Hydrography of the subpolar North Atlantic during the Last Interglacial

我们打算重建北大西洋次极地区域过去气候变化的详细信息，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表面温度、漂浮冰的地理分布和洋流模式的定量古气候信息，以及关于深海温度和通风的信息。感兴趣的主要时间段是最后一个间冰期，这是大约125,000年前的一个暖期，当时的气候与今天相当，但全球平均气温和海平面相对于现代值略有上升。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，到冰川作用开始和陆地冰盖重新扩张的表面和深海环流的时间和空间演变。这与13.5万年至10万年前的时间间隔相对应。这项调查旨在解决我们知识上的不足，重点是利用从高积累速率地点收集的深海沉积物岩心材料对古海洋学和古气候参数进行高分辨率分析，这为在百年时间尺度上重建北大西洋表面和深层水文提供了可能性。我们恢复的气候信息将告诉我们，不仅关于过去气候变化的方式和各种气候机制的相对影响，而且还为我们提供关于未来可能发生的变化的重要线索。

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.