“…Studies show that soluble gases and aerosols are incorporated into the cloud droplets or ice crystals through scavenging mechanisms (e.g. Pruppacher, 1980;Kalina and Puxbaum, 1994;Dixon et al, 1995;Oberholzer et al, 1992;Schwikowski et al, 1994;Baltensperger et al, 1994Baltensperger et al, , 1998. Bell and Saunders (1995) have investigated the scavenging efficiencies of ice crystals of sizes ranging from 35 to 150 µm and found the scavenging efficiencies vary from 0.2 to 0.9 for aerosol particles in the range 4 to 6 µm.…”