As an important hydrological parameter in the upper ocean, the depth of the thermocline (DOT) in the Okinawa Trough (OT) is closely linked to air‐sea interactions and Kuroshio Current (KC) intrusions. However, high‐resolution DOT records in the OT since the last deglaciation have not been well reconstructed. In this study, we generated surface ( ) and shallow subsurface ( ) temperature records from core M063‐05, obtained from the middle OT, and reconstructed annual mean DOT variations since the last deglaciation based on vertical temperature gradients (ΔT ). The DOT variations in the OT are interpreted to be mainly driven by the KC, with a stronger KC resulting in a deeper DOT and a smaller ΔT ( ). In our reconstruction, the KC intensity increased gradually during the last deglaciation, with a reduction during the Younger Dryas, reached a maximum in the early Holocene, and then gradually declined during the middle to late Holocene. We also investigated the responses of the KC to high‐ and low‐latitude climate systems. On orbital timescales, the evolution of the KC occurred in parallel to precession‐induced El Niño‐Southern Oscillation (ENSO) dynamics. On millennial timescales, fluctuations in the intensity of the KC during the last deglaciation suggest a dynamic link to the North Atlantic climate via the East Asian Monsoon. We propose that the ΔT between ‐ and ‐based temperatures is a reliable indicator for high‐resolution studies on the hydrographic structure of the OT and paleoceanographic evolution in the East China Sea.

中文翻译：

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冲绳海槽中部成对的有机古温计对自上次冰消以来黑潮当前演变的新见解

作为上层海洋的重要水文参数，冲绳海槽（OT）中的温跃层（DOT）的深度与海-海相互作用和黑潮（KC）侵入密切相关。但是，自上次冰消以来，OT中的高分辨率DOT记录尚未得到很好的重建。在本研究中，我们从中部OT获得了M063-05核心的表面（ ）和浅层次（ ）温度记录，并根据垂直温度梯度（ΔT ）重建了自上次冰消以来的DOT年平均变化。OT中DOT的变化主要是由KC驱动的，KC越强，DOT越深，ΔT越小（ ）。在我们的重建中，KC强度在最后一次冰消期间逐渐增加，而在Younger Dryas期间减小，在全新世早期达到最大值，然后在全新世中后期逐渐降低。我们还研究了KC对高纬度和低纬度气候系统的响应。在轨道时标上，KC的演化与岁差引起的厄尔尼诺-南方涛动（ENSO）动力学平行发生。在千禧年尺度上，最后一次冰消期间KC强度的波动表明通过东亚季风与北大西洋气候之间存在动态联系。我们建议‐和之间的ΔT基于温度的温度是对东海海域旧时水文结构和古海洋演化进行高分辨率研究的可靠指标。