2007 Fiscal Year Final Research Report Summary
HIGH RESOLUTIONAL RECONSTRUCTION OF TROPICAL ENVIRONMENTS AND EVALUATION OF LINKAGE BETWEEN HIGHLATITUDE ICEASHEETSAND LOALATITUDE ENVIRONMENTS
| Project/Area Number |
17253006
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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 | 海外学術 |
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| Research Field |
Geology
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| Research Institution | The University of Tokyo |
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Principal Investigator |
KAWAHATA Hodaka The University of Tokyo, Graduate School of Frontier Sciences, Professor (20356851)
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| Co-Investigator(Kenkyū-buntansha) |
YOKOYAMA Yusuke The University of Tokyo, GRADUATE SCHOOL OF SCIENCE, LECTURER (10359648)
SUZUKI Atsushi National Institute of Advanced Indestrial Science and Technology, INSTITUTE OF GEOLOGY AND GEOINFORMATION, RESEARCHER (60344199)
ODA Hirokuni The University of Tokyo, INSTITUTE OF GEOLOGY AND GEOINFORMATION, RESEARCHER (90356725)
OHKOUCHI Naohito JAMSTGEC, INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY, GROUP LEADER (00281832)
KIMOTO Katsunori JAMSTGEC, 地球内部変動研究センター, RESEARCHER (40359162)
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| Project Period (FY) |
2005 – 2007
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| Keywords | TROPICAL / HIGH LATITUDE / ICE SHEET / LOW LATITUTDE / ENVIRONMENTS / CORALS / IMAGES PROJECT / WESTERN EQUATLRIAL PACIFAC |
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| Research Abstract |
The equatorial western Pacific is characterized by the Western Pacific Warm Pool (WPWP) which has the highest open-ocean water temperatures in the world and a surface area of approximately 2.0×10^7 km^2 extending from 100°E to 180, the largest single expanse of warm water on our planet. This swath of ocean near New Guinea has a temperature consistently higher than 28℃, about 2 to 5℃ higher than that of other equatorial regions. The temperature and geographic extension of the WPWP fluctuate from year to year and have a relation with ENSO (El Nino - Southern Oscillation) events.
High resolution study from the modern to 220 kyr was conducted by using MD05-2970 obtained from Timor Sea to understand the evolution of the Australian monsoon since previous works proposed much lesser Australian monsoon during the ice ages. Our planktonic foraminiferal oxygen isotopic compositions range from -1.0 permil for the last glacial maximum to -2.8 permil for the Holocene which is consistent with the record previously reported from nearby locations. The present study showed the similar structures of oxygen isotopes between the penultimate glacial maximum and the last interglacial. However the oxygen isotope record obtained from the Makasser Strait indicated -1.0 permil and -4.0 permil respectively for the last two glacial maxima and the interglacials. Any discrepancies in the oxygen isotopes are attributable to changes in the oxygen isotopes of seawater due to the hydrological differences. These results shows that Austral summer monsoon was not as strong as today to create salinity differences between the two during the glacial times.
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[Journal Article] Distribution and temporal changes of lead in the surface seawater in the wester adjacent seas derived from coral skeletons2006
Author(s)
Inoue, M., Hata, A., Suzuki, A., Nohara, M., Sikazono, N., Wyss, Y., Hantro, W. S., Dong Kawahata, H.
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Journal Title
Environmental Pollution 144
Pages: 1045-1052
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Global iron connections between desert biogeochemistry and climate2005
Author(s)
Jickells, T., An, Z. S., Andersen, K. K., Baker, A. R., Bergametti, G, Brookes, N., Cao, J. J., Boyd R. A., Hunter, KA., Kawahata, H., Kubilay, N., LaRoche, J., Liss, P. S., Mahowald, N., Pr$ Ridgwekkm A. J., Tegen, I., Torres, R.
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Journal Title
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[Journal Article] Paleoenvironmental cnorthern area of the East China Sea during the past 42,000 years2005
Author(s)
Ijiri, A., Wang, L., Oba, T. Kawahata, H., Huang, C. Y., Huang, C. Y.
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Journal Title
Palaeogeography, Palaeoclimatology, Palaeoecology 219
Pages: 239-261
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Millennial-scale variations of sea-ice expsouthwestern part of the Okhotsk Sea during the past 120 kyr : Age model and ice-rafted debris Core MD01-24122005
Author(s)
Sakamoto, T., Ikehara, M., Uchida, M., Aoki, K., Shibata, Y., Kanamatsu, T., Harada, N., lijima Asahi, H., Takahashi, K, Sakai, H., Kawahata, H.
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Journal Title
Global and Planetary Change 53
Pages: 58-77
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Oxygen and $ isotope systematics in coral near its latitudinal limit : the coral response to low thermal stress2005
Author(s)
Omata, T., Suzuki, A., Kawahata, H. Nojima, S., Hata, A, Minoshima, K.
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Journal Title
Global and Planetary Change 53
Pages: 137-146
Description
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[Presentation] Winter temperature variations based on coral oxygen isotope record from Ishigaki Island, t$ Japan and transition of its dominant climate factor. with 1988/1989 climate regime s$2007
Author(s)
Tsunoda, T., Suzuki, A., Minoshima, K., Shikazono, N., Kawahata, H.
Organizer
Goldschmidt conference 2007
Place of Presentation
G
Year and Date
2007-08-23
Description
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