Late glacial retreat of the Lancaster Sound Ice Stream and early Holocene onset of Arctic/Atlantic throughflow in the Arctic Island channels

Late glacial retreat of the Lancaster Sound Ice Stream and early Holocene onset of Arctic/Atlantic throughflow in the Arctic Island channels
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兰卡斯特峡湾冰流的冰川晚期退缩和北极岛屿航道中北极/大西洋穿流的早期全新世开始

DOI:
10.1080/15230430.2022.2110689
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发表时间:
2022
期刊:
and Alpine Research
影响因子:
--
通讯作者:
Bennett, Robbie
Bennett, Robbie
中科院分区:
--
文献类型:
--
作者:
Kelleher, Robert;Jennings, Anne;Andrews, John;Brooks, Nicole K.;Marchitto, Tom;Feng, Shaoting;Woelders, Lineke;Normandeau, Alexandre;Jenner, Kimberley;Bennett, Robbie

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来自西北巴芬湾的三个沉积物岩心中的多个代理记录了兰开斯特声音冰流(LSIS)撤退的时间,导致帕里海峡的北极-大西洋通流,这是一个重要的淡水来源,可以影响大西洋经向翻转环流。晚冰期至全新世冰退缩和通道开放的时间和区域海洋环境对这些事件的响应。我们使用定量的矿物成分,有孔虫组合,生物硅,冰筏碎片(IRD),和14 C为基础的年龄模型,记录和日期的事件和环境变化发生在冰川消退的这一主要的海洋通道。研究结果表明,LSIS退缩到兰开斯特湾发生在约15.3 cal ka BP之前,大约800年前的主要冰山崩解事件从LSIS开始,命名为巴芬湾碎屑碳酸盐事件(BBDC 1和BBDC 0)。BBDC 0的结束发生在约10.6 cal ka BP,这与帕里海峡的开放相一致。从帕里海峡开放到纳雷斯海峡开放的这段时间,是一个富含钙质底栖有孔虫和南极有孔虫的海洋环境,融水减少,季节性海冰,夏季气温升高,营养丰富的北极地表水流入。在这2,200年的时间间隔内,成对的南极和底栖14 C年龄显示年龄偏移逐渐减小,表明水柱上部~850-900 m的逐步混合。在~8.2 cal ka BP时,纳雷斯海峡的开放与大量大型中心硅藻和CaCO 3溶解形式的生物硅增加相一致。8.2 cal ka BP后钙质生物的缺乏导致在解释8.2 cal ka BP后环境变化的核心年代控制差。
Multiple proxies in three sediment cores from Northwestern Baffin Bay document the timing of Lancaster Sound Ice Stream (LSIS) retreat that led to Arctic–Atlantic throughflow in Parry Channel, an important source of freshwater that can impact the Atlantic Meridional Overturning Circulation. The Late Glacial to Holocene timing of ice retreat and channel opening and the responses of the regional ocean environment to these events are presented. We use quantitative mineral composition, foraminiferal assemblages, biogenic silica, ice-rafted debris (IRD), and14C-based age models to document and date the events and environmental changes occurring during deglaciation of this major marine channel. Findings show that retreat of the LSIS into Lancaster Sound occurred before ~15.3 cal ka BP, about 800 years before the onset of major iceberg calving events from the LSIS, named the Baffin Bay Detrital Carbonate events (BBDC 1 and BBDC 0). The end of BBDC 0 occurred at ~10.6 cal ka BP, which coincides with the opening of Parry Channel. A marine environment productive of calcareous benthic and planktic foraminifera, with diminished meltwater, seasonal sea ice, warmer summer temperatures, and inflowing, nutrient-rich Arctic surface water characterizes the interval between the opening of Parry Channel and the opening of Nares Strait. Paired planktic and benthic14C ages over this 2,200-year interval show diminishing age offsets suggesting progressive mixing of the upper ~850–900 m of the water column. The opening of Nares Strait by ~8.2 cal ka BP coincides with increased biogenic silica in the form of abundant, large centric diatoms and dissolution of CaCO3. The paucity of calcareous organisms after 8.2 cal ka BP resulted in poor chronological control in the cores to interpret changing environments after 8.2 cal ka BP.
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