Palaeoclimatic analyses of southern Atlantic islands as part of an inter-hemisheric ocean transect

古气候研究的一个关键问题是大西洋从南到北，即从赤道地区到高纬度地区的热输送背后的动力学。这个复杂的气候系统的驱动机制是什么？在气候变化的各个阶段，北半球和南半球是如何响应的？回答这些问题的一个关键是一个年代准确、空间分布广泛的“古气候站”网络。第四纪气候资料的一个广泛未开发的信息来源是大西洋岛屿。基本的想法是获得陆地代理数据，记录大气条件，但在一个完整的海洋设置。自2000年以来，瑞典主导的亚特兰蒂斯项目收集并分析了大西洋各个岛屿的数据。现在，这项工作的目标是对Isla de los Estados（阿根廷，55.8°S, 64.25°W）的湖泊沉积物、泥炭沼泽和树木年轮进行地球化学和辐射分析，以扩展该数据库。该岛绝对是南极、南美和大西洋记录之间最好的古气候“锚点”。因此，在全球大气和海洋环流模式变化的背景下，它可能对更好地理解大西洋数据发挥关键作用。

One key question of palaeoclimatic research is the dynamics behind the Atlantic heat transport from South to North, i.e. from equatorial regions to higher latitudes. What are the driving mechanisms of this complex climate system, and how do the northern and southern hemispheres respond during phases of climate change? One key to answer these questions is a network of well-dated, spatially widely distributed ¿palaeoclimatic stations¿. A widely unexplored source of information on Quaternary climate data are the Atlantic islands. The basic idea is to obtain terrestrial proxy data which record atmospheric condition but within a complete ocean setting. Since 2000 the Swedish lead ATLANTIS project gathered and analysed data of various islands through the Atlantic. Now, this work aims at geochemical and radiometric analyses of lake sediments, peat bogs and tree rings of the Isla de los Estados (Argentina, 55.8°S, 64.25°W) to extend this data base. The island is absolutely the best palaeoclimatic ¿anchoring point¿ between Antarctic, South American and Atlantic records. Thus, it may play a key role for a better understanding of the Atlantic data within the context of changes of global circulation patterns, both atmospheric and marine.