Recirculation of Canada Basin Deep Water in the Amundsen Basin, Arctic

被引:2
作者
Karam, Salar [1 ]
Heuze, Celine [1 ]
Mueller, Vasco [2 ]
Zheng, Yixi [3 ]
机构
[1] Univ Gothenburg, Dept Earth Sci, Gothenburg, Sweden
[2] Helmholtz Zentrum Polar & Meeresforsch, Alfred Wegener Inst, Bremerhaven, Germany
[3] Univ East Anglia, Ctr Ocean & Atmospher Sci, Sch Environm Sci, Norwich, England
基金
欧盟地平线“2020”; 瑞典研究理事会; 欧洲研究理事会;
关键词
Ocean; Arctic; Boundary currents; Eddies; Intermediate waters; Water masses/storage; OCEAN BOUNDARY CURRENT; ATLANTIC WATER; MESOSCALE EDDIES; LOMONOSOV RIDGE; EURASIAN BASIN; BOTTOM WATER; FRAM STRAIT; ICE; HEAT; FLOW;
D O I
10.1175/JPO-D-22-0252.1
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
It is evident from hydrographic profiles in the Arctic Ocean that relatively warm and salty Canada Basin Deep Water (CBDW) flows over the Lomonosov Ridge into the Amundsen Basin, in the Eurasian Arctic. However, oceanographic data in the deep Arctic Ocean are scarce, making it difficult to analyze the spatial extent or the dynamics of this inflow. Here we present new hydrographic data from two recent expeditions as well as historical data from previous expeditions in the central Arctic. We use an end-member analysis to quantify the presence of CBDW in the Amundsen and Nansen Basins and infer new circulation pathways. We find that the inflow of CBDW is intermittent, and that it recir-culates in the Amundsen Basin along the Gakkel Ridge. Although the forcing mechanisms for the inflow of CBDW into the Amundsen Basin remain unclear owing to the lack of continuous observations, we demonstrate that density-driven overflows, even intermittent, and the pressure gradient across the Lomonosov Ridge are unlikely drivers. We also find multiple deep eddies with a CBDW content of up to 600 g kg21 and a vertical extent of up to 1200 m in the Amundsen Basin. The high CBDW content of these eddies suggests that they can efficiently trap CBDW and transport its heat and salt over long distances.
引用
收藏
页码:2559 / 2574
页数:16
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