A single parameter representation of hygroscopic growth and cloud condensation nucleus activity - Part 3: Including surfactant partitioning
A single parameter representation of hygroscopic growth and cloud condensation nucleus activity - Part 3: Including surfactant partitioning
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DOI：
10.5194/acp-13-1081-2013
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发表时间：
2013-01-01
影响因子：
6.3
通讯作者：
Kreidenweis, S. M.
中科院分区：
文献类型：
--
作者：
Petters, M. D.;Kreidenweis, S. M.
大气颗粒物可以作为大气中的云凝结核。颗粒中表面活性化合物的存在可能会影响激活颗粒所需的临界过饱和度。然而，在科勒理论的背景下对表面活性剂进行建模很困难，因为表面活性剂的富集意味着液滴中必须存在稳定的径向浓度梯度。在这项研究中，我们引入了一种混合模型，该模型在云凝结核活动的单参数表示的背景下解释了体相和表面相之间的划分。所提出的公式结合了表面活性剂分配的分析近似，以产生一组保持单参数框架的概念和数学简单性的方程。所得方程组允许单参数模型的用户通过对现有代码进行微小修改来解释表面活性剂分配。
Atmospheric particles can serve as cloud condensation nuclei in the atmosphere. The presence of surface active compounds in the particle may affect the critical supersaturation that is required to activate a particle. Modelling surfactants in the context of Kohler theory, however, is difficult because surfactant enrichment at the surface implies that a stable radial concentration gradient must exist in the droplet. In this study, we introduce a hybrid model that accounts for partitioning between the bulk and surface phases in the context of single parameter representations of cloud condensation nucleus activity. The presented formulation incorporates analytical approximations of surfactant partitioning to yield a set of equations that maintain the conceptual and mathematical simplicity of the single parameter framework. The resulting set of equations allows users of the single parameter model to account for surfactant partitioning by applying minor modifications to already existing code.