Intrusion of a branch of the Oyashio Current into the Japan Sea during the Holocene
Intrusion of a branch of the Oyashio Current into the Japan Sea during the Holocene
复制标题
全新世期间亲潮洋流的一个分支侵入日本海
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
Toshio Nakamura
中科院分区：
文献类型：
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作者：
T. Takei;K. Minoura;S. Tsukawaki;Toshio Nakamura
[1]利用有孔虫组合和从津格鲁海峡以西发现的两个活塞芯的稳定同位素记录，重建了日本海的全新世历史，总的目标是解决关于全新世期间进出日本海的争议。北部岩心的厚皮浮游有孔虫在8.3ka时由左盘曲变为右盘曲。然而，在南部岩芯，直到4.8ka之前，左旋回形式一直占主导地位。稳定同位素记录的某些指标在8.3和4.8ka时也发生了变化。这些结果表明，对马洋流在8.3ka开始流入日本海，但Oyashio洋流的一个分支一直流入到4.8ka。我们将8.3~4.8ka之间两股流的共存归因于斜压分量驱动的Tsugaru海峡浅部和深部之间的相反方向的流动。
[1] The Holocene history of the Japan Sea was reconstructed using foraminiferal assemblages and stable isotope records from two piston cores recovered from west of the Tsugaru Strait, with the overall goal to resolve a controversy regarding flow in and out of the Japan Sea during the Holocene. In the northern core the planktonic foraminifer N. pachyderma changed from left-coiling to right-coiling at 8.3 ka. However, in the southern core the left-coiling form remained dominant until 4.8 ka. Some indices of the stable isotopic records also changed at 8.3 and 4.8 ka. These results suggest that the Tsushima Current started to inflow into the Japan Sea at 8.3 ka, but a branch of the Oyashio Current continued to inflow until 4.8 ka. We attribute the coexistence of the two currents between 8.3 and 4.8 ka to the opposite direction flows between the shallow and the deep portions of the Tsugaru Strait driven by baroclinic components.