Fig. 4: The contributions of different pathways to the formation rate of ~ 1.4 nm particles (J1.4nm).
From: Significant contributions of trimethylamine to sulfuric acid nucleation in polluted environments
a shows the contributions of different pathways with 3 ppt DMA and 0.3–3 ppt TMA. b shows the contributions of TMA-influenced pathways. For each gray marker in (b), temperature and concentration sink (CS) were obtained from measurements in Beijing. These simulation results are grouped by the TMA:DMA ratio and the orange markers and variation bars are the mean and standard deviation of each group. The horizontal stacked bars in (a) and the lines in (b) were simulated at temperature = 281 K and CS = 0.017 s−1, which are medians of the measurement data. Note that the contribution from SA-DMA clusters may also involve TMA (e.g., 4A4D + 1A1T); hence the value for the TMA-influenced pathway in (b) is higher than the sum of contributions from SA-DMA-TMA clusters in (a).
