2013 Fiscal Year Final Research Report
Reconstruction of long-term oceanic pH variability since the Industrial Revolution from chemical composition in corals around Ryukyu Islands
| Project/Area Number |
23740385
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | University of the Ryukyus |
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Principal Investigator |
ASAMI Ryuji 琉球大学, 理学部, 助教 (00400242)
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| Project Period (FY) |
2011 – 2013
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| Keywords | サンゴ / 骨格年輪 / 古環境 / 古海洋 / 化学組成 / 温暖化 / 海洋酸性化 |
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| Research Abstract |
Massive Porites corals from Ryukyu Islands and Guam Island were investigated to analyze long-term trend and variability of ocean environment in the northwestern Pacific Ocean. Analysis of X-ray images showed that the coral cores collected at Okinoerabu-jima, Ryukyu Islands, have continuous annual skeletal density bands for the last 450 years (A.D. 1560-2011). Stable isotope and trace element analyses of the coral skeleton generated high-resolution time series of ocean environment parameters such as seawater temperature, salinity, pH, etc, over the long term. Climate reconstruction using the proxy data suggests that sea surface waters in the tropical and subtropical northwestern Pacific Ocean possibly have become warmer, fresher, and more acid since the mid-20th century.
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[Journal Article] Inter-laboratory study for coral Sr/Ca and other element/Ca ratio measurements2013
Author(s)
Ed C. Hathorne, Alex Gagnon, Thomas Felis, Jess Adkins, Ryuji ASAMI, Wim Boer, Nicolas Caillon, David Case, Kim M. Cobb, Eric Douville, Peter deMenocal, Anton Eisenhauer, C. -Dieter Garbe-Sch6nberg, Walter Geibert, Steven Goldstein, Konrad Hughen, Mayuri Inoue, Hodaka Kawahata, Martin K611ing, Florence Le Cornec, Braddock K. Linsley, Helen V. McGregor, Paolo Montagna, Terrence M. Quinn, Jacek Raddatz, Laura Robinson, Aleksey Sadekov, Rob Sherrell, Dan Sinclair, Alexander W. Tudhope, Gangjian Wei, Henri Wong, Henry C. Wu, Chen-Feng You
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Journal Title
Geochemistry, Geophysics, Geosystems
Volume: 14
Pages: 3730-3750
DOI
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[Journal Article] Pronounced interannual variability in tropical South Pacific tenlperatures during Heinrich stadial 12012
Author(s)
T. Felis, U. Merkel, Ryuji ASAMI, P. Deschamps, E. C. Hathorne, M. Kolling, E. Bard, G. Cabioch, N. Durand, M. Prange, M. Schulz, S. Y. Cahyarini, and M. Pfeiffer
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Journal Title
Nature Communication
Volume: 3
Pages: 965
DOI
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[Presentation] Malcolm McCulloch : δ^<11>B, Sr, Mg and Ba in Acropora digitifera cultured under high-pCO_2 seawater : Effects of seawater pH on trace elenlent incorporation into coral aragonites2014
Author(s)
Kentaro Tanaka, Asami Takahashi, Michael Holcomb, Haruko Kurihara, Ryuji ASAMI, Ryuichi Shinjo, Kohki Sowa, Tsuyoshi Watanabe
Organizer
International Joint Workshop on Coral reef environnlental earth sciences
Place of Presentation
Sapporo, Japan
Year and Date
20140300
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