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. 2023 Sep 8;9(36):eadi5297. doi: 10.1126/sciadv.adi5297

Fig. 1. Example pure biogenic NPF experiment in CLOUD.

Fig. 1.

Here, we show a representative mixture run with all three BVOCs (β-caryophyllene, α-pinene, and isoprene) in three concentration steps, with an injected ratio 1:6:50 (β-caryophyllene, α-pinene, and isoprene), 40 ppbv (parts per billion by volume) O3, T = +5°C, relative humidity (RH) = 40%, and full UV lamp intensity; runs 12 to 14 (see table S1). (A) The combined particle number size distribution measured using a full suite of particle measuring instruments (see the “Particle counters” section in Materials and Methods). (B) Evolution of precursor vapor measured concentrations, α-pinene, β-caryophyllene, and isoprene. The three experimental stages are separated by vertical gray lines. (C) Evolution of formation rate of particles with diameter >1.7 nm (J1.7) and condensation sink (CS). (D) Evolution of oxidation product concentrations measured with NO3-CIMS, total OOMs, extremely low volatility organic compounds (ELVOCs), and ultralow volatility organic compounds (ULVOCs).