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Orbital and suborbital environmental changes in the Western Bering Sea during the last 172 ka Inferred from Diatom and Productivity Proxies

机译:在硅藻和生产力代理推断出西部白垩海中的轨道和副血管环境变化

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摘要

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.
机译:硅藻丰富和物种分布在过去172 ka之外比率),磁化率和前面衍生的生物标志物代理,并在本文中从沉积物核心SO201-2-85KL在中间脊(MSR)中回收。可用数据表明,MSR区域在寒冷小姐6.5-2期间经历了一个重要的季节性海冰。在寒冷的MIS 2期间,冰放电的主要区域延伸了MSR的,可能在海外面延伸,而在最冷的MIS 6.2之外,由于阿雷迪斯低到东西伯利亚的阿雷迪人的变化,MSR区域没有冰块海岸和风暴温暖和湿风的向北转移到西方白垩。在温暖的MIS 5.5期间,MSR地区的海冰影响可忽略不计,几乎与上海世贸组织相同,事件26(120.5 kA)后开始增加。达到硅藻和物种分布的千禧一代变化是由格陵兰·普伦斯托斯伴随着生产力变化的。硅藻种分布显示了MSR环境的复杂变异模式,与格陵兰空气温度上的千禧一年变化符合丹参之部--OSchger循环。它确认了在千年 - 百年时间尺度上这些偏远地区之间的大气电信连接的快速机制。

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