HR: 0800h
AN: OS31B-1441    [Abstracts]
TI: Tracking Indonesian Outflow Variability in the Timor Sea Over the Last 450 ky
AU: * Kuhnt, W
EM: wk@gpi.uni-kiel.de
AF: Department of Geosciences, Christian-Albrechts-University, Olshausenstr. 40, Kiel, D-24118 Germany
AU: Holbourn, A E
EM: ah@gpi.uni-kiel.de
AF: Department of Geosciences, Christian-Albrechts-University, Olshausenstr. 40, Kiel, D-24118 Germany
AU: Xu, J
EM: jx@gpi.uni-kiel.de
AF: Department of Geosciences, Christian-Albrechts-University, Olshausenstr. 40, Kiel, D-24118 Germany
AU: Kawamura, H
EM: hkawamura@nature.sci.hokudai.ac.jp
AF: COE Neo-Science of Natural History, Division of Biological Sciences, Graduate School of Science, Hokkaido University, North 10 West 8, Kita-ku, Sapporo, 060-0810, Japan
AU: Andersen, N
EM: nandersen@leibniz.uni-kiel.de
AF: Leibniz Laboratory for Radiometric Dating and Stable Isotope Research, Christian-Albrechts-University, Max-Eyth-Str. 11-13, Kiel, D-24118 Germany
AU: R”hl, U
EM: uroehl@rcom-bremen.de
AF: Center for Marine Environmental Sciences of Bremen University (MARUM), Leobener Str., Bremen, D - 28359 Germany
AB: Multi-proxy records (multispecies foraminiferal δ¹³C, δ¹⁸O, Mg/Ca, planktonic and benthic assemblages, X-ray fluorescence scanning and color reflectance data, TOC, chlorins and palynomorphs) from the easternmost Indian Ocean (IMAGES Cruise WEPAMA and Sonne Cruise 185 VITAL) allow to closely track changes in sea surface temperature, depth of thermocline, paleoproductivity and land-derived flux in the two main outflow passages of the Indonesian Throughflow. Spectral analysis of productivity and terrigenous flux proxies indicates spectral power concentrated in the 23 ky and 19 ky (precessional) and in the 100 ky (glacial-interglacial) periods. The phase relationships of productivity proxies, terrigenous flux, δ¹⁸O and austral summer insolation over the Australian continent suggest that local monsoonal wind patterns and vertical mixing of the upper ocean layer predominantly drive productivity on a precessional timescale. On a glacial-interglacial (100ky) timescale, sea-level related variations in Indonesian Throughflow intensity exert a major control on the thermocline structure in the Timor Sea. A centennial resolution study of Termination II reveals a two-stepped postglacial intensification of the Indonesian Throughflow: an initial increase in the outflow of warm surface water is followed by the onset of a modern-type outflow with a strong component of relatively cool low salinity thermocline waters.
DE: 1616 Climate variability (1635, 3305, 3309, 4215, 4513)
DE: 1641 Sea level change (1222, 1225, 4556)
DE: 4870 Stable isotopes (0454, 1041)
DE: 4910 Astronomical forcing
DE: 4954 Sea surface temperature
SC: Ocean Sciences [OS]
MN: Fall Meeting 2005