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

• 批准号: 2733072
• 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

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.

北大西洋是理解全球气候动态的关键区域。北大西洋循环的变异性与过去的温暖时期（冰间）的突然气候事件有关，包括当前的冰川间（全新世，〜11.700年 - 今天），但这些变化的性质和因果机制尚未完全阐明。该项目将使用北大西洋亚北大西大学的战略性位置网络，以研究以前的冰川间冰川中的海洋变化的空间模式，并探索其起源。不同的古生图代理，包括动物有孔虫的组合，冰碎片，可排序的淤泥以及新近山和碳同位素，将用于研究过去450,000年的冰间间隔的地表和深海循环的变化。上述记录的结合将允许识别系统阈值以及在短（百年）和长（百年）和长（百年）的时间尺度上及其在海洋循环中涉及的基本模式和机制，以及在冰川间的发作和结束。这些限制将为北大西洋循环的稳定性提供新的见解，为气候模型模拟提供了信息，并提高了我们预测突然气候变化事件的能力。