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Sr Isotopic Signature in Plant-Derived Ca in Rain |
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| Authors: | Takanori Nakano Seo-Ryong Jeon Junko Shindo Tamon Fumoto Naoki Okada Jun Shimada |
| Affiliation: | 1. Institute of Geoscience, University of Tsukuba, Tsukuba, Ibaraki, 305-8571, Japan 2. National Institute of Agro-Environmental Sciences, Tsukuba, Ibaraki, 305-8604, Japan 3. Forestry and Forestry Products Research Institute, Kukisaki, Ibaraki, 305-8687, Japan 4. Department of Earth Science, Kumamoto University, Kumamoto, Kumamoto, 860-8555, Japan |
| Abstract: | The 87Sr/86Sr ratios in rain at three sites in Japan were about 0.706 to 0.712, whereas those at one site in central Korea were higher (0.711 to 0.716), reflecting the difference in geology between the two countries. Because the 87Sr/86Sr ratios of exchangeable sites in soil minerals are indistinguishable from those of associated plants, aerosol Sr originating from both can be grouped together as plant-derived Sr. Spatial and temporal variations in 87Sr/86Sr and Sr/Ca ratios in the rain suggest the presence of plant-derived Sr and Ca in addition to Sr and Ca derived from sea-salt, acid-soluble aeolian carbonate from China, and cement-derived carbonate. However, systematic data on the 87Sr/86Sr ratios and elemental concentrations of soils, plants, fly-ash, and road dust are required to put reliable constraints on the provenance of atmospheric Ca. |
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