| Project/Area Number |
21671001
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| Research Category |
Grant-in-Aid for Young Scientists (S)
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| Allocation Type | Single-year Grants |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | National Institute of Polar Research |
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Principal Investigator |
KAWAMURA Kenji 国立極地研究所, 研究教育系, 准教授 (90431478)
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| Co-Investigator(Kenkyū-buntansha) |
ABE Ayako 東京大学, 大気海洋研究所, 准教授
YOSHIMORI Masakazu 東京大学, 大気海洋研究所, 特任助教
SAITO Fuyuki 海洋研究開発機構, 研究員
NAKAZAWA Takakiyo 東北大学, 理学研究科, 教授
AOKI Shuji 東北大学, 理学研究科, 教授
MOTOYAMA Hideaki 国立極地研究所, 研究教育系, 教授
AZUMA Kumiko 国立極地研究所, 研究教育系, 准教授
HIRABAYASHI Motohiro 国立極地研究所, 研究教育系, 特任研究員
KOBASHI Takuro 国立極地研究所, 研究教育系, 外来研究員
SUZUKI Kazue 統計数理研究所, 研究員
UEMURA Ryu 琉球大学, 理学部, 准教授
SEVERINGHAUS Jeffrey P. 米国カリフォルニア大学サンディエゴ校, スクリップス海洋研究所, 教授
CHAPPELLAZ Jerome フランス氷河環境地球物理研究所, 上級研究員
PARRENIN Frederic フランス氷河環境地球物理研究所, 研究員
MAUREEN Raymo コロンビア大学, ラモント・ドーティー地球科学研究所, 教授
LISIECKI Lorraine カリフォルニア大学サンタバーバラ校, 助教
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| Project Period (FY) |
2009-05-11 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥107,900,000 (Direct Cost: ¥83,000,000、Indirect Cost: ¥24,900,000)
Fiscal Year 2013: ¥13,130,000 (Direct Cost: ¥10,100,000、Indirect Cost: ¥3,030,000)
Fiscal Year 2012: ¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
Fiscal Year 2011: ¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
Fiscal Year 2010: ¥21,190,000 (Direct Cost: ¥16,300,000、Indirect Cost: ¥4,890,000)
Fiscal Year 2009: ¥43,940,000 (Direct Cost: ¥33,800,000、Indirect Cost: ¥10,140,000)
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| Keywords | 環境変動 / 気候変動 / 南極氷床コア / 温室効果ガス / 物質循環 / 古気候 / 氷期・間氷期 / 氷床コア / ドームふじ / アイスコア / 氷期 |
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| Outline of Final Research Achievements |
We analyzed the Dome Fuji ice core from Antarctica for major greenhouse gases (CO_2, CH_4 and N_2O), as well as other gases including the concentrations of Kr and Xe that may be used as proxies for mean ocean temperature. In particular, we accurately dated the core with O_2/N_2 ratio, for the first time, and made advancement on understanding of the mechanisms of glacial-interglacial cycles by statistical test of termination timings and climate-ice sheet modeling. Our results show that the terminations are more closely related with precession than with obliquity. Moreover, for the past 400 kyr, the 100-kyr periodicity of glacial cycles was not primarily caused by CO_2 forcing, but it was caused by orbital forcing and resulting interactions within the Earth system (in particular, hysteresis response of north American ice sheet to climate, and interaction between ice sheet and bedrock). The reliability of Kr and Xe data were carefully confirmed by measuring several ice cores from both Antarctica and Greenland, and the variations of mean ocean temperature over the last glacial termination were reconstructed, for the first time, from these gases in the past atmosphere.
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| Assessment Rating |
Verification Result (Rating)
A
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