2005 Fiscal Year Final Research Report Summary
High resolution reconstruction of paleoclimate around the Japanese alpine area based on lake sediments analyses
| Project/Area Number |
15340168
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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 | Shinshu University |
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Principal Investigator |
KUMON Fujio Shinshu University, Fac.Science, Dept.Environmental Sciences, Professor, 理学部, 教授 (60161717)
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| Co-Investigator(Kenkyū-buntansha) |
MIYAKE Yasuyuki Shinshu University, Fac.Science, Dept.Geology, Professor, 理学部, 教授 (70200144)
FUKUSHIMA Kazuo Shinshu University, Fac.Science, Dept.Environmental Sciences, Professor, 理学部, 教授 (20106602)
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| Project Period (FY) |
2003 – 2005
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| Keywords | Paleoclimate / Takano Formation / total organic carbon / glacial age / Lake Nojiri / pollen analysis / marker tephra / MIS 5 |
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| Research Abstract |
The paleoclimate during the last 60,000 years have been reconstructed in detail, based on the drilled lake sediments from Lake Nojiri. Total organic carbon (TOC) and total nitrogen (TN) are used as new excellent proxies of paleoclimate as well as pollen analysis data. These data have about 50 years interval in average, and can provide one of standard climate changes around East Asia in the Last Glacial and Post-glacial periods.
The drilled sediments of Takano Formation in Nagano City, 54.5 meters long, is composed of homogenous silty clay, and are intercalated with many tephra layers. Radiometric ages of several wide-spread marker tephras offers keys of age estimation of sediments. TOC and TN contents are measured in 1cm interval, about 26 years average. The vertical profile of TOC and TN contents varies concordantly with marine ^<18>O isotope curve and also with ^<18>O isotope curve of Greenland ice cores from 160,000 years to 40,000 years age. This result is the first detailed reconstruction of paleoclimate of Japanese land area.
These reconstructions are one of best paleoclimate data in and around Japan in time resolution and long coverage. These data can be a standard of paleoclimate in Japan, because they can be correlated with other areas by the means of marker tephra.
On the other hand, we have tried to clarify the process how TOC and TN contents in lake sediments reflect climate change. The modern relationship among TOC contents in sediment, biological productivity of lake water and weather factors in Lake Kizaki, central Japan were examined from 1982 to 2002. The study have revealed that winter temperature which means duration of cold season, control annual biological productivity in lake water, resulting in the amount of accumulated organic matters.
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[Journal Article] Estimation of source and inflow of dioxins and poly-cyclic aromatic hydrocarbon from the sediment core of Lake Suwa, Japan.2005
Author(s)
Ikenaka, Y., Eun, H., Watanabe, E., Kumon, F., Miyabara, Y
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Journal Title
Environmental Pollution 138
Pages: 530-538
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Relationships among weather factors, biological productivity and TOC contents of sediments in Lake Kizaki, central Japan.2005
Author(s)
Kumon, F., Kanamaru, K., Tawara, T., Kakuta, N., Yamamoto, M., Hayashi, H.
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Journal Title
Jour.Geol.Soc.Japan (in Japanese with English abstract) 111(10)
Pages: 599-609
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Characteristics of bottom surface sediments in relation to wind and wave action in Lake Kitaura, central Japan.2004
Author(s)
Naya, T., Amano, K., Okada, M., Nakazato, R., Kumon, F., Nirei, H.
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Journal Title
Jour.Geol.Soc.Japan 110
Pages: 1-10
Description
「研究成果報告書概要(欧文)」より
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[Book] 堆積物と堆積岩2004
Author(s)
保柳康一, 公文富士夫, 松田博貴
Total Pages
171
Publisher
共立出版
Description
「研究成果報告書概要(和文)」より
