The role of the East Greenland Current in the North Atlantic climate variability during the last 200 years

通过东格陵兰海流（EGC）的极地淡水输出的变化可以影响温盐环流和副极地环流的强度，因此，可以调节北大西洋向北的热量输送。为了评估EGC在20世纪变暖中的作用及其与北大西洋气候变率的关系，将在三个关键地点研究EGC的古海洋学历史和空间范围：东格陵兰大陆架中部（东格陵兰海流核心，地点1）、北冰岛大陆架（地点2）和格陵兰东南大陆架上的丹麦海峡，以及极锋地区。这是第一次，古海洋学数据集，跨越最近的过去和世纪，为EGC核心，将产生在一个亚十年的时间尺度。这些详细的研究有孔虫组合的基础上，辅以烯酮分析在网站2和3，将允许评估现代变暖是否以及如何表现在漂移/海冰和淡水通量的EGC。为此目的，将在挪威考察船G.O.的巡航期间获取新的短沉积物岩心。2015年夏天的SARS。拟议的重建将与来自北大西洋漂移、西格陵兰海流、弗拉姆海峡、波罗的海和欧洲大陆的海洋和陆地高分辨率研究相联系，以调查不同区域自小冰期以来的时间（同相/异相）。在高分辨率下重建EGC的作用将增加我们对20世纪北大西洋地区气候变率触发机制的理解。

Variations in polar freshwater export via the East Greenland Current (EGC) can affect thermohaline circulation and the strength of the Subpolar Gyre and, therefore, can modulate the northward heat transport in the North Atlantic Ocean. To assess the role of the EGC in the 20th century warming and its relation to North Atlantic climate variability, its palaeoceanographic history and spatial extent will be studied at three key sites; on the central East Greenland shelf (core of the East Greenland Current, site1), the North Iceland shelf (site 2) and the Denmark Strait on the SE Greenland shelf, in the area of the Polar Front. For the first time, palaeoceanographic data sets, spanning the most recent past and the 20th century, for the EGC core will be produced at a sub-decadal time scale. These detailed studies based on foraminiferal assemblages, supplemented with alkenone analyses at site 2 and 3, will allow to asses if and how modern warming is manifested in drift/sea ice and freshwater flux of the EGC. For this aim, new short sediment cores will be obtained during a cruise of the Norwegian RV G.O. Sars in summer 2015. The proposed reconstructions will be linked to marine and terrestrial high-resolution studies from the North Atlantic Drift, the West Greenland Current, the Fram Strait, the Baltic Sea and continental Europe, in order to investigate the timing (in-phase/out-of-phase) since the Little Ice Age in the different regions. Reconstructing the role of the EGC at high resolution will increase our understanding of trigger mechanisms underlying climate variability in the North Atlantic region during the 20th century.