On the CCN [de]activation nonlinearities
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چکیده
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 saddlenode bifurcation and a cusp catastrophe. The control param5 eters 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 10 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 con15 text of the development of particle-based models of aerosolcloud interactions in which activation and deactivation impose stringent time-resolution constraints on numerical integration.
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Interactive comment on “On the CCN [de]activation nonlinearities” by S. Arabas and S. Shima
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Interactive comment on “ On the CCN [ de ] activation nonlinearities ” by S . Arabas and S .
The paper is dedicated to stability and bifurcation analysis of diffusion growth equation in its complete form, which includes curvature term and chemical composition term. Authors show that critical point on the Kohler curve is the point of saddle-node bifurcation. The time scale associated with this point which can be interpreted as time scale of aerosol activation is estimated analytically. ...
متن کاملInteractive comment on “On the CCN [de]activation nonlinearities” by S. Arabas and S. Shima
The authors discuss cloud droplet activation and deactivation in terms of saddle-node bifurcation. By doing so they can employ a nonlinear dynamic approach to study the properties of such processes. Specifically, they approximate the drop growth by diffusion equation to a normal form of a saddle-node bifurcation (df/dt = a + fËĘ2) and therefore they could use the properties of such form to stud...
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تاریخ انتشار 2016