北大西洋45°N区氧同位素3期以来上层水体性质的变化

叶孝贤, HarunurRashid. 北大西洋45°N区氧同位素3期以来上层水体性质的变化[J]. 海洋地质与第四纪地质, 2021, 41(3): 114-123. doi: 10.16562/j.cnki.0256-1492.2020073102
引用本文: 叶孝贤, HarunurRashid. 北大西洋45°N区氧同位素3期以来上层水体性质的变化[J]. 海洋地质与第四纪地质, 2021, 41(3): 114-123. doi: 10.16562/j.cnki.0256-1492.2020073102
YE Xiaoxian, Harunur Rashid. Changes of the upper water column at the 45°N North Atlantic since marine isotope stage 3[J]. Marine Geology & Quaternary Geology, 2021, 41(3): 114-123. doi: 10.16562/j.cnki.0256-1492.2020073102
Citation: YE Xiaoxian, Harunur Rashid. Changes of the upper water column at the 45°N North Atlantic since marine isotope stage 3[J]. Marine Geology & Quaternary Geology, 2021, 41(3): 114-123. doi: 10.16562/j.cnki.0256-1492.2020073102

北大西洋45°N区氧同位素3期以来上层水体性质的变化

  • 基金项目: 国家自然科学基金项目“浮游有孔虫δ18O和Mg/Ca比值示踪过去45万年以来西北大西洋混合层和温跃层的温度和密度梯度在千年尺度上的变化”(41776064)
详细信息
    作者简介: 叶孝贤(1996—),女,硕士研究生,主要从事海洋地质学及古海洋环境研究,E-mail:m180200489@st.shou.edu.cn
    通讯作者: Harunur Rashid(1969—),男,教授,主要从事海洋地质学、古海洋学、低温地球化学研究,E-mail:rashid@shou.edu.cn
  • 中图分类号: P736.4

Changes of the upper water column at the 45°N North Atlantic since marine isotope stage 3

More Information
  • 北大西洋45°N区是北大西洋冰筏碎屑(IRD)带的中心区,其海洋沉积物包含高分辨率沉积环境和气候变化信息,对45°N区沉积记录的研究有利于反演末次冰期以来古海洋环境的变化。通过对岩心Hu71-377中IRD含量的统计、浮游有孔虫组合及氧和碳同位素(δ18O和δ13C)分析,重建了北大西洋45°N上层水体水团性质演化历史。结合AMS14C数据和氧同位素地层学,在氧同位素3期(MIS3)和2期(MIS2)中识别出5个Heinrich层,其中Heinrich 1、2和4层具有明显IRD峰值、Neogloboquadrina pachyderma高丰度和轻δ18O值特征,而Heinrich 3和5层的δ18O值未明显变轻。Heinrich 3和5层与Heinrich 1、2和4层的δ18O 差异可能反映了上层水体受融水输入的影响不同。δ13CN.incompta和δ13CN.pachyderma差值也反映了Heinrich事件期间混合层和温跃层的变化,它们的δ13C差值在Heinrich 1和2期间接近零,归因于强风驱动的海水垂向混合。而δ13CN.incompta和δ13CN.pachyderma差值在Heinrich 4和5期间增大,反映了季节性温跃层变浅,推测与北大西洋暖流增强有关。浮游有孔虫组合进一步反映了海洋上层水团性质, 特别是N. pachydermaNeogloboquadrina incompta的相对丰度反映了MIS3期以来海表温度(SST)变化。

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  • 图 1  北大西洋Hu71-377与相关岩心[8,28-29]的位置以及洋流和SST分布

    Figure 1. 

    图 2  岩心Hu71-377深度-年龄模型(a)和沉积速率(b)

    Figure 2. 

    图 3  北大西洋Hu71-377岩心IRD、N. pachyderma相对丰度和δ18O指标与DSDP609岩心[36]和NGRIP冰芯[35]地层学对比以及SU9008岩心[28]相关指标

    Figure 3. 

    图 4  北大西洋Hu71-377岩心IRD、有孔虫相对丰度、δ18O和δ13C、壳体质量等指标与岩心SO82_5-2[29] 和DSDP609[37]的δ18O和δ13C指标

    Figure 4. 

    表 1  岩心Hu71-377 14C年龄及日历年龄

    Table 1.  14C Age and Calendar Age of the core Hu71-377

    深度/cm实验ID14C年龄/a测试材料日历年龄/ka
    0 ~ 2UCI-2120151930±15G. inflata1.333
    68.5 ~ 69.5UCI-21403711545±25G. inflata12.860
    115 ~ 116UCI-2384315840±60N. pachyderma18.174
    256 ~ 257UCI-21202125610±80G. inflata28.887
    389 ~ 390UCI-21403937120±230G. bulloides40.920
    下载: 导出CSV

    表 2  NGRIP冰芯、DSDP609岩心和Hu71-377岩心的Heinrich事件相关控制点

    Table 2.  Heinrich events in the ice core NGRIP, core DSDP609 and core Hu71-377

    控制点NGRIP[36]DSDP609[35]Hu71-377[27]
    年龄/kaδ18O/‰深度/cmδ18O/‰深度/cmδ18O/‰
    Heinrich 115.58−44.56884.25110.54.30
    Heinrich 223.72−45.291203.891784.14
    Heinrich 329.70−46.451583.93273.53.54
    Heinrich 438.72−44.412483.88405.53.34
    Heinrich 548.16−45.083053.67562.53.46
    下载: 导出CSV
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