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High-resolution records of thermocline in the Okinawa Trough since about 10000 aBP |
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| Authors: | Wang Jiliang SAITO Yoshiki OBA Tadamichi JIAN Zhimin WANG Pinxian |
| Institution: | 1. Laboratory of Marine Geology, MOE, Tongji University, Shanghai 200092, China 2. Geological Survey of Japan, Ibaraki 3058567, Japan 3. Department of Geoscience, Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan |
| Abstract: | The present paper uses planktonic foraminifera and their stable isotopes to study the changes in the depth of thermocline (DOT) in the Okinawa Trough since the last 10000 a based on the analysis of Core B-3GC in the northern Okinawa Trough, together with that of the core in the southern Okinawa Trough. As results show, the thermocline was shallow before 6400 aBP, and deepened afterward, then became shallow again from 4000 to 2000 aBP. The DOT fluctuations display a positive correlation with those of sea surface temperature (SST). In addition, the changes in the northern Okinawa Trough are similar to those in the southern trough, implying a possible connection with the variation of the Kuroshio Current. The changes of SST and DOT suggest that the Kuroshio Current changed its intensity or main axis from 4000 to 2000 aBP and around about 6400 aBP respectively. Moreover, the changes of DOT from 8200 to 6400 aBP may indicate a gradual intensification of the Kuroshio Current. |
| Keywords: | Okinawa Trough depth of thermocline (DOT) sea surface temperature (SST) Kuroshio Current planktonic foraminifera stable isotopes |
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