Topographic enhancement of tidal motion in the western Barents Sea
Topographic enhancement of tidal motion in the western Barents Sea
复制标题
巴伦支海西部潮汐运动的地形增强
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
A. Proshutinsky
中科院分区：
文献类型：
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作者：
Z. Kowalik;A. Proshutinsky
一个高分辨率的数值网格被用来研究地形被困运动周围的岛屿和浅滩的巴伦支海西部半日和全日潮波所造成的。熊岛附近的观测和模式计算表明，发展良好的捕获运动与独特的潮汐振荡运动。数值研究表明，在浅地形上的潮流整流是被困运动的来源之一。潮汐运动支持熊岛和斯匹次卑尔根浅滩周围约8 cm s−1的余流。由于地形放大作用，半日分潮的增强结构产生于浅水区。在日振荡带中，最大海流与陆架波的出现有关。剩余电流由于昼夜潮汐发生在浅水区和陆棚斜坡的最大地形梯度的区域。周日流增强的表面表现是在5 - 10 cm量级的陆架坡折处的局部最大潮幅。在熊岛和斯匹次卑尔根银行地区，潮流增强和潮汐产生的余流导致产生更多的冰铅、冰脊和浮冰的受困运动。
A high-resolution numerical lattice is used to study a topographically trapped motion around islands and shallow banks of the western Barents Sea caused both by the semidiurnal and diurnal tidal waves. Observations and model computations in the vicinity of Bear Island show well-developed trapped motion with distinctive tidal oscillatory motion. Numerical investigations demonstrate that one source of the trapped motion is tidal current rectification over shallow topography. Tidal motion supports residual currents of the order of 8 cm s−1 around Bear Island and shallow Spitsbergenbanken. The structures of enhanced tidal currents for the semidiurnal components are generated in the shallow areas due to topographic amplification. In the diurnal band of oscillations the maximum current is associated with the shelf wave occurrence. Residual currents due to diurnal tides occur at both the shallow areas and the shelf slope in regions of maximum topographic gradients. Surface manifestation of the diurnal current enhancement is the local maximum of tidal amplitude at the shelf break of the order of 5 to 10 cm. Tidal current enhancement and tidally generated residual currents in the Bear Island and Spitsbergenbanken regions cause an increased generation of ice leads, ridges and, trapped motion of the ice floes.