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首页> 外文期刊>Paleoceanography >Paleo-ocean Destratification Triggered by the Subduction of the Oyashio Water Into the Sea of Japan After the Last Glacial Maximum
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Paleo-ocean Destratification Triggered by the Subduction of the Oyashio Water Into the Sea of Japan After the Last Glacial Maximum

机译：古海荒民主党在最后的冰川最大冰川后涂抹在日本海洋中的拍摄

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摘要

The Sea of Japan was strongly stratified during the Last Glacial Maximum due to constant freshwater supply. We developed a multilayer box model to investigate paleo-oceanic dynamics that led to destratification triggered by the subduction of dense Oyashio water from the Tsugaru Strait. The Oyashio water subducted into the intermediate layer, which made the upper layer more saline through upwelling and vertical diffusion of saline seawater, thus weakening the stratification by salinity within the upper layer. This salinity also maintained the deep convection process triggered by sea ice formation during successive winters by increasing the surface salinity, and hence, density, of the upper layer. The bottom layer increased in thickness due to the persistent deep convection, thus gradually moving the subduction depth of the saline Oyashio water upward. This process accelerated the salinity increase in the upper layer, resulting in the rapid destratification and cessation of benthic hypoxia on a millennium timescale after the Last Glacial Maximum, even without considering sea level increase. Our model suggests the significance of the combination of Oyashio water subduction and deep convection in the paleo-oceanic dynamics of the Sea of Japan. It is concluded that both the subduction of saline Oyashio water from the Tsugaru Strait and deep convection are necessary to explain the destratification of the water column during deglaciation.
机译：由于持续的淡水供应，日本海在最后一次冰川盛期具有强烈的分层。我们开发了一个多层箱模型来研究古海洋动力学，该动力学导致了致密的Oyashio水从Tsugaru海峡俯冲而引发的破坏。Oyashio水俯冲到中间层，通过盐水的上升流和垂直扩散，使上层更咸，从而通过上层内的盐度削弱分层。这种盐度还通过增加表层盐度，从而增加上层密度，维持了连续冬季海冰形成引发的深度对流过程。由于持续的深对流，底层厚度增加，从而逐渐向上移动盐碱Oyashio水的俯冲深度。这一过程加速了上层盐度的增加，导致在末次冰期最大值之后的千年时间尺度上，即使不考虑海平面上升，底栖缺氧也会迅速破坏和停止。我们的模型表明，在日本海的古海洋动力学中，Oyashio水俯冲和深对流的组合具有重要意义。结论是，来自Tsugaru海峡的盐水Oyashio的俯冲和深对流都是解释冰消期间水柱破坏的必要条件。

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