A Laboratory Study of the Local Cooling Resulting from the Dissolution of Soluble Ice Nuclei Having Endothermic Heats of Solution

Abstract

Laboratory experiments were conducted to determine the local cooling resulting from the dissolution of soluble ice nuclei which have endothermic heats of solution. The local cooling was determined from ice nucleation activity measurements. The bulk of the measurements involved an expansion technique which produced a supersaturation to activate the ice nuclei. The local cooling under supersaturated conditions was found to be slightly less than the cooling one would obtain from bulk adiabatic dissolution in forming a saturated solution. The local cooling is greatly reduced when condensation is entirely due to particle hygroscopicity. Maximum local cooling results if nuclei collide with cloud droplets.