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Investigating North Atlantic circulation changes during Late Quaternary interglacial periods

研究晚第四纪间冰期北大西洋环流变化

基本信息

批准号：
2733072
负责人：
金额：
--
依托单位：
University College London
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2022
资助国家：
英国
起止时间：
2022 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2733072
关键词：
Investigating North Atlantic circulation changes

项目摘要

The North Atlantic is a key region for understanding global climate dynamics. Variability in North Atlantic circulation has been linked with abrupt climate events during past warm periods (interglacials), including the current interglacial (Holocene, ~11.700 years - today), but the nature and causal mechanisms of these changes have not yet been fully elucidated. This project will use a network of strategically located sites in the subpolar North Atlantic to investigate the spatial pattern of ocean changes during previous interglacials and explore their origin. Different palaeoceanographic proxies, including faunal foraminiferal assemblages, ice-rafted debris, and sortable silt, as well as neodymium and carbon isotopes, will be used to investigate changes in the surface and deep ocean circulation for interglacial intervals of the last 450,000 years. The combination of the above records will allow the identification of system thresholds as well as the underlying patterns and mechanisms involved in interglacial variability of ocean circulation on both short (i.e., centennial) and long (multi-millennial) timescales, and the mechanisms occurring during the onset and end of interglacials. These constraints will provide new insights on the stability of North Atlantic circulation, informing climate model simulations and improving our ability to forecast abrupt climate change events.

北大西洋是了解全球气候动态的关键区域。北大西洋环流的变化与过去温暖时期（间冰期）的突发气候事件有关，包括目前的间冰期（全新世，约11.700年-今天），但这些变化的性质和因果机制尚未完全阐明。该项目将利用位于北大西洋亚极地的战略地点网络，调查前几次间冰期海洋变化的空间格局，并探索其起源。不同的古海洋学代理，包括动物群有孔虫组合，冰筏碎片和可分选的淤泥，以及钕和碳同位素，将被用来调查在过去45万年间冰期的表面和深海环流的变化。上述记录的结合将允许识别系统阈值以及涉及海洋环流间冰期变化的基本模式和机制，百年）和长（多千年）的时间尺度，以及发生在间冰期的开始和结束的机制。这些制约因素将为北大西洋环流的稳定性提供新的见解，为气候模型模拟提供信息，并提高我们预测气候突变事件的能力。