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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

基本信息

批准号：
NE/G007373/1
负责人：
William Edward Newns Austin
金额：
$ 14.88万
依托单位：
University of St Andrews
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%2FG007373%2F1
关键词：
Hydrography subpolar North Atlantic during

项目摘要

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.

我们打算重建北大西洋副极地区域过去气候变化的详细资料，以便更好地了解控制海洋环流的因素和最近存在的变化模式。我们计划恢复有关海洋表面温度、流冰的地理分布和海流模式的定量古气候信息，以及有关深海温度和通风的信息。主要的时间段是最后一个间冰期，这是一个大约125，000年前的温暖阶段，当时的气候与现在相当，但全球平均温度和海平面相对于现代值略有升高。我们的总体目标是在北大西洋四个关键地点产生新的古气候数据，这些数据将描述从倒数第二个冰期极端寒冷条件结束到完全间冰期条件，再到冰川作用开始和陆地冰盖重新扩张的表层和深海环流的时空演变。这对应于135，000到100，000年前的时间间隔。这项调查旨在解决我们的知识的缺陷，侧重于高分辨率分析的古海洋和古气候参数使用深海沉积物芯材料收集的高积累率网站，提供重建北大西洋表面和深层水文百年时间尺度的可能性。我们恢复的气候信息不仅可以告诉我们过去气候变化的方式以及各种气候机制的相对影响，还可以为我们提供有关未来可能变化的重要线索。