Li and co-workers investigated the new particle formation events in Beijing with a cluster dynamics-multicomponent sectional model. The simulation yields a rich set of information including the time dependent NPF rates, the cluster concentrations, the particle size distributions, and the time- and size-specific particle chemical compositions. They found that the simulations roughly captured the evolution of the observed particle size distributions, and the agreement between the simulation and the observation was improved after the particle growth rates were modulated in the simulation by adjusting the abundance of oxygenated organic molecules. In general, the manuscript is well written and is of broad interest to the readership of Atmospheric Chemistry and Physics. I can recommend publication in Atmospheric Chemistry and Physics after the following comments have been addressed.

Specific Comments:

Lines 113-114: “..., but the Gibbs free energy of formation of SA₁DMA₁ is set to -14.0 kcal/mol at 298 K, ...”

Please illustrate the potential reasons for setting of the Gibbs free energy of formation of SA₁DMA₁ in the present paper.

Lines 123-124: “More volatile organics may react in the particle phase to form low volatility products and promote particle growth”

The relevant references should be cited for this point of view.

Line 334: “... (mainly because these processes in the newly formed particles are poorly understood), ... ”

The relevant references should be cited for this point of view.

Lines 334-336: “..., OOMs concentration amplification may have similar enhancing effects on particle growth as incorporating heterogeneous reactions which leads to the formation of low volatility products.”

Are there any restrictions on the amplification of OOMs concentration to enhance the particle growth in the cluster dynamics-multicomponent sectional model?

Figure 6: Why are the lines in Figure 6 (c1) are oscillating while the other lines in Figures 6 (c2) and (c3) are smooth?

Technical corrections:

Line 141: The i in some sentences, such as “... m_p,i is the mass of species i in the particle, ... ”, should be in italics.

Line 222: “Figs. 2a” should be “Fig. 2a”. Other similar statements should be corrected.

Line 261: “particles formed later in an event has shorter growth time and contribute smaller particles to the mode” should be “particles formed later in an event have shorter growth time and contribute smaller particles to the mode”.

Line 271: “..., and the average mode diameter normalized by the observed values.” should be “..., and the average mode diameter normalized by the observed values, respectively”.