Abstract
The results of analysis of the data collected on the concentrations of the ice-forming and other forms of nuclei in a few places in India (Delhi, Calcutta, Bombay, Lonavla and Poona) have been presented. The ice-forming nuclei have varied generally inversely with the chloride nuclei at Delhi, Bombay and Poona. The ice-forming and hygroscopic nuclei have shown negative correlation at Delhi. The ice-forming and non-hygroscopic nuclei have varied on parallel lines at Poona. The relatively large value of the ice-forming nuclei noticed at Delhi as compared to that at Calcutta has been seen reflected in the high value of the non-hygroscopic nuclei observed in that region. The observations have suggested that the main source for the ice-forming nuclei in the regions measured is the land. The possibility of the continental dust being responsible for the observed ice nuclei counts in the maritime air has been pointed out.
