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

上新世印度洋-大西洋门户沉积物来源的变化与大陆气候当前动态和变化的关系

• 批准号: 319388354
• 负责人: Dr. Gabriele Uenzelmann-Neben
• 金额: --
• 依托单位: Lamont-Doherty Earth Observatory
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/319388354?language=en
• 关键词: Changing; sediment; provenance; Indian; Ocean

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.

作为全球温盐环流（THC）中不可或缺的海洋间联系，了解厄加勒斯洋流系统对于提高我们对全球气候的了解非常重要。我们的目标是重建上新世和早更新世印度洋-大西洋门户主要深水团的路径和强度。我们的调查将基于 IODP 实验期间获得的无损物理和化学岩心和井下测井数据的整合。 361（南部非洲气候）。这些记录与现有的地震反射数据相结合，将用于绘制生物和陆源沉积物积累速率的变化图，并推断过去6Ma主要气候转变期间的陆源沉积物物源变化，例如上新世中期温暖期和北半球冰川期的开始。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允许调查该地区千年尺度气候变化的阈值行为。

项目成果

South African Climates (Agulhas LGM Density Profile). Proceedings of the International Ocean Discovery Program, 361: College Station, TX (International Ocean Discovery Program)

• DOI: 10.14379/iodp.proc.361.2017
• 发表时间: 2017-09
• 作者: I. Hall;S. Hemming;L. Levay;E. Scientists