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Influence of tides on mass transport in the Bransfield Strait and the adjacent areas, Antarctic
Polar Science ( IF 1.8 ) Pub Date : 2020-01-25 , DOI: 10.1016/j.polar.2020.100506
Xiangqian Zhou , Guoping Zhu , Song Hu

The Bransfield Strait and the adjacent areas is a high-productivity region for polar biological resources in the Antarctic. Physical oceanographic processes produce strong ecosystem dynamics via mass transport and water exchange. However, few studies have focused on these processes from coast to shelf and across slopes by tidal dynamics. Therefore, a numerical model was implemented with a high resolution to simulate the influence of the tide on mass transport. The output of the model indicated that the tidal residual current produced by the diurnal tide is dominant and primarily distributed along with the shelf break and near the coast, and water stratification amplifies this residual current system. Water exchange processes were evaluated utilizing passive tracer dyes to demonstrate the influence of the tides on the channel and bay. The tracer residence time ranged from a few days to a week and was affected by the considered representative region's topography and area. Correspondingly, Lagrangian particles tracking method is also used to illustrate the mass transportation, which primarily move along the isobaths on the slope but spiral on the flat shelf. All experiments conducted herein indicate that tidal dynamics is indispensable in this region when studying cross-shelf mass transport.



中文翻译:

潮汐对南极布兰斯菲尔德海峡及其邻近地区的大众运输的影响

布兰斯菲尔德海峡及其邻近地区是南极极地生物资源的高产区。海洋物理过程通过大量运输和水交换产生强大的生态系统动力。但是,很少有研究通过潮汐动力学研究从海岸到陆架以及跨斜坡的这些过程。因此,实现了具有高分辨率的数值模型,以模拟潮汐对质量迁移的影响。该模型的输出表明,由日潮产生的潮汐剩余电流占主导地位,并且主要随着陆架断裂和海岸附近分布,而水分层则放大了该剩余电流系统。利用被动示踪染料评估了水交换过程,以证明潮汐对河道和海湾的影响。示踪剂的停留时间从几天到一周不等,并受认为具有代表性的地区的地形和面积的影响。相应地,拉格朗日粒子跟踪方法也被用来说明物质的运输,该运输主要沿着斜坡上的等值线移动,而在平坦的架子上呈螺旋形。本文进行的所有实验均表明,在研究跨架质量传输时,潮汐动力学在该区域必不可少。

更新日期:2020-01-25
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