2009 Fiscal Year Final Research Report
Reconstruction of variation of East Antarctic ice sheet and Antarctic Circumpolar Current during the Quaternary
| Project/Area Number |
19340156
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | Kochi University |
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Principal Investigator |
IKEHARA Minoru Kochi University, 教育研究部自然科学系, 准教授 (90335919)
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| Co-Investigator(Kenkyū-buntansha) |
MURAYAMA Masafumi 高知大学, 教育研究部自然科学系, 准教授 (50261350)
KODAMA Kazuto 高知大学, 教育研究部自然科学系, 教授 (00153560)
MIURA Hideki 国立極地研究所, 教育研究系, 助教 (10271496)
NAKAMURA Yasuyuki 東京大学, 海洋研究所, 助教 (60345056)
KAWAGATA Syungo 横浜国立大学, 教育人間科学部, 准教授 (90244219)
IWAI Masao 高知大学, 教育研究部自然科学系, 准教授 (90274357)
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| Project Period (FY) |
2007 – 2009
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| Keywords | 南大洋 / 海洋コア / 東南極氷床 / 南極環流 / 第四紀 / 生物生産量 / 海氷 / 地震波探査 |
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| Research Abstract |
The marine core LHB-3PC off Lutzow-Holm Bay, East Antarctica, provides new paleoceanographic records over the past 730 kyrs. Marine productivity was significantly restricted during the glacial periods. The earlier period, between 730 kyr and 430 kyr ago, was characterized by less biological production in the Antarctic surface water in interglacial periods. The transition from glacial to interglacial conditions about 430 kyr ago resembles the transition into the present interglacial period in terms of the magnitude of change in global climate. The distinct climate transition corresponds to the mid-Brunhes event (MBE). Before the MBE, it seem that the Antarctic Ocean was covered by perennial sea ice in interglacial periods. Based on the bathymetric mapping, subbottom profiling, and multi-channel seismic reflection survey, a dune-like bedform (mudwave) exists on the southwest slope of the Conrad Rise. Lithology of core COR-1PC is diatom ooze, and sedimentation rate is very high up to about 40 cm/ka. Thus, the sediment drift was deposited with mudwaves on the Conrad Rise, which was developed by influences of Antarctic Circumpolar Current (ACC).
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Research Products
(22 results)
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[Presentation] Productivity changes in the Southern Ocean during the past 650 kyrs2009
Author(s)
Ikehara, M., B.K. Khim, S. Okamoto, M. Kobayashi, K. Katsuki, Y. Suganuma, M. Yamane, Y. Yokoyama
Organizer
Korea-Japan Jointed Workshop on Paleoceanography: Global Processes and Variability
Place of Presentation
Jeju National University, Jeju City, Korea
Year and Date
20090424-20090425
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[Presentation] Late Quaternary Paleoceanographic Changes over the Conrad Rise and off LUtzow-Holm Bay in the Indian Sector of the Southern Ocean2008
Author(s)
Ikehara, M., Khim, B. -K., Nakamura, Y., Nogi, Y., Katsuki, K., Suganuma, Y., Kameo, K., Miura, H., Yokoyama, Y., Kawamura, S., Kita, S.
Organizer
AGU Fall Meeting
Place of Presentation
San Francisco
Year and Date
20081215-20081219
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