Sulfur isotopic view on the sources of sulfur in atmospheric fallout along the coast of the Sea of Japan

Historical changes in soil acidification inferred from the dendrochemistry of a Tateyama cedar at Bijodaira, Mt. Tateyama, Japan

“…These values are around 20 to 25 times those in Japan. At present, more than 50% of the deposition of nss-SO 4 2-in the Hokuriku district is estimated to be derived from the Asian continent (Ohizumi et al, 1997;Honoki et al, 2007). Therefore, we suggest that the increases in continentally derived acid deposition that started in the 1980s would have accelerated soil acidification and further increased the uptake of cations, such as Ca 2+ , into tree-rings at Bijodaira.…”

Contribution of Asian outflow to atmospheric concentrations of sulfate and trace elements in aerosols during winter in Japan

“…The δ 34 S of northern Chinese coal varies within a wide range, from approximately 0 to +30‰ (+6.6‰ on average; Hong et al, 1993;Maruyama et al, 2000). Also, Ohizumi et al (1997) reported the δ 34 S of SO 2 ranging from -8.2 to +7.2‰ (-3.3‰ on average) at 15 oil combustion facilities in Japan.…”

“…δ 34 S Asia and δ 34 S Japan were assumed to be equal to the average δ 34 S (+6.2‰) of nss SO 4 2-in the aerosol samples at A, D, G, and J (Fig. 3) and the average δ 34 S (-3.3‰) of SO 2 at Japanese oil combustion facilities (Ohizumi et al, 1997), respectively. The result yielded 88% as the average contribution of Asian outflow at the 10 sites (Table 3).…”

“…The sulfur isotope ratio (δ 34 S) of nss SO 4 2-was also measured and used to identify the sources of nss SO 4 2-in the aerosols. As an effective tracer, sulfur isotopes have been used for the source identification of nss SO 4 2-in precipitation or aerosol samples (Kitamura et al, 1993;Ohizumi et al, 1997;Akata et al, 2010;Sakata et al, 2013). In general, northern Chinese coals (approximately >30°N) have high δ 34 S values (+6.6‰ on average) compared with southern Chinese coals (-7‰ on average; Hong et al, 1993;Maruyama et al, 2000), probably indicating that the coal-forming environment is associated with fresh water.…”

Long-range transport of fluoride in East Asia monitored at Noto Peninsula, Japan

“…A dust particle consists of many kinds of minerals; some of them show anion-exchange activity. It has been reported that sulfur dioxide emitted from China is adsorbed on the surface of dust particles as sulfate in the atmosphere over the Japan Sea (Uno et al, 1997;Ohizumi et al, 1997). Asian Dust itself is an important source of fluoride.…”