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首页> 外文期刊>Journal of Physical Oceanography >A Modeling Study of the Climatological Current Field and the Trajectories of Upwelled Particles in the East Australian Current
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A Modeling Study of the Climatological Current Field and the Trajectories of Upwelled Particles in the East Australian Current

机译：东澳大利亚洋流中气候流场和上升粒子运动轨迹的模型研究

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摘要

The climatological current field off the coast of New South Wales, Australia, is investigated using results from a field experiment and a diagnostic, numerical modeling study. In particular, the flow dynamics are examined near Smoky Cape (30°55'S) in the vicinity of the East Australian Current separation point. Modeled velocity fields compare favorably with observed velocity measurements that were obtained in this region during November 1998. An investigation of the role of advection in the alongshore momentum equation reveals that UV_x and VV_y change sign about the separation point, representing a shift in the flow regime from onshore advection and southward acceleration (north of the separation) to seaward advection and weaker southward currents (south of the separation). Bottom stress increases on the continental shelf downstream of the separation point, coincident with high horizontal divergence throughout the region. South of Smoky Cape, the near-bottom flow is characterized by a low Burger number, coincident with a subcritical Richardson number. These characteristics imply that the timescale in which bottom boundary layer shutdown occurs will be lengthened, enabling a persistent flow of potentially nutrient rich water into the coastal region. A series of Lagrangian particle tracking experiments designed to investigate the fate of the upwelled water are presented. Motivated by an observed chlorophyll-a maximum along the 25.25 σ_θ isopycnal, water of this density is used as a proxy for nutrient-enriched water. It is found that upwelled water originates at depth to the north of Smoky Cape and at times well offshore. South of Smoky Cape, coastal recirculations are evident, suggesting that upwelled water could be trapped in eddy fields adjacent to the coast and thus explaining why phytoplankton blooms are prevalent in the region south of Smoky Cape.
机译：利用田间实验和诊断性数值模拟研究的结果，对澳大利亚新南威尔士州沿海的气候当前场进行了调查。特别是，在东澳大利亚洋流分离点附近的黑烟岬（30°55'S）附近检查了流动动力学。建模的速度场与1998年11月在该地区获得的观测速度测量值相比具有优势。对流在沿岸动量方程中的作用的研究表明，UV_x和VV_y改变了分离点的符号，代表了流动状态的转变从陆上对流和向南加速（分离的北部）到海对流和较弱的南向洋流（分离的南部）。底部应力在分离点下游的大陆架上增加，与整个区域的高水平发散相吻合。在黑烟海角以南，近底流的特征是汉堡数低，与亚临界理查森数重合。这些特征意味着将延长发生底部边界层关闭的时间范围，从而使潜在的营养丰富的水持续流入沿海地区。提出了一系列拉格朗日粒子跟踪实验，旨在研究上升流水的命运。受观察到的叶绿素（沿25.25σ_θ等渗峰的最大值）的激发，该密度的水被用作富含营养物的水的替代物。发现上升流的水起源于Smoky Cape北部的深处，有时起源于近海。在黑烟海角以南，明显存在沿海回流，这表明上升的水可能被困在与海岸相邻的涡流场中，从而解释了为什么在黑烟海角以南的地区浮游植物繁盛。

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