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

南极环极流（ACC）及其海洋锋面系统和深海深度控制的密集冷底水流出区（AABW）使斯科舍海成为一个特别有趣的表层和深水古海洋学重建区域。我们希望研究该锋面系统在最后一个轨道气候周期内的动力学和空间变异性。大气和海洋洋流系统输送来自南美洲的沙尘和来自南乔治亚岛（SG）的含铁矿物，从而为初级生产施肥。对邻近深海漂移沉积物岩心和高分辨率陆架沉积物进行多学科、多指标的研究将有助于表征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冰川-海洋冰川影响沉积物的范围。在一些峡湾和冰川侵蚀的沟槽中，高沉积物沉积物很好地记录了较年轻的冰川行为和气候变化。与更大、更孤立的南极冰盖相比，SG冰盖对气候变化更为敏感，因此是研究南半球过去气候变化的一个有吸引力的目标。

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.