| Project/Area Number |
16340157
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Osaka City University |
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Principal Investigator |
YOSHIKAWA Shusaku Osaka City University, Faculty of Science, Professor, 大学院理学研究科, 教授 (30047394)
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| Co-Investigator(Kenkyū-buntansha) |
MITAMURA Muneki Osaka City University, Faculty of Science, Associate Professor, 大学院理学研究科, 助教授 (00183632)
CHO Chul-jae Osaka City Cultural Properties Association, Research Department for Cultural Properties, Chief of Reseach data subsection, 調査研究部, 資料係長 (20344369)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥14,000,000 (Direct Cost: ¥14,000,000)
Fiscal Year 2006: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2005: ¥8,200,000 (Direct Cost: ¥8,200,000)
Fiscal Year 2004: ¥4,600,000 (Direct Cost: ¥4,600,000)
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| Keywords | charcoal / spheroidal carbonaceous particles / biomass burning / fossil fuel combustion / Holoccene / Osaka Plain / 上部更新統 / 大阪体積盆地 |
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| Research Abstract |
Natural and anthropogenic combustion processes mobilize a large variety of materials about the environment. In this study, macroscopic and microscopic charcoal particles, and spheroidal carbonaceous particles (SCPs) in the latest Pleistocene and Holocene sediments of the Osaka Plain, central Japan, were studied. Charcoal particles are generated through biomass burning. SCPs are formed from incomplete high temperature combustion of fossil fuels.
Based on the charcoal stratigraphy of the latest Pleistocene and Holocene sediments, the last 12ka is divided into three periods : 12 ka to 9 ka, 9 ka to 2 ka and since 2 ka. Charcoal abundance increased from about 12 ka, and the highest abundance of charcoal between 11 ka and 9 ka was associated with the ancient human activities. After 9ka, charcoal abundance decreased and increased gradually from 2 ka to present. Conquently, charcoal abundance evidence in the sediments suggests that variation of biomass fire frequency in the Osaka Plain was affected by ancient human activities.
SCPs concentration in the latest Holocene sediments increased in the early 1930s. After that SCPs concentration increased rapidly in 1950s and decreased from 1970s to present. These trends can ascribed to the growth of industial activities and the regulation of atomospheric pollutant emission, respectively.
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