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

过去 200 年来东格陵兰海流在北大西洋气候变化中的作用

基本信息

批准号：
235083862
负责人：
Dr. Kerstin Perner
金额：
--
依托单位：
Leibniz-Institut für Ostseeforschung Warnemünde (IOW)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/235083862?language=en
关键词：
role East Greenland Current North

项目摘要

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.

通过东格陵兰电流（EGC）出口极性淡水的变化会影响热盐的循环和亚极拍的强度，因此可以调节北大西洋的北向热传输。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化的关系，将在三个关键地点进行研究。在东格陵兰架（East Greenland Chanf）（东格陵兰电流的核心，Site1），北冰岛架子（SITE 2）和SE Greenland架子上的丹麦海峡，位于极地阵线区域。跨越过去和20世纪的古摄影数据集将首次以次级时间尺度生产EGC核心。这些基于有孔虫组合的详细研究，补充了位点和第3个位置的烯酮分析，将允许在EGC的漂流/海冰和淡水通量中表现出现代变暖的表现以及如何表现出来。为此，在2015年夏季的挪威RV G.O. SARS的巡游中将获得新的短沉积物核心。拟议的重建将与来自北大西洋漂移的海洋和陆地高分辨率研究有关，西部格陵兰岛电流，这是一项弗拉姆海峡，波罗的海和欧洲大陆，是为了调查自不同地区的冰河时代以来的时机（书内/相外）。重建EGC在高分辨率上的作用将增加我们对20世纪北大西洋地区气候变化潜在的触发机制的理解。