Modelling the formation of organic particles in the atmosphere

被引:37
作者
Anttila, T
Kerminen, VM
Kulmala, M
Laaksonen, A
O'Dowd, CD
机构
[1] Finnish Meteorol Inst, FIN-00880 Helsinki, Finland
[2] Univ Helsinki, Dept Phys Sci, FIN-00014 Helsinki, Finland
[3] Univ Kuopio, Dept Appl Phys, FIN-70211 Kuopio, Finland
[4] Natl Univ Ireland, Dept Expt Phys, Galway, Ireland
关键词
D O I
10.5194/acp-4-1071-2004
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Particle formation resulting from activation of inorganic stable clusters by a supersaturated organic vapour was investigated using a numerical model. The applied aerosol dynamic model included a detailed description of the activation process along with a treatment of the appropriate aerosol and gas-phase processes. The obtained results suggest that both gaseous sulphuric acid and organic vapours contribute to organic particle formation in continental background areas. The initial growth of freshly-nucleated clusters is driven mainly by condensation of gaseous sulphuric acid and by a lesser extent self-coagulation. After the clusters have reached sizes of around 2 nm in diameter, low-volatile organic vapours start to condense spontaneously into the clusters, thereby accelerating their growth to detectable sizes. A shortage of gaseous sulphuric acid or organic vapours limit, or suppress altogether, the particle formation, since freshly-nucleated clusters are rapidly coagulated away by pre-existing particles. The obtained modelling results were applied to explaining the observed seasonal cycle in the number of aerosol formation events in a continental forest site.
引用
收藏
页码:1071 / 1083
页数:13
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