资源环境科技发展态势分析平台

The new particle formation (NPF) effect on cloud condensation nuclei (CCN) differs from region to region and remains highly uncertain. Here, we re-evaluate the NPF-initiated enhancements in CCN number concentrations (E_N_CCN) by compiling results from 35 field sites worldwide and 5 global models. We show the E_N_CCN at sites close to the anthropogenic sources are more than 2-fold as large as that at remote sites with supersaturations of 0.1-1.0%. The enhancements anti-correlate with the time scales for the new particles to grow to CCN size, which are 5-10 and 20-30 hours at polluted and remote sites, respectively. We further reveal that under polluted environments the condensational growth of new particles may be accelerated, leading to larger E_N_CCN. The models fail to simulate the E_N_CCN in polluted regions. Our study highlights the importance of parameterizing the time scale of NPF to affect CCN differently for remote and polluted regions in models.