Sediment core ARC5-ICE6 from the Makarov Basin was used to reconstruct circum-Arctic glaciation and surface-ocean circulation history for the Middle to Late Pleistocene, ∼0.5–0.7 Ma. Sedimentary proxies include elemental composition, coarse grain content, clay mineralogy, and radiogenic isotopes (Sr-Nd-Pb). Earlier studied records from the central Arctic Ocean were compared with ICE6 for a broader paleoceanographic context. Results indicate predominant sediment delivery from the Eurasian shelves and glaciated mainland with intermittent glacial inputs from North America. Low proxy variability prior to Marine Isotope Stage (MIS) 6 (∼0.2 Ma) suggests persistent sediment transport by sea ice via the Transpolar Drift and limited glaciation at the Eurasian margin. Since MIS 6, sediment inputs and provenance exhibit large shifts between glacial- and interglacial-type environments. The overall northern Eurasian Ice Sheet (EAIS) expansion was possibly related to climatic cooling and growth of a perennial sea ice in the Arctic Ocean. Provenance indicators from MIS 6, 5b and 4/3 reflect EAIS expansions followed by deglacial meltwater discharge from west Siberia. This provenance indicates a strong cyclonic circulation in the Arctic Ocean characterized by a significantly eastward-extended Transpolar Drift. Different glaciogenic sourcing and attendant circulation are proposed for several events within MIS 5 and 3, where proxies indicate increased sediment inputs from North America rather than Eurasian ice sheets. Overall limited glacial influence inferred for MIS 3 is consistent with relatively high sea level reconstructed for this interstadial. The Last Glacial Maximum is barely identifiable in the ICE6 record due to low glacial inputs and/or depositional hiatus.

来自马卡洛夫盆地的沉积物核心 ARC5-ICE6 用于重建中更新世至晚更新世约 0.5-0.7 Ma 的环北极冰川和地表海洋环流历史。沉积代理包括元素组成、粗粒含量、粘土矿物学和放射性同位素 (Sr-Nd-Pb)。早期研究的北冰洋中部记录与 ICE6 进行了比较，以获得更广泛的古海洋学背景。结果表明主要沉积物来自欧亚大陆架和冰川大陆，间歇性冰川输入来自北美。海洋同位素阶段 (MIS) 6 (∼0.2 Ma) 之前的低代理变异性表明，海冰通过跨极漂移和欧亚边缘有限的冰川作用进行持续的沉积物迁移。自 MIS 6 以来，沉积物输入和来源表现出冰川和间冰期环境之间的巨大变化。欧亚北部冰盖（EAIS）的整体扩张可能与气候变冷和北冰洋常年海冰的增长有关。来自 MIS 6、5b 和 4/3 的来源指标反映了 EAIS 的扩张，随后是西西伯利亚的冰川融水排放。这一起源表明北冰洋存在强烈的气旋环流，其特征是明显向东延伸的跨极漂移。为 MIS 5 和 3 中的几个事件提出了不同的冰川来源和伴随的循环，其中代理表明来自北美而不是欧亚冰盖的沉积物输入增加。为 MIS 3 推断出的总体有限的冰川影响与为该间质重建的相对较高的海平面一致。由于冰川输入和/或沉积中断，在 ICE6 记录中几乎无法识别末次冰期最大值。