2011 Fiscal Year Final Research Report
Reconstructions of seasonality of sea surface temperature and salinity in the tropics during the last glacial maximum based on a fossil coral
| Project/Area Number |
21740387
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Geochemistry/Astrochemistry
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| Research Institution | The University of Tokyo |
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Principal Investigator |
INOUE Mayuri 東京大学, 大気海洋研究所, 助教 (20451891)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 最終氷期最盛期 / 化石サンゴ / 気候変動 / 熱帯域 / 微量元素 |
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| Research Abstract |
The magnitude of cooling of sea surface temperature(SST) during the last glacial maximum(LGM) in tropical to subtropical regions remains controversial. We conducted Sr/Ca andδ^<18> O measurements on a coral(Porites sp.) yielding a<230>^Th age of 22 ka that was retrieved from Vanuatu in the southwest Pacific. Our results indicated large, seasonal SST changes(~ 5℃), in particular, large cooling during the austral winter, at the LGM as compared to the present(<3℃). In addition, if the previously reported slight freshening around Vanuatu during the LGM is assumed, then a simple mathematical mass balance model indicates a decrease in the mean annual SST of 4. 5. 5℃.
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[Journal Article] Estimate of calcification responses to thermal and freshening stresses based on culture experiments with symbiotic and aposymbiotic primary polyps of a coral, Acropora digitifera.2012
Author(s)
M. Inoue, K. Shinmen, H. Kawahata, T. Nakamura, Y. Tanaka, A. Kato, C. Shinzato, A. Iguchi, H. Kan, A. Suzuki, K. Sakai
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Journal Title
Global and Planetary Change
Volume: (in press)
Peer Reviewed
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