Environmental changes in Syowa Station area of Antarctica during the last 2300 years inferred from organic components in lake sediment cores
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概要
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rganic components in sediment cores from Namazu Ike(lake)(length 40cm) and O-ike(lake)(length 32cm) from Syowa Station area, Antarctica were studied to clarify their features in relation to paleoenvironmental changes, together with carbon-14 dating by Tandetron accelerator mass spectrometry. Namazu Ike sediment core was mainly composed of algal(mainly cyanobacteria) and aquatic moss debris, whereas O-ike sediment core was comprised of coarse and fine sands with the influence of algal(mainly cyanobacteria) debris. The ages of core bottoms of Namazu Ike and O-ike were estimated to be 1550 and 2330 years before present(yBP), respectively. The sedimentation rates of Namazu Ike and O-ike were calculated to be 30 and 59 years/cm, respectively. Very high total organic carbon(TOC) contents(average 24.5%) of Namazu Ike revealed that the sediment core was mainly composed of organic matter. Dramatic increase of TOC/total nitrogen ratios at a depth of 25cm in Namazu Ike strongly suggests that aquatic moss increased from 1100yBP to the core top. Changes in n-alkanes, n-alkanoic and n-alkenoic acids, and sterol compositions in the O-ike sediment core, suggest that microbial composition changed considerably, but their source organisms are not clear and further studies are required.
- 国立極地研究所の論文
著者
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Kanda Hiroshi
National Institute of Polar Research, Midori-cho, Tachikawa, Tokyo 190-8518, Japan.
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Imura Satoshi
National Institute of Polar Research
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TAKEMURA TETSUO
Department of Chemistry, Faculty of Sciences, Science University of Tokyo
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Kanda Hiroshi
National Institute Of Polar Research
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OHYAMA Yoshikuni
National Institute of Polar Research
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MATSUMOTO Genki
Department of Environmental Information Science, School of Social Information Studies, Otsuma Women'
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Imura Satoshi
National Inst. Polar Res. Tokyo
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Komori Kazushi
Department of Chemistry, Faculty of Science, Tokyo University of Science
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Enomoto Ayaka
Department of Environmental Information Science, School of Social Information Studies, Otsuma Women'
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Enomoto Ayaka
Department Of Environmental Information Science School Of Social Information Studies Otsuma Women&ap
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Komori Kazushi
Department Of Chemistry Faculty Of Science Tokyo University Of Science
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Takemura Tetsuo
Department Of Chemistry Faculty Of Science Tokyo University Of Science
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Takemura Tetsuo
Department Of Applied Physics Faculty Of Engineering Kyushu University
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Matsumoto Genki
Department Of Chemistry College Of Arts And Sciences University Of Tokyo
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Matsumoto Genki
Department Of Environmental Information Science School Of Social Information Studies Otsuma Women&ap
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Kanda Hiroshi
National Aerospace Laboratory
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