Abstract
Precipitation samples collected on board Indian Naval ships over the oceans surrounding peninsular India during MONEX-79 experimental programme of GARP, were assayed for Na, Cl, Mg, Ca, K, Sb, Th, Fe, Zn, Sc, Cr, Co and SO 4 concentrations. The Na/Cl and Mg/Cl distribution is observed to be in the same ratio as that found in sea water. SO 4/Na ratio in rain water also lies very close to sea water ratio of 0.25, unlike that reported for marine aerosols. K and Ca levels indicate an enrichment with reference to Na. Samples collected far away from the coast suggest enrichment of Ca in the sea salt aerosol and that from nearer the coast also gave high Ca excesses indicative of its contribution from the land. Major source of Fe and Sc appears to be of soil origin, while continental derived elements of anthropogenic origin such as Zn and Sb correlate with Rn concentrations and are useful as tracers for air mass movements.
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