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The effect of H2O adsorption on cloud drop activation of insoluble particles: a theoretical framework

by R. Sorjamaa, a. Laaksonen
Atmospheric Chemistry and Physics ()
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Abstract

Cloud droplet activation of wettable insoluble compounds has been studied theoretically by assuming that droplet growth happens through multilayer adsorption. The idea is to include an adsorption isotherm in K¨ ohler theory instead of the solute term. This makes it possible to de- scribe the equilibrium growth of insoluble particles and to find out their critical saturation ratios. The critical satura- tion ratios calculated in this way are comparable to those of completely soluble particles at certain ranges of adsorption isotherm parameter values. The results indicate that adsorp- tion could cause wettable insoluble compounds to activate in atmospheric conditions. However, more data on the adsorp- tion parameters for wettable organic substances is needed to confirm this conclusion.

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