Diatom abundance and species distribution present a subtle tool for the reconstruction of the orbital and millennial-centennial climate and environmental changes in the southwestern Bering Sea during the last 172 ka, in addition to productivity proxies (chlorine, color b*, and Ca/Ti ratio), magnetic susceptibility, and biomarker proxies derived earlier and in this paper from the sediment core SO201-2-85KL recovered at the middle Shirshov Ridge (MSR). Available data indicate that the MSR area undergoes a significant seasonal sea ice influence during cold MISs 6.5–2. During the colder MIS 2, a main area of ice discharge extended southward of the MSR, likely outside of the sea, while over the coldest MIS 6.2, the MSR area was free from ice due to the shifting of the Aleutian Low to the eastern Siberian coast and the northward transfer of the warm and wet air of storm tracks into the western Bering Sea. During the warm MIS 5.5, the sea ice influence at the MSR area was negligible, nearly the same as it was over the Holocene, and it began to increase after event 26 (120.5 ka). The millennial scale variability of diatom abundance and its species distribution were triggered by Greenland Interstadials accompanied by productivity changes. The diatom species distribution showed complicated pattern of variability of the MSR environment, consistent with the millennial-centennial changes of the Greenland air temperature over the Dansgaard -Oeschger cycles. It confirms the rapid mechanisms of atmospheric teleconnection between these remote regions on the millennial-centennial time scale.

硅藻的丰度和物种分布为重建白令海西南172 ka期间的轨道和千年百年气候与环境变化提供了一个微妙的工具，此外还具有生产力指标（氯，颜色b *和Ca / Ti）比值，磁化率和生物标记物替代物，是早先和本文中从Shirshov Ridge（MSR）中部回收的沉积物芯SO201-2-85KL获得的。现有数据表明，在冷MIS 6.5–2期间，MSR地区受到明显的季节性海冰影响。在MIS 2较冷期间，主要的冰排放区域向MSR南部延伸，可能在海面之外，而在最冷的MIS 6.2上方，由于阿留申低地向西伯利亚东部海岸转移以及风暴径的湿热空气向北转移到白令海西部，MSR地区没有冰。在温暖的MIS 5.5期间，MSR地区的海冰影响可以忽略不计，几乎与全新世相同，在事件26（120.5 ka）之后开始增加。硅藻丰度及其物种分布的千年尺度变化是由格陵兰间质伴随生产力变化引发的。硅藻物种分布显示出MSR环境变化的复杂模式，这与在Dansgaard -Oeschger循环中格陵兰岛气温的千年至百年变化一致。