2010 Fiscal Year Final Research Report
Atmospheric radiocarbon variation during the past 50 ka by the high-resolution analysis of heaven lake sediment
| Project/Area Number |
20310007
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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 |
Environmental dynamic analysis
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| Research Institution | Nagoya University |
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Principal Investigator |
KITAGAWA Hiroyuki Nagoya University, 環境学研究科, 教授 (00234245)
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| Co-Investigator(Kenkyū-buntansha) |
TAKEMURA Keiji 京都大学, 理学(系)研究科(研究院), 教授 (00201608)
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| Co-Investigator(Renkei-kenkyūsha) |
WAN Hong Korea Institute of Geoscience and Mineral Resources (KIGAM), Professor
SOUTHEN John R. UCI KCCAMS Facility, Dr.
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| Project Period (FY) |
2008 – 2010
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| Keywords | 炭素14 / 天池 / 湖沼堆積物 / 炭素循環 / 編年 |
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| Research Abstract |
To investigate the ^<14>C variations in atmospheric CO_2 (^<14>CO_2) during the past 50 ka, we had a high-resolution analyses of the heaven lake sediments from Heilongjiang and Inner Mongolia, northeastern China. We focused on three subjects in this research ; (1) development of analytical methods for reading out climatic signals form the heaven lake sediments with a high-temporal resolution, (2) establishment of high-precision AMS ^<14>C measurements for small-size sample and enhancement of sample preparation throughput and (3) numerical model experiments for reconsidering the atmospheric ^<14>CO_2 changes and marine response on atmospheric changes for ^<14>CO_2.
We have developed the system of automatic UV-image analyze and laser-induced breakdown spectroscopy (LIBS) for sediment core analysis. Although we applied newly developed method to the heaven lake sediments, we need more experiments for detecting climatic signals. With a collaboration with UCI-KCCAMS (USA) and KIGAM (Korea), we developed an automatic preparation system for AMS ^<14>C measurement (for >0.3 mg C) and established a technique for extremely small samples (0.07～0.3 mg C). We are planning to apply these techniques developed to the other lake sediments. Finally we modified a global carbon cycle model, and discussed about the ^<14>C response of atmospheric ^<14>CO_2 changes on marine reservoir using the available data set.
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