| Budget Amount *help |
¥39,000,000 (Direct Cost: ¥30,000,000、Indirect Cost: ¥9,000,000)
Fiscal Year 2014: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2012: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2011: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
Fiscal Year 2010: ¥24,440,000 (Direct Cost: ¥18,800,000、Indirect Cost: ¥5,640,000)
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| Outline of Final Research Achievements |
We studied the evolution of NADW (North Atlantic Deep Water) during the intensification of Northern Hemisphere glaciation using a newly developed rock-magnetic method to determine the constituent magnetic minerals of sediments. We measured isothermal remanence acquisition curves of deep-sea sediments drilled in the North Atlantic and decomposed the first derivatives of these curves into high-coercivity and low-coercivity components. Fractional changes of the high-coercivity component represent variation of the NADW formed at the Nordic Seas. The high-coercivity component increased significantly during an interglacial period just after ~2.68 Ma, which suggests that NADW formation in the Nordic Seas abruptly intensified at this time. In addition, millennial-scale variation in the NADW was observed associated with the Ice rafted debris (IRD) events, repeatedly occurred in glacial period.
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