The spatial and temporal distributions of spheroidal carbonaceous particles from sediment core samples from industrial cities in Japan and China |
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| Authors: | Eri Hirakawa Akiko Murakami-Kitase Takamoto Okudaira Jun Inoue Hideo Yamazaki and Shusaku Yoshikawa |
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| Institution: | (1) Department of Geosciences, Osaka City University, 3-3-138 Sugimoto, Sumiyosi-ku, Osaka 558-8585, Japan;(2) Department of Resources and Environmental Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan;(3) Department of Life Science, Kindai University, 3-4-1 Kowakae, Higashi-Osaka 577-8502, Japan; |
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| Abstract: | Spheroidal carbonaceous particles (SCPs) are produced by the high-temperature combustion of fossil fuels and emitted in to
the atmosphere. The distribution and concentration of SCPs in sediments have been used as a proxy for the distribution of
pollutants emitted to the atmosphere. However, the effect on the distribution of SCPs due to industrial activity at nearby
industrial cities is yet to be quantified. To clarify the origin of SCPs of ~20 μm in size that are preserved in sediments,
we evaluated the abundance, surface morphology, and chemical composition of SCPs in sediment core samples recovered from industrial
cities in Japan (Tokyo, Osaka, and Nagasaki) and China (Beijing), with the cities being located at least ~500 km away from
each other. Vertical profiles of SCP concentration in sediment cores from the Japanese cities and Beijing are different, reflecting
the contrasting industrial histories of the two countries. The SCPs from different cities show contrasting morphological and
chemical characteristics, suggesting that ~20 μm SCPs in sediments from the industrial cities could represent the local combustion
history in detail, as the influx of local SCPs is dominant at such sites. |
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