| Budget Amount *help |
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2017: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2016: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2015: ¥10,010,000 (Direct Cost: ¥7,700,000、Indirect Cost: ¥2,310,000)
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| Outline of Final Research Achievements |
We analyzed trace elements and oxygen isotopes in fossil corals (Plesiastrea versipora and Porites sp.) from the time interval during MIS3 in Kikai Island. We found clear cyclic changes in interannual to decadal scales. Within the 22-year temperature records in Porites corals 55,000 years ago, the range of seasonal temperature variation dropped by half for 4 years. The cold (warm) water in summer (winter) could mainly reflect air temperature because we could not find same variation in oxygen isotopes of Tridacna shells. This drastic changes in air temperature could impact on the human life styles such as their food and habitability environment.
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