当前位置：
X-MOL 学术
›
Atmos. Chem. Phys.
›
论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Survival probabilities of atmospheric particles: comparison based on theory, cluster population simulations, and observations in Beijing
Atmospheric Chemistry and Physics ( IF 6.3 ) Pub Date : 2022-08-05 , DOI: 10.5194/acp-2022-484 Santeri Tuovinen , Runlong Cai , Veli-Matti Kerminen , Markku Kulmala , Jingkun Jiang , Chao Yan , Jenni Kontkanen
Atmospheric Chemistry and Physics ( IF 6.3 ) Pub Date : 2022-08-05 , DOI: 10.5194/acp-2022-484 Santeri Tuovinen , Runlong Cai , Veli-Matti Kerminen , Markku Kulmala , Jingkun Jiang , Chao Yan , Jenni Kontkanen
Abstract. Atmospheric new particle formation (NPF) events are regularly observed in urban Beijing, despite high concentrations of background particles which, based on theory, should inhibit NPF due to high values of coagulation sink (CoagS). The survival probability, which depends on both CoagS and particle growth rate (GR) is a key parameter in determining occurrence of NPF events, as it describes the fraction of newly formed particles that survive from a smaller diameter to a larger diameter. In this study, we investigate and compare survival probabilities from 1.5 to 3 nm (J3/J1.5), from 3 to 6 nm (J6/J3) and from 6 to 10 nm (J10/J6) based on analytical formulae, cluster population simulations, and atmospheric observations from Beijing. We find that survival probabilities based on the cluster population simulations and one of the analytical formulae are in a good agreement. However, at low ratios between the background condensation sink (CS) and GR, and at high concentrations of sub-3 nm clusters, cluster-cluster collisions efficiently lower survival probabilities in the cluster population simulations. Due to the large concentrations of clusters and small particles required to considerably affect the survival probabilities, we consider it unlikely that cluster-cluster collisions significantly affect atmospheric survival probabilities. The values of J10/J6 observed in Beijing show high variability, most likely due to influences of primary particle emissions, but are on average in a relatively good agreement with the values based on the simulations and the analytical formula. The observed values of J6/J3 are mostly lower than those predicted based on the simulations and the analytical formula, which could be explained by uncertainties in CS and GR. The observed values of J3/J1.5 at high CS/GR are much higher than predicted based on the simulations and the analytical formula. We argue that uncertainties in GR or CS are unlikely to solely explain the observed values of J3/J1.5 under high CS conditions. Thus, further work is needed to better understand the factors influencing survival probabilities of sub-3 nm atmospheric particles in polluted environments.
更新日期：2022-08-05
京公网安备 11010802027423号