Study on Dry Fallout and Its Distribution of Giant Sea-Salt Nuclei in Japan

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Abstract
Weight-number distribution of giant salt nuclei which fell to the ground in Kyoto was determined every night from Jan. 4 to Feb. 3, 1962. Similar observations were also made at the same time at several stations along a transversal cross-section of Japan in the direction of the winter monsoon, at a few nights in the above period. From analysis of the data, it was concluded that giant salt nuclei in the atmosphere are primarily produced from the sea surface through an air-sea boundary process, and carried over the land by wind, as predicted by Toba (1961) based on studies of a model system utilizing a wind flume. The weight-number distribution curve, however, varied day by day and it is suggested that the accumulation of data concerning sea-salt nuclei distribution may afford some clue for further understanding of the precipitation mechanism. Rate of the total dry fallout of sea-salt was also calculated from the above data. It was between 3.10-12-2.10-14gm cm-2 sec-1.