Science Advances

Supplementary Materials

This PDF file includes:

  • Section S1. Flux of OH from the gas phase to the droplet
  • Section S2. Photon flux determination
  • Section S3. Further discussion of the rate of the OH burst
  • Section S4. Relationship between OH formation and biomass burning aerosol
  • Section S5. Quantification of H2O2 in the extraction solutions
  • Section S6. Dependence of OH formation on the dilution factor
  • Section S7. Potential acetyloxy or methoxy terephthalate formation and interference with fluorescence measurements
  • Section S8. Concentration and light dependence of OH formation from PAA and Fe(II)
  • Section S9. Peroxides in SOA
  • Section S10. Cloud drop lifetime
  • Section S11. Escape/consumption of OH in droplets
  • Fig. S1. Relationship between initial OH measured on-site in fresh samples and the quantity of biomass burning aerosol.
  • Fig. S2. Uncorrected and corrected BBA mass for all Fresno samples combined.
  • Fig. S3. Relationship between mass-normalized OH formation and dilution factor.
  • Fig. S4. Relationship between mass-normalized OH formation and dilution factor.
  • Fig. S5. Concentration dependence of OH formation in the dark in aqueous pH 3.5 solution over the concentration range of 1 to 10 μM.
  • Fig. S6. OH formation in light (320 ± 10 nm) and dark from solutions of PAA and Fe(II) at pH 3.5 about 2 min after mixing.
  • Fig. S7. Time scale ranges for loss pathways for hydroxyl radicals in cloud droplets, assuming a 0.2- to 0.4-μm-diameter initial particle (diffusive loss to gas phase) and 5 to 35% water soluble organic carbon (WSOC) (reactive loss).
  • Table S1. Yields and concentrations of peroxides determined in previous laboratory SOA experiments.
  • References (4283)

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