Climatic teleconnections between the tropical and polar North Atlantic during the last interglacial period

拟议的研究旨在重建整个末次间冰期循环（MIS 5e/Eemian）中北大西洋低纬和高纬之间的纬向表面海洋温度梯度的发展，即，从冰川消退期开始（终止2）到冰川开始期结束（MIS 5d）。将使用北大西洋主要地点的海洋沉积物岩心。这些地点控制着西部热带/亚热带环流和南大洋向北的水流;墨西哥湾流的起源;北欧海的暖（大西洋）和冷（极地）水流。所采用的方法将以有孔虫组合研究和稳定同位素（O/C）、生物标志物（UK 37）和大量沉积物元素组成（X射线荧光扫描）的地球化学分析为基础。这些数据不仅可以更好地评估Eemian期间过去海洋表面特性（温度-盐度）的自然强迫变化，跨纬度多代理方法还将提供一个改进的海洋数据库，以更好地约束数值气候模型。

The proposed study aims at reconstructing the development of the meridional surface ocean temperature gradients between the low and high latitude North Atlantic across the entire last interglacial cycle (MIS5e/Eemian), i.e., from its onset during deglaciation (Termination 2) to its end during glacial inception (MIS5d). Marine sediment cores from key locations in the North Atlantic will be employed. These sites control the western tropical/subtropical gyre and northward water flow from the Southern Ocean; the origin of the Gulf Stream; the warm (Atlantic) and cold (polar) water currents of the Nordic Seas. Methods applied will be based on foraminiferal assemblage studies and stable isotopes (O/C), geochemical analyses of biomarker (UK37) and of the elemental composition of the bulk sediment (XRF scanning). The data will not only allow a better assessment of naturally-forced changes in past ocean surface properties (temperature-salinity) during the Eemian, the cross-latitudinal, multi-proxy approach will also provide an improved oceanic data base to better constrain numerical climate models.