晚更新世阿蒙森海生产力和冰筏输入的变化对表层海洋环境和西南极冰盖演化的指示

张静渊, 肖文申, 王汝建, 樊加恩, 王含章, 杨如意. 晚更新世阿蒙森海生产力和冰筏输入的变化对表层海洋环境和西南极冰盖演化的指示[J]. 海洋地质与第四纪地质, 2023, 43(2): 136-144. doi: 10.16562/j.cnki.0256-1492.2023020802
引用本文: 张静渊, 肖文申, 王汝建, 樊加恩, 王含章, 杨如意. 晚更新世阿蒙森海生产力和冰筏输入的变化对表层海洋环境和西南极冰盖演化的指示[J]. 海洋地质与第四纪地质, 2023, 43(2): 136-144. doi: 10.16562/j.cnki.0256-1492.2023020802
ZHANG Jingyuan, XIAO Wenshen, WANG Rujian, FAN Jiaen, WANG Hanzhang, YANG Ruyi. Changes in productivity and ice-rafting input in the Amundsen Sea during the Late Pleistocene: Implications on the evolution of surface-ocean environment and the West Antarctic Ice Sheet[J]. Marine Geology & Quaternary Geology, 2023, 43(2): 136-144. doi: 10.16562/j.cnki.0256-1492.2023020802
Citation: ZHANG Jingyuan, XIAO Wenshen, WANG Rujian, FAN Jiaen, WANG Hanzhang, YANG Ruyi. Changes in productivity and ice-rafting input in the Amundsen Sea during the Late Pleistocene: Implications on the evolution of surface-ocean environment and the West Antarctic Ice Sheet[J]. Marine Geology & Quaternary Geology, 2023, 43(2): 136-144. doi: 10.16562/j.cnki.0256-1492.2023020802

晚更新世阿蒙森海生产力和冰筏输入的变化对表层海洋环境和西南极冰盖演化的指示

  • 基金项目: 国家自然科学基金“第四纪冰期旋回中南大洋中深层水向中低纬太平洋的入侵及其气候效应”(42030401);自然资源部国家海洋局极地考察办专项“南极重点海域对气候变化的响应和影响”子课题(01-03-02D)
详细信息
    作者简介: 张静渊(2000—),男,硕士研究生,专业方向为海洋地质学与古环境研究,E-mail:2231674@tongji.edu.cn
    通讯作者: 肖文申(1982—),男,博士,副教授,从事古海洋与古气候研究,E-mail:wxiao@tongji.edu.cn
  • 中图分类号: P736.2

Changes in productivity and ice-rafting input in the Amundsen Sea during the Late Pleistocene: Implications on the evolution of surface-ocean environment and the West Antarctic Ice Sheet

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  • 阿蒙森海是当前全球变暖背景下西南极冰盖消融的核心区域。本文分析了中国第34次南极考察采集自阿蒙森海的ANT34-A5-7岩芯中生产力和冰筏碎屑含量等指标,旨在重建研究区深海氧同位素MIS 6期以来表层海洋环境和西南极冰盖演化历史。研究结果显示,阿蒙森海生产力呈现间冰期高、冰期低的特征。在末次间冰期(MIS 5.5)具有比当前更高的生产力水平,同时伴随着西南极冰盖的严重消融。这个现象归因于MIS 5.5更暖的海表温度、更少的海冰覆盖,以及向南入侵的绕极深层水的上涌。该研究结果可对预测未来气候变化提供必要的理论依据。

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  • 图 1  阿蒙森海区域概况及研究站位

    Figure 1. 

    图 2  南极冰芯EDC指示的南极温度变化[36]、全球海平面[37]、全球大洋底栖有孔虫LR04-δ18O曲线[32]与A5-7岩芯XRF-Ca/Al、-Si/Al,火山灰丰度(VG),IRD(>150 μm)含量对比(a)以及年龄控制点与线性沉积速率(b)

    Figure 2. 

    图 3  南极EDC冰芯CO2浓度 [39]、温度变化 [36]、海冰覆盖指标ssNa+通量 [40]及风尘指标nssCa2+通量 [40],德雷克海峡PS97/093-2岩芯XRF-Zr/Rb [41],与A5-7岩芯有孔虫丰度、XRF-Ca/Al、-Si/Al、生物硅含量(opal)、有机碳与氮含量(TOC、TN)、有机碳氮比值 (C/N)、IRD含量(>150 μm)和磁化率记录进行对比

    Figure 3. 

    表 1  南极阿蒙森海ANT34-A5-7岩芯AMS 14C测年数据及其校正年龄

    Table 1.  Result and calibration of AMS 14C dating data of core A5-7

    深度/cm测试材料14C年龄/aBP碳储库和老碳校正年龄/aBP日历年 /aBP
    0~2有机碳12476±298645±297807±207
    2~4有机碳14081±3410250±3410091±274
    2~4N. pachyderma11550±3010250±3010091±222
    50~52有机碳25121±7321290±7323286±307
    74~76有机碳20168±5016337±5017524±282
    90~92有机碳26389±8422558±8424542±364
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收稿日期:  2023-02-08
修回日期:  2023-02-22
录用日期:  2023-02-22
刊出日期:  2023-04-28

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