence of NOx pinonic acid is the highest although SOA yield the lowest. Pinic acid and terpenylic acid can also be excluded to be responsible for SOA formation because they are not formed from pinonaldehyde oxidation.
Publications
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2015. Characterisation and optimisation of a sample preparation method for the detection and quantification of atmospherically relevant carbonyl compounds in aqueous medium. Atmospheric Measurement Techniques 8, 2409-2416
Rodigast, M., Mutzel, A., Iinuma, Y., Haferkorn, S., Herrmann, H.
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2016. Monoterpene SOA – Contribution of first-generation oxidation products to formation and chemical composition. Atmos. Environ. 130, 136-144
Mutzel, A., Rodigast, M., Iinuma, Y., Böge, O., Herrmann, H.
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2017: A quantification method for heat-decomposable methylglyoxal oligomers and its application on 1,3,5-trimethylbenzene SOA, Atmos. Chem. Phys., 17, 3929-3943
Rodigast, M., Mutzel, A., and Herrmann, H.
