Seasonal Variation of Sulfur Isotope Ratios of Non-Sea Salt Sulfate in Wet Deposits in Northern Part of Japan

概要

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Sulfur isotope ratios of sulfate in wet deposits in northern part of Japan were determined to clarify the sources of sulfur. Wet deposits were collected evefy month from 1991 to 1996 at Yamagata, Shinjo, Yonezawa, Sakata, Okushiri Island, Rishiri Island, Ohfunato and Tagajo. Sulfur isotope ratios of sulfate in wet deposits were high in winter and low in summer and correlated to the contribution of sea salt sulfate. Sulfur isotope ratios of non-Sea slat sulfate showed seasonal variation with higher values in winter and agreed with the ones of sulfur oxides exhausted by Asian anthropogenic activities. The seasonal variation in sulfur isotope ratio of non-sea salt sulfate were classified into three different behaviors in the coast of Japan Sea Region, Inland Region and Pacific Coast Region. The coast of Japan Sea Region is characterized by high in average and widely dispersed values, Inland Region by narrowly dispersed ones, and Pacific Coast Region by low in average and widely dispersed ones.
山形大学の論文
1997-01-31