Size-dependent influence of NOx on the growth rates of organic aerosol particles

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Science Advances  27 May 2020:
Vol. 6, no. 22, eaay4945
DOI: 10.1126/sciadv.aay4945
  • Fig. 1 Effect of NOx addition on the formation and growth of particles.

    (A) Time series of monoterpenes (C10H16), NOx, and HOM concentration. (B) Particle size distribution showing the four different NPF events detected under different NOx conditions (0, 0.7, 1.9, and 4.5 ppbv). The appearance time of each particle size is marked by white dots, based on which we further determined the size-segregated GRs. (C) Temporal change of the nucleation rate at 1.7 nm (J1.7) as well as the total loss rate (red solid line), which includes both the wall loss rate (red dashed line) and the condensation sink. (D) Normalized GRs at different size ranges. GRs at each specific size range are normalized to that measured under the zero NOx condition, and the ratios represent the suppression by NOx. It should be noted that such suppression degrees are only valid for this specific condition and will vary in other experiments (see fig. S1 and table S1).

  • Fig. 2 Gas-phase HOMs under zero and 1.9 ppbv NOx conditions measured by CI-APi-TOF in the CLOUD chamber.

    (A and B) The spectra of HOMs colored by their types. The pie charts give the fractional contribution of different types of HOMs. (C and D) Mass defect plots showing HOM composition under the two conditions. The x axis is the exact mass of HOMs, and the y axis is the mass defect. The color of circles denotes the type of HOMs, and their size is proportional to the logarithm of the count rate. Each straight line represents a group of compounds with the same number of carbon, hydrogen, and nitrogen but different numbers of oxygen atoms. The line style is the same as that used for the annotation frame.

  • Fig. 3 Thermal desorption of particle-phase HOM dimers measured with the FIGAERO.

    (A) The thermogram of three example molecules under different NOx conditions. Different line styles represent different NOx conditions. The Tmax is defined as the temperature at which the signal intensity reaches the maximum. (B) Correlation between Tmax and mass-to-charge ratio for all HOM dimers. (C) Correlation between Tmax and the effective O:C for all HOM dimers. The size of the circles in (B) and (C) is linearly proportional to the signal intensity of the desorption thermogram.

  • Fig. 4 Volatility distribution of gas-phase HOMs under zero and 1.9 ppbv NOx conditions.

    (A) The summed HOM concentrations of each bin. (B) The cumulative HOM concentrations. Red and blue markers denote HOM concentrations under zero and 1.9 ppbv NOx, respectively. The black dots give the ratio of cumulative concentrations of [HOM]NOx:[HOM]w/o NOx.

Supplementary Materials

  • Supplementary Materials

    Size-dependent influence of NOx on the growth rates of organic aerosol particles

    C. Yan, W. Nie, A. L. Vogel, L. Dada, K. Lehtipalo, D. Stolzenburg, R. Wagner, M. P. Rissanen, M. Xiao, L. Ahonen, L. Fischer, C. Rose, F. Bianchi, H. Gordon, M. Simon, M. Heinritzi, O. Garmash, P. Roldin, A. Dias, P. Ye, V. Hofbauer, A. Amorim, P. S. Bauer, A. Bergen, A.-K. Bernhammer, M. Breitenlechner, S. Brilke, A. Buchholz, S. Buenrostro Mazon, M. R. Canagaratna, X. Chen, A. Ding, J. Dommen, D. C. Draper, J. Duplissy, C. Frege, C. Heyn, R. Guida, J. Hakala, L. Heikkinen, C. R. Hoyle, T. Jokinen, J. Kangasluoma, J. Kirkby, J. Kontkanen, A. Kürten, M. J. Lawler, H. Mai, S. Mathot, R. L. Mauldin III, U. Molteni, L. Nichman, T. Nieminen, J. Nowak, A. Ojdanic, A. Onnela, A. Pajunoja, T. Petäjä, F. Piel, L. L. J. Quéléver, N. Sarnela, S. Schallhart, K. Sengupta, M. Sipilä, A. Tomé, J. Tröstl, O. Väisänen, A. C. Wagner, A. Ylisirniö, Q. Zha, U. Baltensperger, K. S. Carslaw, J. Curtius, R. C. Flagan, A. Hansel, I. Riipinen, J. N. Smith, A. Virtanen, P. M. Winkler, N. M. Donahue, V.-M. Kerminen, M. Kulmala, M. Ehn, D. R. Worsnop

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