Reconstructing Arctic-Atlantic Interactions on a Sub-millennial Time Scale: Holocene Sediment Records from the Southeastern Barents Sea

将研究巴伦支海东南部的全新世古环境，以跟踪世纪至年代际尺度上水和海冰特征的过去变化。 北极自然系统正在发生的显著变化需要更好地了解控制这种变化的机制。 特别是，必须从长期角度评估北极-大西洋气候相互作用的变化。 巴伦支海已被确定为调查这些变化的关键区域。 在北极和大西洋区域之间有一个明显的大气和水文边界穿过巴伦支海，其底部沉积物记录了这一边界位置的波动。 选定的沉积物岩心，最近收集在巴伦支海东南部地区的高沉积速率，将调查古生物，矿物，粒度和地球化学成分。 获得的代用数据将允许估计全新世的地表和底层水的温度和盐度，海冰条件和环流模式的变化。 岩心地层将受到选定钙质动物遗骸AMS 14 C测年的时间限制。 预计在巴伦支海的分辨率为100-120年，在邻近的科拉湾可达30-50年。 研究结果将检验北极-大西洋相互作用是否存在长期波动，这是了解现代北极气候变化的基石。

Holocene paleo-environments from the southeastern Barents Sea will be studied to track past changes in water and sea-ice characteristics on a century to interdecadal scale. Noticeable ongoing changes in the Arctic natural system require better understanding of mechanisms controlling this change. In particular, it is critical to assess variations in Arctic-Atlantic climatic interactions in a long-term perspective. The Barents Sea has been identified as a key area for investigating these variations. A distinct atmospheric and hydrographic boundary between Arctic and Atlantic domains crosses the Barents Sea, and its bottom sediments record fluctuations in the position of this boundary. Selected sediment cores, recently collected in the southeastern Barents Sea in areas with elevated sedimentation rates, will be investigated for paleobiological, mineralogical, grain-size, and geochemical composition. Obtained proxy data will allow the estimation of Holocene variations in surface and bottom water temperatures and salinities, sea-ice conditions, and circulation patterns. Core stratigraphy will be time-constrained by AMS 14C dating of selected calcareous faunal remains. A resolutions of 100-120 yr is expected in the open Barents Sea, and up to 30-50 yr in the adjacent Kola Bay. The study results will test the existence of long-term fluctuations in Arctic-Atlantic interactions, a cornerstone for understanding modern Arctic climatic changes.