Pleistocene deep-sea ostracods from the Oki Ridge, Sea of Japan (IODP Site U1426) and condition of the intermediate water
Pleistocene deep-sea ostracods from the Oki Ridge, Sea of Japan (IODP Site U1426) and condition of the intermediate water
复制标题
日本海隐木海岭的更新世深海介形类（IODP Site U1426）和中间水的状况
DOI：
10.1017/qua.2017.68
复制
发表时间：
2017
影响因子：
2.3
通讯作者：
Motoyama Isao
中科院分区：
文献类型：
--
作者：
Yamaguchi Tatsuhiko;Kuroki Kentaro;Yamada Katsura;Itaki Takuya;Niino Kaoru;Motoyama Isao
日本海（也称为东海）有一个与太平洋和东海隔离的环流系统。东亚冬季风驱动环流系统，冷却对马暖流（TWC），形成日本海中间适当水（JSIPW）。中层水将氧气输送到深海海底，供底栖动物使用。上新世（3.5- 2.8Ma），在弱冬季风的作用下，形成了温带中层水（TIW），并发现了已灭绝的介形类TIW类群，但对早更新世中层水和底栖介形类灭绝模式的研究还很少。我们研究了日本海综合大洋钻探计划U1426站点2.0和1.3 Ma（海洋氧同位素阶段[MIS] 77至MIS 41）深海沉积物中的放射虫和介形类。介形类动物群包括TIW和JSIPW类群。放射虫亚热带水类群和JSIPW介形类表明TWC和JSIPW的小流入。TIW偶尔扩展到中半深海区。通过与冬季风和现代JSIPW的关系类比，弱的冬季风可能导致了温和的水柱温度梯度和TIW的扩张。JSIPW类群在间冰期期间将其范围扩展到深海。
The Sea of Japan (also termed the East Sea) has a circulation system isolated from the Pacific Ocean and East China Sea. The East Asian winter monsoon drives the circulation system and cools the Tsushima Warm Current (TWC) to form the Japan Sea Intermediate–Proper Water (JSIPW). The intermediate water conveys oxygen to deep-sea floors, which is available for benthic animals. During the Pliocene (3.5–2.8 Ma), Temperate Intermediate Water (TIW) was formed under the weak winter monsoon, and extinct ostracod TIW taxa were found. Little is known about early Pleistocene intermediate water and the extinction mode of benthic ostracods. We studied radiolarians and ostracods from deep-sea sediments between 2.0 and 1.3 Ma (Marine Oxygen Isotope Stage [MIS] 77 to MIS 41) at Integrated Ocean Drilling Program Site U1426, Sea of Japan. The ostracod faunas contained TIW and JSIPW taxa. The radiolarian subtropical-water taxa and the JSIPW ostracods indicate a small influx of the TWC and the JSIPW. The TIW occasionally expanded to the middle bathyal zone. By analogy with the relationship between the modern JSIPW and winter monsoon, weak winter monsoon possibly caused gentle temperature gradients in the water column and the expansion of the TIW. The JSIPW taxa expanded their ranges into the deep sea during interglacial periods.