Dansgaard‐Oeschger (D‐O) climate instabilities that took place during Marine Isotope Stage 3 are connected to changes in ocean circulation patterns and sea ice cover. Here we explore in detail the configuration of the water column of the Denmark Strait during D‐O events 8–5. How the ocean currents and water masses within the Denmark Strait region responded and were connected to the North Atlantic are discussed. We investigate sediment core GS15‐198‐36CC, from the northern side of the Greenland‐Iceland Ridge, at 30‐year temporal resolution. Stable carbon and oxygen isotope reconstructions based on benthic foraminifera, together with a high‐resolution benthic foraminiferal record of Mg/Ca paleothermometry, is presented. The site was bathed by warm intermediate waters during stadials and cool but gradually warming intermediate water during interstadials. We suggest that stadial conditions in the Denmark Strait are characterized by a well‐stratified water column with a warm intermediate water mass that lies beneath a cold fresh body of water where sea ice and brine rejection work in consort to uphold the halocline conditions. Interstadial periods are not a pure replicate of modern times, but rather have two modes of operation, one similar to today, and the other incorporating a brief period of warm intermediate water and increased ventilation.

中文翻译：

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丹麦海峡溶解氧场间循环中中间水的高分辨率底栖 Mg/Ca 温度记录。

海洋同位素阶段 3 期间发生的 Dansgaard-Oeschger (D-O) 气候不稳定与海洋环流模式和海冰覆盖的变化有关。在这里，我们详细探讨 D-O 事件 8-5 期间丹麦海峡水柱的配置。讨论了丹麦海峡地区的洋流和水团如何响应以及如何与北大西洋相连。我们以 30 年时间分辨率研究了格陵兰岛-冰岛海岭北侧的沉积岩芯 GS15-198-36CC。提出了基于底栖有孔虫的稳定碳和氧同位素重建，以及 Mg/Ca 古测温的高分辨率底栖有孔虫记录。该场地在体育场期间被温暖的中间水沐浴，而在体育场间则被凉爽但逐渐变暖的中间水沐浴。我们认为，丹麦海峡的水位条件的特点是分层良好的水柱和温暖的中间水团，位于寒冷的淡水水体下方，海冰和盐水排斥共同作用以维持盐跃条件。间期并不是现代的纯粹复制，而是有两种运行模式，一种与今天类似，另一种则包含短暂的中间温水和加强通风。