Nares Strait hydrography and salinity field from a 3-year moored array
Nares Strait hydrography and salinity field from a 3-year moored array
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三年系泊阵列的内雷斯海峡水文学和盐度场
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
H. Melling
中科院分区：
文献类型：
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作者：
B. Rabe;A. Münchow;H. Johnson;H. Melling
格陵兰岛西部的纳尔斯海峡促进了北极和大西洋之间的热量和淡水交换。本研究的重点是2003年至2006年部署的系泊阵列在Nares海峡的盐度、温度和密度测量。创新的系泊系统需要新颖的分析方法来测量80.5°N附近的海水特性，其间距足以解决内部Rossby变形半径。3年平均地转速度在海峡西侧有一个表面强化的向南流动0.20 m s - 1，在海峡中部有一个次级核向南流动0.14 m s - 1。数据显示，格陵兰岛一侧是温暖的咸水，埃尔斯米尔岛一侧是寒冷的淡水，尤其是在顶层。在海冰漂移和固定在陆地上的时期，水文结构有明显的不同。夏末、秋初和冬初海冰漂移，海峡中部有强烈的地表强化地转流。在冬末、春初和夏初，海峡西侧附近有一个强地转流的地下核，冰陆快速。盐度在时间和空间上的变化约为2psu，反映了北冰洋淡水流出量的变化。2005年7月底发生了一次特别强烈的脉冲。几天来，陡峭倾斜的等盐线表明海峡中部有强烈的地转流，与此同时，由于强劲的南风，北极的冰输出量增加。
[1] Nares Strait to the west of Greenland facilitates the exchange of heat and freshwater between the Arctic and Atlantic Oceans. This study focuses on salinity, temperature, and density measurements from Nares Strait from a mooring array deployed from 2003 to 2006. Innovative moorings requiring novel analysis methods measured seawater properties near 80.5°N, at spacing sufficient to resolve the internal Rossby deformation radius. The 3-year mean geostrophic velocity has a surface-intensified southward flow of 0.20 m s−1 against the western side of the strait and a secondary core flowing southward at 0.14 m s−1 in the middle of the strait. Data show warm salty water on the Greenland side and cold fresher water on the Ellesmere Island side, especially in the top layers. There was a clear difference in hydrographic structure between times when sea ice was drifting and when it was land fast. Ice was drifting in late summer, fall, and early winter with a strong surface-intensified geostrophic flow in the middle of the strait. Ice was land fast in late winter, spring, and early summer, when there was a subsurface core of strong geostrophic flow adjacent to the western side of the strait. Salinity variations of about 2 psu in time and space reflect a variable freshwater outflow from the Arctic Ocean. One particularly strong pulse occurred at the end of July 2005. For several days, steeply sloping isohalines indicated strong geostrophic flow down the middle of the strait coinciding with an amplified ice export from the Arctic due to strong southward winds.