Paleoceanographic changes of surface and deep water based on oxygen and carbon isotope records during the last 130 kyr identified in MD179 cores,off Joetsu,Japan Sea |
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| Institution: | 1. Kanagawa Prefectural Museum of Natural History, Japan;2. Department of Earth and Planetary Environmental Science, University of Tokyo, Japan;3. Department of Earth and Environments, Graduate School of Science and Technology, Kumamoto University, Japan;1. Institute of Low Temperature Science, Hokkaido University, N19W8, Kita-ku, Sapporo, Hokkaido 080-0819, Japan;2. Birmingham Molecular Climatology Laboratory (BMC), School of Geography, Earth and Environmental Science, University of Birmingham, UK;3. Research Institute of Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan;4. Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University, N10W8, Kita-ku, Sapporo 060-0810, Japan;5. Organic Geochemistry Unit, Bristol Biogeochemistry Research Centre and The Cabot Institute, School of Chemistry, University of Bristol, Bristol BS8 1TS, UK;6. Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Nomi, Ishikawa, Japan;7. Graduate School/Faculty of Bioresources, Mie University, Tsu, Japan;8. Institute of Biogeosciences, JAMSTEC, Yokosuka, Japan;1. Department of Geodynamics and Sedimentology, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria;2. Department of Prehistoric and Historical Archaeology, University of Vienna, Franz-Klein-Gasse 1, A-1190 Vienna, Austria;3. Department of Palaeontology, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria;4. Geological Survey of Austria, Neulinggasse 38, A-1030 Vienna, Austria;5. Department of Geography, University of California Santa Barbara, 1832 Ellison Hall, Santa Barbara, CA 93106-4060, USA;1. Research Laboratory for Archaeology, University of Oxford, Dyson Perrins Building, South Parks Road, Oxford, OX1 3QY, UK;2. Department of Geography, Royal Holloway University of London, Egham, Surrey, TW20 0EX, UK;3. Department of Geography, The University of Manchester, Arthur Lewis Building, Oxford Road, Manchester, M13 9PL, UK;1. Department of Geography, College of Science, Swansea University, Swansea, UK;2. Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Denmark;3. Climate and Environmental Physics, Physics Institute, University of Bern, Switzerland |
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| Abstract: | We reconstructed the paleoenvironmental history of surface and deep water over the last 130 kyr from oxygen and carbon isotope ratios of planktonic and benthic foraminifera in two cores (MD179-3312 and MD179-3304) from the Joetsu Basin, eastern margin of the Japan Sea. Our data showed that paleoceanographic changes such as influx of surface currents and vertical circulation were associated with global glacial–interglacial sea level change. Surface water conditions were influenced by the influx of Tsushima Current, East China Sea coastal or off-shore waters through the Tsushima Strait during interglacial or interstadial stages, and strongly affected by freshwater input during the glacial maximum. During interglacial maximums such as Marine Isotope Stages 1 and 5e, development of well-oxygenated bottom water was indicated. A density-stratified ocean with weak ventilation was inferred from the isotopic records of benthic foraminifera during the Last Glacial Maximum. Local negative excursions in carbon isotopes during deglacial or interglacial periods may suggest the dissolution of gas hydrates or methane seep activities. |
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| Keywords: | Japan Sea Planktonic foraminifera Benthic foraminifera Stable isotopes Vertical circulation Gas hydrate |
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