三陸沖海底コア（ＫＨ９４‐３，ＬＭ‐８）の解析に基づく過去９万年間の海洋環境変遷

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  • Paleoceanographic Change of the Sanriku Area during the Last 90,000 Years Based on the Analysis of a Sediment Core(KH94-3, LM-8).
  • サンリクオキ カイテイ コア KH94-3 LM-8 ノ カイセキ ニ モトヅク カコ 9マンネンカン ノ カイヨウ カンキョウ ヘンセン

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The occurrence of warm-water planktonic foraminifera, the δ18O of both benthic and planktonic foraminifera, and the total organic carbon content were measured for a sediment core (KH94-3, LM-8) collected from the continental slope off Sanriku area, on the east coast of Japan. The occurrence of warm-water planktonic foraminifera increased during the interglacial periods of the oxygen isotopic substage 51 and stage 1 and decreased during the glacial periods from the oxygen isotopic stage 4 to stage 2. This indicates that the core site was affected by the warm-water mass derived from the Kuroshio Current during the oxygen isotopic substage 51 and stage 1. The δ18O curve of benthic foraminifera shows a very similar pattern to the standard δ18O curve, but the δ18O curves of planktonic foraminifera are quite different from the standard curve. This suggests that the surface water condition at the core site has been changing over the last 90, 000 years. The total organic carbon content increased during oxygen isotopic stages 51, 2, and 1, suggesting possible increases in surface productivity during these periods. Based on comparison of the paleotemperatures calculated from the oxygen isotopic values in three piston cores which were retrieved off the east coast of Japan, it is suggested that the surface temperatures off Kashimanada and Sanriku decreased by 7.6°C and 4.4°C, respectively, during the last glacial maximum (LGM). Such large temperature drops are believed to be caused by the southward migration of the mixed water mass and the Oyashio Current into these area during the LGM.

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