Changing sediment provenance in the Indian Ocean-Atlantic Ocean gateway during the Pliocene in relation to current dynamics and variations in continental climate

作为全球热盐环流（THC）中不可或缺的大洋间联系，了解阿古拉斯海流系统对于提高我们对全球气候的认识非常重要。我们的目的是重建上新世和早更新世印度洋-大西洋入口主要深水块的路径和强度。我们的调查将基于IODP Exp. 361（南部非洲气候）期间获得的非破坏性物理和化学岩心和井下测井数据的整合。这些记录将与已有的地震反射数据相结合，用于绘制生物和陆源沉积物积累速率的变化，并推断过去6 Ma主要气候转变期间（如上新世中期暖期和北半球冰川作用开始）陆源沉积物的物源变化。此外，我们希望探索南极冰量的变化如何影响门户内的海洋环流模式。高分辨率的岩心扫描记录也将允许研究该地区千年尺度气候变化的阈值行为。

As an integral inter-ocean link in the global thermohaline circulation (THC), understanding the Agulhas Current system is important for improving our knowledge of the global climate. We aim at the reconstruction of pathways and intensities of major deep water masses in Indian Ocean-Atlantic gateway during the Pliocene and early Pleistocene. Our investigation will be based on an integration of non-destructive physical and chemical core- and downhole-logging data to be obtained during IODP Exp. 361 (Southern African Climates). These records combined with already existing seismic reflection data will be used to map biogenic and terrigenous sediment accumulation rate changes and to deduce terrigenous sediment provenance variations during major climate transitions of the last 6 Ma, such as the mid Pliocene warm period and the onset of Northern hemisphere glaciation. Furthermore, we want to explore how changes in Antarctic ice volume influenced the ocean circulation patterns within the gateway. The high-resolution core scanning records will also allow investigating threshold behaviour of millennial scale climate variability in the area.