2010 Fiscal Year Final Research Report
Reconstruction of changes in the atmospheric convection activity in the tropical Pacific Ocean during the last 150,000 years using hydrogen isotopes of biomarkers
| Project/Area Number |
19204051
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | Hokkaido University |
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Principal Investigator |
YAMAMOTO Masanobu Hokkaido University, 大学院・地球環境科学研究院, 准教授 (60332475)
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| Co-Investigator(Kenkyū-buntansha) |
IRINO Tomohisa 北海道大学, 大学院・地球環境科学研究院, 助教 (70332476)
SUGIMOTO Atsuko 北海道大学, 大学院・地球環境科学研究院, 教授 (50235892)
OKINO Tatsufumi 北海道大学, 大学院・地球環境科学研究院, 准教授 (30280910)
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| Project Period (FY) |
2007 – 2011
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| Keywords | 環境変動 / 気候変動 / 地質学 / 地球化学 |
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| Research Abstract |
We reconstructed the atmospheric convection activity in the tropical Pacific by analyzing biomarkers in marine cores retrieved from five locations in the tropical Pacific. Paleotemperature records demonstrated that the cold tongue shrunk, the western Pacific warm pool expanded, and zonal temperature gradient was relaxed during the last deglaciation. A deuterium record of fatty acids from the southern South China Sea disagrees with a published stalagmite record from northern Borneo. The latter is consistent with paleotemperature records, suggesting that zonal temperature gradient and the position of convection center has varied in response to precession.
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