A barotropic model of the currents off SE South America
A barotropic model of the currents off SE South America
复制标题
南美洲东南部洋流的正压模型
DOI：
10.1029/95jc00942
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发表时间：
1995
影响因子：
--
通讯作者：
R. Flather
中科院分区：
文献类型：
--
作者：
P. Glorioso;R. Flather
在以55°W子午线、56°S纬线和南美洲东南海岸为界的区域，采用了一个13公里网格分辨率的深度平均数值模式。该区域的特点是生物生产力高，以及与亚极福克兰/马尔维纳斯(FM)洋流相互作用的特殊潮汐制度。所介绍的结果有助于开发一个生态水动力系统，旨在研究该区域自然资源日益开采所产生的影响。详细的潮汐图显示了与南大西洋顺时针圆环有关的潮汐波在大陆架上的传播，表明发生了共振。平均速度场以FM流为主，尽管在巴塔哥尼亚海岸海角附近的潮汐残差很大。相反，“快照”描述了潮汐和FM海流之间的相互作用，所显示的水流模式预计会影响生物物种的种群动态。平均风应力在火地岛东北部引发了强流和一个大的逆时针环流单体。强大的潮汐和FM流产生了陆架海锋，其位置由Simpson-Hunter参数的等高线揭示，与主要渔场有关。由于该地区缺乏风速测量，模式模拟的调频海流和风生海流应作为实验结果，直至与观测值进行适当比较。
A depth-averaged numerical model with 13-km grid resolution was applied to the region defined by the 55°W meridian, the 56°S parallel and the southeast coast of South America. This region is characterized by high biological productivity, and by an exceptional tidal regime that interacts with the subpolar Falkland/Malvinas (FM) current. The results presented contribute to the development of an ecohydrodynamic system intended for the study of the implications of increasing exploitation of natural resources in the region. Detailed tidal charts show the propagation on the continental shelf of tidal waves related to clockwise amphidromes in the South Atlantic, indicating the occurrence of resonance. The averaged velocity field is dominated by the FM current, although tidal residuals around headlands are significant on the Patagonian coast. In contrast, “snapshots” describe the interaction between the tides and the FM current, where the flow patterns displayed are expected to influence the population dynamics of biological species. The mean wind stress induces strong currents and a large anticlockwise circulation cell northeast of Tierra del Fuego. The strong tidal and FM currents generate shelf sea fronts whose locations, revealed by contours of the Simpson-Hunter parameter, are related to major fishing grounds. Because of the lack of velocity measurements in the region, the FM and wind-driven currents simulated by the model should be taken as experimental results until proper comparisons with observations can be made.