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On the CCN (de)activation?nonlinearities

机译:关于CCN(去激活)非线性

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We take into consideration the evolution of particle size in a monodisperse aerosol population during activation and deactivation of cloud condensation nuclei (CCN). Our analysis reveals that the system undergoes a saddle-node bifurcation and a cusp catastrophe. The control parameters chosen for the analysis are the relative humidity and the particle concentration. An analytical estimate of the activation timescale is derived through estimation of the time spent in the saddle-node bifurcation bottleneck. Numerical integration of the system coupled with a simple air-parcel cloud model portrays two types of activation/deactivation hystereses: one associated with the kinetic limitations on droplet growth when the system is far from equilibrium, and one occurring close to equilibrium and associated with the cusp catastrophe. We discuss the presented analyses in context of the development of particle-based models of aerosol–cloud interactions in which activation and deactivation impose stringent time-resolution constraints on numerical integration.
机译:我们考虑了在云凝结核(CCN)激活和失活期间单分散气溶胶种群中粒径的演变。我们的分析表明,该系统经历了鞍节点分叉和尖峰灾难。选择用于分析的控制参数是相对湿度和颗粒浓度。通过估计在鞍形节点分叉瓶颈中所花费的时间,可以得出激活时间尺度的分析估计。系统的数值积分与简单的气团云模型相结合,描绘了两种类型的激活/停用磁滞现象:一种与系统远离平衡状态时液滴生长的动力学限制有关,另一种与平衡状态有关且与液滴生长有关。尖峰灾难。我们在基于粒子的气溶胶-云相互作用模型的发展背景下讨论了提出的分析,其中激活和失活对数值积分施加了严格的时间分辨率约束。

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