West Antarctic Ice Sheet dynamics between Ross Sea and Amundsen Sea embayments from seismic records and drill data (IODP Expeditions 379 and 374)

来自地震记录和钻探数据的罗斯海和阿蒙森海海湾之间的西南极冰盖动态（IODP 探险 379 和 374）

• 批准号: 427200564
• 负责人: Professor Dr. Karsten Gohl
• 金额: --
• 依托单位: Sektion Geophysik
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/427200564?language=en
• 关键词: West; Antarctic; Ice; Sheet; dynamics

The submarine-based West Antarctic Ice Sheet is suspected to be highly sensitive to climate changes, in particular to in periods of increasing global atmospheric temperatures. The Amundsen Sea sector of the WAIS is in particular vulnerable, because of currently observed incursions of warm Circumpolar Deep Water and ongoing subglacial, ocean-driven melt processes. These observations and the necessity to address paleo-ice sheet constraints for better future sea-level projections have made both the Ross Sea Embayment and the Amundsen Sea Embayment destinations of the two consecutive IODP Expeditions 374 (early 2018) and 379 (early 2019). Both regions are connected via a continuous seismic transect that will be supplemented with additional seismic profiles on the continental rise to be collected during a Russian expedition in early 2019. The seismic profiles will establish a differential and detailed comparison between the sequence stratigraphies of the Amundsen Sea and Ross Sea. In a collaborative effort with the Science Teams of both IODP expeditions and the Russian partners, we plan to analyse the new seismic data, integrate them with pre-existing seismic profiles and perform a thorough and detailed study on the seismic-stratigraphic sequences, units and horizons across the region between the two embayments. The seismic network will be linked to the IODP 374 and 379 drill sites via a careful seismic to core-log integration which will be conducted using the drill core records, physical property data and downhole logging data. Generated synthetic seismograms will be used to compare with seismic profile records at these sites. A trans-regional stratigraphic age and sedimentary compositional model across the Amundsen Sea and Ross Sea sectors is the aim of this first work phase. This will include the development of pre-glacial and glacially dominated sediment transport/deposition models in order to decipher and understand the transitional change-over phase from the greenhouse to the icehouse environment. In the second synthesis phase, the glacially dominated sedimentation processes will be translated to describe flow dynamical patterns of the WAIS in the Amundsen Sea and Ross Sea regions. The sedimentary model will show if and how the past glacial outflow characteristics of the WAIS has changed between Amundsen Sea and Ross Sea sectors.

据怀疑，基于海底的西南极冰盖对气候变化高度敏感，特别是在全球大气温度升高的时期。由于目前观察到的温暖的近极深水和正在进行的海洋驱动熔体过程的入侵，因此尤其是WAIS的Amundsen海洋部门特别容易受到伤害。这些观察结果以及解决未来海平面预测的古冰纸约束的必要性使得罗斯海嵌入和连续两次IODP Expeditions 374（2018年初）和379（2019年初）（2019年初）的Amundsen Sea Embayment目的地（2019年初）。这两个区域均通过连续的地震晶体连接，该区域将在2019年初在俄罗斯探险期间收集的大陆上升上的其他地震概况。地震曲线将建立Amundsen Sea和Ross Sea的序列地层之间的差异和详细比较。在与IODP探险和俄罗斯合作伙伴的科学团队的合作努力中，我们计划分析新的地震数据，将它们与先前存在的地震概况相结合，并对两次弹药之间整个区域之间的地震 - 地层序列，单位和地平线进行详尽而详细的研究。地震网络将通过仔细的地震到核心gog集成链接到IODP 374和379钻头，该钻机将使用钻头核心记录，物理属性数据和井下记录数据进行。生成的合成地震图将用于与这些位点的地震曲线记录进行比较。在整个阿蒙森海和罗斯海部的跨区域地层年龄和沉积组成模型是第一个工作阶段的目的。这将包括开发冰川前和冰川统治的沉积物传输/沉积模型，以破译和了解从温室到冰屋环境的过渡变化阶段。在第二个合成阶段，将翻译以冰川支配的沉积过程来描述Amundsen Sea和Ross Sea Regions中WAI的流动动力学模式。沉积模型将表明WAIS的过去冰川流出特性是否以及如何在Amundsen Sea和Ross Sea部门之间发生变化。