Influence of Aerosol Chemical Composition on Condensation Sink Efficiency and New Particle Formation in Beijing.

ABSTRACT: Relatively high concentrations of preexisting particles, acting as a condensation sink (CS) of gaseous precursors, have been thought to suppress the occurrence of new particle formation (NPF) in urban environments, yet NPF still occurs frequently. Here, we aim to understand the factors promoting and inhibiting NPF events in urban Beijing by combining one-year-long measurements of particle number size distributions and PM_2.5 chemical composition. Our results show that indeed the CS is an important factor controlling the occurrence of NPF events, with its chemical composition affecting the efficiency of the background particles in removing gaseous H₂SO₄ (effectiveness of the CS) driving NPF. During our observation period, the CS was found to be more effective

SUBMITTER: Du W 

PROVIDER: S-EPMC9097482 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature