2018 Fiscal Year Final Research Report

Glacial-interglacial changes in climate and environment studied by multi-parameter analyses of ice-core dust

Research Project

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Project/Area Number	15H01731
Research Category	Grant-in-Aid for Scientific Research (A)
Allocation Type	Single-year Grants
Section	一般
Research Field	Environmental dynamic analysis
Research Institution	National Institute of Polar Research
Principal Investigator	Goto-Azuma Kumiko 国立極地研究所, 研究教育系, 教授 (80202620)
Co-Investigator(Kenkyū-buntansha)	本山秀明国立極地研究所, 研究教育系, 教授 (20210099) 平林幹啓国立極地研究所, 研究教育系, 特任助手 (20399356) 永塚尚子国立極地研究所, 研究教育系, 研究員 (30733208) 櫻井俊光国立極地研究所, 研究教育系, 研究員 (00581810)
Project Period (FY)	2015-04-01 – 2018-03-31
Keywords	南極氷床コア / ダスト / マルチパラメータ / 氷期・間氷期 / 気候・環境変動
Outline of Final Research Achievements	We have developed cutting-edge techniques to perform multi-parameter analyses of mineral dust deposited onto the Antarctic ice sheet. Using these methods, we have analyzed mineral dust in Dome Fuji deep ice core. High resolution and accurate analyses using our CFA (Continuous Flow Analysis) system show that dust flux and CO2 concentration were highly correlated throughout the last deglacial period. Detailed analyses of the ion data suggest that continental gypsum might be an important source of non-sea-salt sulfate during cold glacial periods. We have found that dust originates from different sources during Holocene and that different elements show different ratios of particulate and soluble fractions of dust.
Free Research Field	雪氷学、古気候学
Academic Significance and Societal Importance of the Research Achievements	ダストは放射強制力に影響を及ぼすとともに、氷床・氷河や海氷上に堆積して雪氷面のアルベドを低下させ、融解を促進するため、気候・環境変動や海面変動と深い関わりを持っている。また、CO2濃度の変動とも深い関わりを持っていると考えられ、本研究で得られたダストの特性、動態、時間変動、CO2変動との関係に関する知見は、CO2の変動や気候変動のメカニズムの解明や将来予測の高精度化に大きく貢献することが期待される。