In lakes and oceans, links between modern sediment density flow processes and deposits preserved in long-term geological records are poorly understood. Consequently, it is unclear whether, and if so how, long-term climate changes affect the magnitude/frequency of sediment density flows. One approach to answering this question is to analyze a comprehensive geological record that comprises deposits that can be reliably linked to modern sediment flow processes. To address this question, we investigated the unique ICDP Core 5017-1 from the Dead Sea (the largest and deepest hypersaline lake on the Earth) depocenter covering MIS 7-1. Based on an understanding of modern sediment density flow processes in the lake, we link homogeneous muds in the core to overflows (surface flood plumes, ρ_flow<ρ_water), and link graded turbidites and debrites to underflows (ρ_flow>ρ_water). Our dataset reveals (1) overflows are more prominent during interglacials, while underflows are more prominent during glacials; (2) orbital-scale climate changes affected the flow magnitude/frequency via changing salinity and density profile of lake brine, lake-level, and source materials.

在湖泊和海洋中，现代沉积物密度流动过程与长期地质记录中保存的沉积物之间的联系知之甚少。因此，尚不清楚长期气候变化是否以及如何影响沉积物密度流动的幅度/频率。回答这个问题的一种方法是分析包含可以与现代沉积物流动过程可靠联系的沉积物的综合地质记录。为了解决这个问题，我们调查了来自死海（地球上最大和最深的高盐湖）沉积中心的独特 ICDP Core 5017-1，覆盖 MIS 7-1。基于对湖泊中现代沉积物密度流动过程的理解，我们将核心中的均质泥浆与溢流（地表洪水羽流，ρ _flow <ρ _water），并将分级浊积岩和碎屑与底流（ρ _flow > ρ _water）联系起来。我们的数据集显示（1）间冰期溢流更为突出，而冰期下溢流更为突出；(2) 轨道尺度气候变化通过改变湖泊卤水、湖泊水位和源材料的盐度和密度剖面影响流量大小/频率。