Science Advances

Supplementary Materials

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  • Fig. S1. Real-time particle measurement in Hyytiälä.
  • Fig. S2. Wind directions above the canopy and organic mass measured by the ACSM in Hyytiälä.
  • Fig. S3. Similarity scores between the α-pinene ozonolysis and ambient Hyytiälä mass spectra from the current study (see Fig. 1) with each other as well as with EESI-TOF mass spectra from source apportionment of summer measurements in Zurich (23) and from laboratory aging of emission from a domestic wood stove.
  • Fig. S4. Time evolution of gas-phase species as measured by PTR-TOF-MS (α-pinene) and nitrate CIMS (HOM-grouped based on their number of carbons).
  • Fig. S5. Atomic O:C ratio as a function of carbon number for monomer and dimer products.
  • Fig. S6. Fraction of signal remaining (calculated as the ratio of the final signal after 12 hours to the signal at the point of the maximum mass concentration for the respective ion) for all species measured by the EESI-TOF plotted against their saturation vapor concentration (logC*).
  • Fig. S7. Example of time evolution for two dimer species (C20H32O9 and C19H30O9) measured in the particle by the EESI-TOF, illustrating calculation methods for time of maximum and decay rate.
  • Fig. S8. Comparison of EESI-TOF and FIGAERO-I-CIMS.
  • Fig. S9. Effect of OH scavenger on monomer and dimer composition.
  • Fig. S10. Selected time series from an experiment in which butanol was added as an OH scavenger.
  • Fig. S11. Comparison of EESI-TOF and SMPS measurements.
  • Table S1. Overview of experimental conditions.
  • Table S2. Decay rates and fractions remaining for selected ions as measured by the EESI-TOF.
  • Reference (54)

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