Integrating terrestrial and marine sediment records from East Antarctica to explore late Pleistocene and Holocene ice sheet instability

整合东南极洲的陆地和海洋沉积物记录，探索晚更新世和全新世冰盖的不稳定性

• 批准号: 463250038
• 负责人: Dr. Sonja Berg
• 金额: --
• 依托单位: Institut für Geologie und Mineralogie
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/463250038?language=en
• 关键词: Integrating; terrestrial; marine; sediment; records

Within the proposed project we want to study ice-ocean-climate interactions that potentially affected the stability of the East Antarctic Ice sheet from the late Pleistocene until present day. We select a multi-proxy approach to integrate evidence from terrestrial, lacustrine and marine sedimentary archives. Additionally, mumiyo deposits are used as archives to close the gap between the ice-proximal lacustrine and terrestrial and ice-distal open-marine archives. Three target regions were defined to exemplarily study different processes of ice-ocean-climate interaction: Central Dronning Maud Land and the adjacent ocean, Mawson Coast, part of the Mac. Robertson Land, and Thala Hills, an un-glaciated coastal site at Prince Olav Coast, Enderby Land.Reconstructions in the respective regions will include the temporal development of post-glacial ice retreat and the prevailing climatic conditions. Furthermore, biomarker and stable isotope analyses on marine sediments and mumiyo will be used to study the temporal variability of sea ice extent and polynya activity. Both parameters influence energy and gas exchange between atmosphere and ocean and ocean circulation, which interact with the ice sheet and ultimately affect ice sheet stability.

在拟议的项目中，我们希望研究冰-海洋-气候相互作用，这些相互作用可能影响从晚更新世到现在的东南极冰盖的稳定性。我们选择了一种多代理方法来整合来自陆地、湖泊和海洋沉积档案的证据。此外，Mumiyo沉积物被用作档案馆，以弥合近冰湖与陆上和冰远开阔海洋档案馆之间的差距。为了示范研究冰-海洋-气候相互作用的不同过程，定义了三个目标区：中部Dronning Maud陆地和邻近的海洋，Mawson海岸，Mac的一部分。位于恩德比州奥拉夫王子海岸的未冰川海岸的塔拉山。各自地区的重建将包括冰川后冰川消退的时间发展和普遍的气候条件。此外，还将利用海洋沉积物和Mumiyo的生物标志物和稳定同位素分析来研究海冰面积和Polynya活动的时间变异性。这两个参数都影响着大气和海洋之间的能量和气体交换以及海洋环流，而海洋环流又与冰盖相互作用，最终影响冰盖的稳定性。