Glaciation of the East Siberian Arctic during the late Quaternary (GESAQ)

拟议项目的主要研究问题来自于目前对东西伯利亚北极冰川及其对海洋和大气环流制度的影响的有限知识。拟议对北冰洋新西伯利亚岛进行的研究旨在揭示作为埋藏基底冰川冰的大量地面冰的冰川起源，并利用宇宙成因核素（氯-36、铍-10）确定冰的年龄。 对陆地和海洋永久冻土沉积物的地层背景的研究突出了巨大的地面冰的独特沉积和保存历史。通过这样做，拟议的项目有助于改进第四纪北极气候历史情景的基线数据。Novaya Sibir岛的大量地面冰具有非凡的潜力，可以直接证明假定发生在中更新世期间的陆架冰川作用的年龄和范围（海洋同位素第6阶段，MIS 6）;根据大陆架地区的地球物理数据。这项研究主要是根据德国和俄罗斯联合在新西伯利亚岛进行的实地活动，俄罗斯小组研究裸露地层，并获取陆地和海洋冻土、地冰和埋藏冰川冰的样品材料。为了以多学科方法研究矿床并突出其起源，该小组将采用冰川学、低温岩石学、沉积学、地球化学和微体古生物学方法。将采用各种测年方法来建立所研究的永久冻土和冰层的可靠年表。为了探索埋藏冰川冰的形成条件，将研究稳定水同位素地球化学、冰川水化学、冰的物理性质、气体含量和组成。Novaya Sibir是一个研究很少但独特的研究区域，可以了解欧亚北极东部的自然历史以及第四纪冰川、冰缘和海洋相互作用的联系。该项目的重点是新西伯利亚岛的冻结沉积物和埋藏的冰川冰，以揭示东西伯利亚北极地区末次间冰期前后的冰川和洪水历史，并进一步提高我们对北极地质生态系统对第四纪气候变化的响应的理解。

The main research questions of the proposed project arise from the currently limited knowledge about glaciations of the East Siberian Arctic and its impact on ocean and atmosphere circulation regimes. The proposed study on Novaya Sibir Island in the Arctic Ocean aims to uncover the glacial origin of the massive ground ice as buried basal glacier ice and to date the age of the ice by use of cosmogenic nuclides (chlorine-36, beryllium-10). The study of its stratigraphic context of terrestrial and marine permafrost deposits highlights the unique deposition and preservation history of the massive ground ice. By doing so, the proposed project contributes to improved baseline data for scenarios of the Arctic climate history during Quaternary. The massive ground ice of Novaya Sibir Island holds extraordinary potential for direct evidence of the age and the extent of the shelf glaciation which assumed took place during the mid-Pleistocene (Marine Isotope Stage 6, MIS6); based on geophysical data from the shelf area.The research is strongly based on field campaigns on Novaya Sibir Island by a joint German-Russian team to study the exposed stratigraphy and to obtain sample material of terrestrial and marine frozen ground, ground ice and buried glacier ice. To characterise the deposits in a multidisciplinary approach and highlight their origin, the team will employ glaciological, cryolithological, sedimentological, biogeochemical and micropaleontological methods. Various dating approaches will be applied to establish a reliable chronology of the studied permafrost and ice strata. To explore the formation conditions of the buried glacier ice, stable water isotope geochemistry, glaciohydrochemistry, physical properties of ice, gas content and composition will be studied.Novaya Sibir is a poorly studied but unique study area for understanding the natural history of the Eastern Eurasian Arctic as well as the linkage of Quaternary glacial, periglacial and marine interactions. The project focusses on the Novaya Sibir Island's frozen deposits and buried glacier ice to uncover the glacial and inundation history of the East Siberian Arctic before and after the Last Interglacial, and further to enhance our understanding of the Arctic geoecosystem response to Quaternary climate change.