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

作为全球温盐环流（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。我们的目的是重建的路径和强度的主要深水块在印度洋-大西洋门户在上新世和早更新世。我们的调查将基于综合的非破坏性的物理和化学的核心和井下测井数据将获得在IODP实验。361（南部非洲气候）。这些记录与现有的地震反射数据相结合，将被用来映射生物和陆源沉积物积累率的变化，并推断陆源沉积物来源的变化在过去6马的主要气候转变，如上新世中期温暖期和北方半球冰川的开始。此外，我们想探索南极冰量的变化如何影响门户内的海洋环流模式。高分辨率岩心扫描记录还将有助于调查该地区千年尺度气候变率的阈值行为。

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.