张静渊,肖文申,王汝建,等. 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,等. 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,et al. 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,et al. 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

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

  • 摘要: 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。

     

    Abstract: The Amundsen Sea is the core area of the melting West Antarctic Ice Sheet (WAIS) in the recent global warming process. Productivity proxies and ice rafted debris (IRD) contents in core ANT34-A5-7 collected from the Amundsen Sea during the 34th Chinese Antarctic Research Expedition were investigated, to reveal the changes of the surface-ocean environment and the evolution history of the WAIS since the MIS (Marine Isotope Stage) 6. Results show increased (decreased) productivity during interglacial (glacial) periods. In particular, the higher productivity level than the Holocene productivity ones during the MIS 5.5 was accompanied by significant WAIS melting. These findings could be interpreted as warmer sea surface, less sea ice, and stronger upwelling of the circum-polar deep water in the Amundsen Sea during the MIS 5.5. This study provided valuable information for predicting future climate changes.

     

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