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Changes in sediment provenance and ocean circulation on the northern slope of the Bering Sea since the last deglaciation
Marine Geology ( IF 2.6 ) Pub Date : 2021-04-22 , DOI: 10.1016/j.margeo.2021.106492
Yechen Sun , Wenshen Xiao , Rujian Wang , Li Wu , Yijing Wu

Changes in water circulation in the Bering Sea have profoundly impacted biological productivity, carbon cycle and global ocean circulation, especially from the last deglaciation to the Holocene. Grain size and clay mineral composition were investigated in core ARC6-B10, collected from the northern Bering slope, in order to reveal changes in circulation and sediment provenance since the late deglaciation (~13.7 ka). The results highlight changes in sea level and atmospheric circulation as the primary controls on the variations in grain size and clay mineralogy. Deglacial sea level rise deepened the water passages along the Aleutian Arc, enhanced the inflow of North Pacific water that strengthened the circulation of the Bering Sea, and receded the coastline. These changes increased the supply of smectite-enriched sediments from the Aleutian Islands to the core site. A temporary reduction in smectite and an increase in the illite and chlorite contents during the Preboreal period correspond to the opening of the Bering Strait; this is attributed to rapid sea level rise which resulted in increased sediment resuspension from the shelf. During the mid- to late Holocene, when the sea level stabilized, changes in the Aleutian Low (AL) were a major factor modulating changes in ocean circulation. A weakened AL in the mid-Holocene intensified the northward Bering Slope Current and the increased the flow through the Bering Strait, while an intensified AL, along with an expanded sea ice cover during the late Holocene may have weakened the northward flow.



中文翻译:

末次冰期以来白令海北坡沉积物来源和海洋环流的变化

白令海水循环的变化深刻影响了生物生产力,碳循环和全球海洋循环,特别是从最后一次冰消期到全新世。研究了从白令北部斜坡收集的ARC6-B10岩心的颗粒大小和粘土矿物组成,目的是揭示自晚冰期后(〜13.7 ka)以来环流和沉积物来源的变化。结果突出了海平面和大气环流的变化,将其作为控制粒度和粘土矿物学变化的主要控制因素。冰川消融的海平面上升加深了阿留申弧沿线的水道,增加了北太平洋水的流入量,从而加强了白令海的环流,并使海岸线后退。这些变化增加了从阿留申群岛到核心站点的富蒙皂石沉积物的供应。在前原地带时期,蒙脱石的暂时减少和伊利石和绿泥石含量的增加对应于白令海峡的开放。这归因于海平面的快速上升,导致架子上沉积物的重悬增加。在全新世中期至后期,当海平面稳定时,阿留申低压(AL)的变化是调节海洋环流变化的主要因素。全新世中期的AL减弱,使白令坡北流增强,并增加了通过白令海峡的流量,而全新世晚期,AL的增强以及海冰覆盖的扩大可能削弱了北流。在前原地带时期,蒙脱石的暂时减少和伊利石和绿泥石含量的增加对应于白令海峡的开放。这归因于海平面的快速上升,导致架子上沉积物的重悬增加。在全新世中期至后期,当海平面稳定时,阿留申低压(AL)的变化是调节海洋环流变化的主要因素。全新世中期的AL减弱,使白令坡北流增强,并增加了通过白令海峡的流量,而全新世晚期,AL的增强以及海冰覆盖的扩大可能削弱了北流。在前原地带时期,蒙脱石的暂时减少和伊利石和绿泥石含量的增加对应于白令海峡的开放。这归因于海平面的快速上升,导致架子上沉积物的重悬增加。在全新世中期至后期,当海平面稳定时,阿留申低压(AL)的变化是调节海洋环流变化的主要因素。全新世中期的AL减弱,使白令坡北流增强,并增加了通过白令海峡的流量,而全新世晚期,AL的增强以及海冰覆盖的扩大可能削弱了北流。这归因于海平面的快速上升,导致架子上沉积物的重悬增加。在全新世中后期,当海平面稳定时,阿留申低(AL)的变化是调节海洋环流变化的主要因素。全新世中期的AL减弱,使白令坡北流增强,并增加了通过白令海峡的流量,而全新世晚期,AL的增强以及海冰覆盖的扩大可能削弱了北流。这归因于海平面的快速上升,导致架子上沉积物的重悬增加。在全新世中后期,当海平面稳定时,阿留申低(AL)的变化是调节海洋环流变化的主要因素。全新世中期的AL减弱,使白令坡北流增强,并增加了通过白令海峡的流量,而全新世晚期,AL的增强以及海冰覆盖的扩大可能削弱了北流。

更新日期:2021-04-23
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