Ice core dating by the use of seasonal change of chemical elements concentration
| Project/Area Number |
06453206
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Nagoya University |
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Principal Investigator |
NAKAWO Masayoshi Nagoya University, Institute for Hydrospheric-Atmospheric Sciences, Associate Professor, 大気水圏科学研究所, 助教授 (90142695)
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| Co-Investigator(Kenkyū-buntansha) |
AZUMA Kumiko Nagaoka Institute of Snow & Ice Studies, National Research Institute for Earth S, 長岡雪氷防災実験研究所, 主任研究官 (80202620)
SEKO Katsumoto Nagoya University, Institute for Hydrospheric-Atmospheric Sciences, Research Ass, 大気水圏科学研究所, 助手 (70196971)
YOSHIDA Naohiro Nagoya University, Institute for Hydrospheric-Atmospheric Sciences, Associate Pr, 大気水圏科学研究所, 助教授 (60174942)
OHTA Keiichi Nagoya University, Institute for Hydrospheric-Atmospheric Sciences, Associate Pr, 大気水圏科学研究所, 助教授 (80022250)
AGETA Yutaka Nagoya University, Institute for Hydrospheric-Atmospheric Sciences, Professor, 大気水圏科学研究所, 教授 (80091164)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥4,600,000 (Direct Cost: ¥4,600,000)
Fiscal Year 1995: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1994: ¥3,200,000 (Direct Cost: ¥3,200,000)
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| Keywords | ice core / dating / chemical elements / seasonal change / snow metamorphism / 年代推定 / 化学物質濃度 / 安定同位体 / 結晶粒径 |
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| Research Abstract |
In 1995, the time evolution of the concentration of various chemical elements has beem observed with series of samples taken from a snow pack in a period of mid-winter to early spring at Saiho, Niigata Prefecture, Japan. In this observation, it was found that the concentration of the chemical elements such as ion concentration, particle concentration and isotope ratio has been preserved within the snow pack even with the wet metamorphism of snow after the snow melting season started.
In 1996, Vartical profiles for these elements have been analyzed with ice cores retrieved at Antarctic, Arctic and Asian highland regions. The dating of the cores has been tried by counting the annual cycle of the concentration of these elements, and compared with the dating results made by the other methods. It was found that the counting method would provide reasonable age for both the polar cores which has experienced no melting and Asian highland cores which has been subjected to summer melting. It is concluded that counting annual layrs is a useful tool to date ice cores either from polar or non-polar regions.
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Report
(3 results)
Research Products
(5 results)
