Paleoceanographic history around the Tsugaru Strait between the Japan Sea and the Northwest Pacific Ocean since 30 cal kyr BP
Paleoceanographic history around the Tsugaru Strait between the Japan Sea and the Northwest Pacific Ocean since 30 cal kyr BP
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DOI：
10.1016/j.palaeo.2005.09.003
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发表时间：
2006-03
期刊：
影响因子：
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通讯作者：
I. Koizumi;R. Tada;H. Narita;T. Irino;T. Aramaki;T. Oba;Hirofumi Yamamoto
中科院分区：
文献类型：
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作者：
I. Koizumi;R. Tada;H. Narita;T. Irino;T. Aramaki;T. Oba;Hirofumi Yamamoto
通过对6个活塞柱样中硅藻的生态和地理生境以及硅藻植物群的Q型因子分析，重建了津轻海峡30.0 cal kyr BP以来的古海洋历史。在30.0-17.5 cal kyr BP时，海平面下降和Oyashio海流的增强导致海峡东部地区海岸附近海底沉积物的侵蚀，并导致日本海第三和第二序列薄层层（TL 3和TL 2）的沉积。在17.5-11.5 cal kyr BP，海峡周围的冷却加剧，导致俄亥俄水通过海峡流入日本海。在15.5-14.5 cal kyr BP，海峡周围的冷水团从亚北极海冰发展到北极沃茨。在13.0-11.2 cal kyr BP，津轻海峡东部海洋冷水硅藻种类的增加清楚地记录了新仙女木期的冷却，而日本海没有。在15.5-13.0 cal kyr BP和11.25-10.25 cal kyr BP，新仙女木周围的变暖导致了海峡东部地区下北近海薄层的沉积。在9.5 cal kyr BP时，Oyashio海流水侵入Sanriku附近混合水域的深处。在9.5-7.0 cal kyr BP，日本海对马暖流系统强度开始了1.5-kyr间隔的波动。
The paleoceanographic history around the Tsugaru Strait since 30.0 cal kyr BP was reconstructed using ecological and biogeographical habitats of diatom species and Q-mode factor analysis of diatom flora in six piston cores. At 30.0–17.5 cal kyr BP, a fall in sea level and the intensification of the Oyashio Current caused erosion of submarine sediments near the shore in the eastern area of the Strait and led to deposition of the third and second sequences of thinly laminated layers (TL3 and TL2) in the Japan Sea. At 17.5–11.5 cal kyr BP, cooling intensified around the Strait, producing an inflow of Oyashio water into the Japan Sea through the Strait. At 15.5–14.5 cal kyr BP, a cold-water mass around the Strait developed from subarctic sea-ice to arctic waters. At 13.0–11.2 cal kyr BP, the Younger Dryas cooling was clearly recorded by the increasing of oceanic cold-water diatom species in the eastern area of the Tsugaru Strait but not in the Japan Sea. At 15.5–13.0 cal kyr BP and 11.25–10.25 cal kyr BP, the warming around the Younger Dryas resulted in the deposition of thinly laminated layers off Shimokita in the eastern area of the Strait. At 9.5 cal kyr BP, the Oyashio Current water intruded into deep depths in the mixed water region off Sanriku. At 9.5–7.0 cal kyr BP, the fluctuation of 1.5-kyr intervals in the strength of the Tsushima Warm Current system in the Japan Sea was initiated.