Hydrography of the subpolar North Atlantic during the Last Interglacial

末次间冰期期间北大西洋副极地的水文学

• 批准号: NE/G005230/1
• 负责人: Mark Chapman
• 金额: $ 36.77万
• 依托单位: University of East Anglia
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2009
• 资助国家: 英国
• 起止时间: 2009 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FG005230%2F1
• 关键词: Hydrography; subpolar; North; Atlantic; during

We intend to reconstruct detailed information on the past variability of climate from the subpolar region of the North Atlantic in order to obtain a better understanding of the factors controlling oceanic circulation and the modes of variability that have existed in the recent past. We plan to recover quantitative palaeoclimatic information about sea surface temperatures, the geographical distribution of drift ice and current patterns as well as information about the temperature and ventilation of the deep ocean. The main time period of interest is the last interglacial period, a warm phase some 125,000 years ago when climate was comparable to the present day but global average temperatures and sea levels were slightly elevated with respect to modern values. Our overall aim is to produce new palaeoclimatic data at four key North Atlantic localities which will characterize the temporal and spatial evolution of the surface and deep ocean circulation from the end of the extremely cold conditions of the penultimate glacial period, through full interglacial conditions, to the inception of glaciation and the re-expansion of terrestrial ice sheets. This corresponds to the time interval between 135,000 and 100,000 years ago. This investigation intends to address deficiencies in our knowledge by focusing on high resolution analyses of palaeoceanographic and palaeoclimatic parameters using deep-sea sediment core material collected from high accumulation rate sites that offers the possibility of reconstructing North Atlantic surface and deep hydrography on centennial timescales. The climatic information we recover will inform us, not only about the way climate has varied in the past and the relative influence of the various climatic mechanisms, but also give us important clues about possible future changes.

我们打算重建有关从北大西洋的亚极区域的过去变异性的详细信息，以便更好地了解控制海洋循环的因素以及最近过去存在的可变性模式。我们计划恢复有关海面温度，浮冰的地理分布和当前模式的定量古气候信息，以及有关深海温度和通风的信息。兴趣的主要时期是最后一个冰间时期，这是125，000年前的温暖阶段，当时气候与当今的气候相当，但与现代价值相比，全球平均温度和海平面略有升高。我们的总体目的是在四个关键的北大西洋地区生产新的古气候数据，从倒数冰期的冰期冰川时期的极度寒冷条件结束到冰川冰期的完全冰川时期，表面和深海循环的时间和空间演变都将表征地表和深海循环。这对应于135,000至100，000年前的时间间隔。这项调查旨在通过使用高蓄积速率地点收集的深海沉积物核心材料来解决我们知识中的缺陷，以解决古生物学和古气候参数的高分辨率分析，从而提供了重建北大西洋大西洋表面和深度水文图的可能性。我们恢复的气候信息不仅会告知我们过去气候的方式以及各种气候机制的相对影响，而且还为我们提供了有关未来变化的重要线索。

项目成果

A North Atlantic tephrostratigraphical framework for 130-60 ka b2k: new tephra discoveries, marine-based correlations, and future challenges

130-60 ka b2k 的北大西洋火山地层框架：新的火山岩发现、基于海洋的相关性和未来的挑战

• DOI: 10.1016/j.quascirev.2014.03.024
• 发表时间: 2014
• 期刊: Quaternary Science Reviews
• 影响因子: 4
• 作者: Davies S