Organic aerosol formation via sulphate cluster activation
Organic aerosol formation via sulphate cluster activation
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DOI：
10.1029/2003jd003961
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发表时间：
2004-02-25
影响因子：
4.4
通讯作者：
O'Dowd, CD
中科院分区：
文献类型：
--
作者：
Kulmala, M;Kerminen, VM;O'Dowd, CD
气溶胶的形成，以及随后的云凝结核，仍然是最不为人所知的大气过程之一，而全球气候变化严重依赖于这个过程。在大气条件下，均匀成核（尺寸为-1 nm的稳定团簇的形成）及其随后生长成新粒子（尺寸为- 3 nm）的过程决定了气溶胶和云核的数量，但迄今为止，还没有理论详细解释新粒子形成现象。在这项研究中，我们提出了一个新的理论，为有机蒸汽激活稳定的无机团簇形成新粒子提供了机制解释。新的纳米粒子活化理论类似于科勒理论，科勒理论描述了在过饱和水蒸汽场中云的形成，但不同之处在于它描述了无机稳定纳米团簇在过饱和有机蒸汽中活化成气溶胶粒子，从而引发团簇的自发和快速生长。将新理论纳入气溶胶形成模型预测，有机蒸汽密度的增加会导致颗粒产生的更大增加，而这反过来又会影响大气气溶胶的全球辐射冷却效应。
[ 1] The formation of aerosols, and subsequent cloud condensation nuclei, remains one of the least understood atmospheric processes upon which global climate change critically depends. Under atmospheric conditions, the process of homogeneous nucleation (formation of stable clusters -1 nm in size), and their subsequent growth into new particles (>3 nm), determines the aerosol and cloud nuclei population, yet, hitherto, no theory has elucidated the new particle formation phenomenon in detail. In this study, we present a new theory which provides a mechanistic explanation for new particle formation via activation of stable inorganic clusters by organic vapors. The new nano-particle activation theory is analogous to Kohler theory which describes cloud formation in a supersaturated water vapor field but differs in that it describes the activation of inorganic stable nano-clusters into aerosol particles in a supersaturated organic vapor which initiates spontaneous and rapid growth of clusters. Inclusion of the new theory into aerosol formation models predicts that increases in organic vapor densities lead to even greater increases in particle production, which, in turn, will influence the global radiative cooling effect of atmospheric aerosols.