Pleistocene Sediments around South Georgia: archives for Antarctic Circumpolar Current dynamics and climate-induced signals in Sub-Antarctica (Past-ACC)

南乔治亚岛周围的更新世沉积物：南极绕极流动力学和亚南极洲气候诱发信号的档案（过去 ACC）

• 批准号: 424484222
• 负责人: Professor Dr. Gerhard Bohrmann, since 10/2022
• 金额: --
• 依托单位: Fachgebiet Marine 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/424484222?language=en
• 关键词: Pleistocene; Sediments; around; South; Georgia

The Antarctic Circumpolar Current (ACC) with its system of oceanographic fronts and bathymetrically deep-controlled outflow areas of dense and cold bottom water (AABW) make the Scotia Sea a particularly interesting area for surface and deep water paleoceanographic reconstruction. We want to study the dynamics and spatial variability of this frontal system during the last orbital climate cycle. The atmospheric and oceanographic current system transports dust from South America and together with ferrous minerals from South Georgia (SG) thereby fertilizing primary production. Multidisciplinary and multi-proxy investigations on sediment cores of drift deposits in the adjacent deep sea and on high-resolution shelf sediments will help to characterize relevant processes and amplitudes of natural climate changes. Nearshore and on the continental shelf, the extent of inland ice caps and glacial-marine glacier-affected sediments were mapped using multi-beam and sediment echo-sounders. High sediment deposits in some fjords and glacially eroded troughs have excellently archived the younger glacier behaviour and climatic changes. The SG ice cap is more sensitive to climatic changes than the much larger and more isolated Antarctic ice sheets, and is therefore an attractive target to study past climate variability in the Southern Hemisphere.

南极绕极流（ACC）及其海洋学锋系统和水深深度控制的密集和寒冷的底层水（AABW）流出区，使斯科舍海的表层和深水古海洋学重建特别感兴趣的地区。我们想研究在最后一个轨道气候周期中锋面系统的动态和空间变化。大气和洋流系统将来自南美洲的尘埃与来自南格鲁吉亚（SG）的黑色金属矿物一起输送，从而破坏了初级生产。对邻近深海漂流沉积物的沉积物芯和高分辨率陆架沉积物进行多学科和多替代物调查，将有助于确定自然气候变化的相关过程和幅度。在近岸和大陆架上，利用多波束和沉积物回声测深仪绘制了内陆冰盖和受冰川-海洋冰川影响的沉积物的范围。一些峡湾和冰川侵蚀槽中的大量沉积物很好地记录了较年轻的冰川行为和气候变化。SG冰帽比更大和更孤立的南极冰盖对气候变化更敏感，因此是研究南半球过去气候变化的一个有吸引力的目标。