第四纪冰期-间冰期普里兹湾北部冰-海相互作用记录

In this project, four sediment cores obtained from the continental slope and northern shelf of the Prydz Bay, East Antarctic, will be selected to reconstruct frameworks, characteristics, cyclic changes of ice sheet / ice shelf / iceberg / sea ice and water mass / circulation / ocean front, and to understand the sedimentary processes and material & energy exchanges happened there during Quaternary glacial-interglacial periods since about 600 ka BP. Furthermore, we will discuss the evidences and origins related to the abnormally weak advances of ice sheet-ice shelf in the central part of the bay in the past several ice ages, assess the stability of East Antarctic cryosphere and identify the fingerprints and changes of Prydz Bottom Water during the glacial- interglacial periods. This work is important and helpful to understand the linkage between Antarctic and global change.

通过对普里兹湾北部4个沉积岩芯多元古海洋学替代指标的综合分析和对比，重建该地区第四纪冰期-间冰期（约60万年以来）冰盖-冰架-冰山-海冰、水团-环流-海洋锋面的空间配置、区域特点、多旋回变化及其间发生的沉积作用与物质能量交换，探讨该地区冰期冰盖-冰架扩张“异常”偏弱的多元古海洋学证据及其成因，冰期-间冰期东南极冰冻圈稳定性及普里兹湾底层水的发育。该研究对增进南极冰冻圈、海洋与全球变化的了解具有重要意义。

项目通过对普里兹湾表层沉积物自生铁锰组分、碎屑组分和粘土组分的Nd-Pb同位素分析，有效识别了该地区水团、沉积物来源及主要输运路径，发现了超低ƐNd值底层水端元。在此基础上，以南极普里兹湾与北部的多个沉积岩芯为研究对象，通过多元古海洋学替代指标特别是自生铁锰组分和陆源碎屑组分的Nd、Pb同位素综合分析与对比，重建了该地区第四纪冰期-间冰期特别是MIS6期以来物源与冰盖、表层海洋状态与古生产力、底层水成因与通风历史，揭示了该地区冰期-间冰期冰海相互作用机制及其对全球变化的响应和反馈。