Low-Frequency Currents and Continental Shelf Waves in the Southern Weddell Sea
Low-Frequency Currents and Continental Shelf Waves in the Southern Weddell Sea
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威德尔海南部的低频海流和大陆架波
DOI：
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发表时间：
1982
期刊：
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通讯作者：
A. Foldvik
中科院分区：
文献类型：
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作者：
J. Middleton;T. Foster;A. Foldvik
摘要 将对来自威德尔海南部大陆架和大陆坡的八个海流计记录进行分析所得到的低频海流波动的显著特征，与斜压和正压理论进行了比较。一种简单的内波斜压理论被成功地用于根据大陆坡系泊数据所做的低频速度椭圆计算来预测高频谱截止值。这一理论的成功表明，在大陆坡上观测到的比大陆架上更高的频谱能量水平可能是由于斜压运动。一个可能由圣吉利于1976年提出的自由大陆架波的正压模型根据当地地形进行了调整，并将该模型的预测结果与观测结果进行了比较。在沿大陆架方向相距10公里和160公里的系泊点之间的相干性和相位，为理论所预测的周期为3 - 60天以及最低……的大陆架波的存在提供了大量证据。
Abstract The salient features of low-frequency current fluctuations, obtained from an analysis of eight current meter records from the continental shelf and slope of the southern Weddell Sea, are compared to baroclinic and barotropic theories. A simple baroclinic theory of internal waves is used successfully to predict high-frequency spectral cutoff values from low-frequency velocity ellipse calculations made from the continental slope mooring data. The success of this theory indicates that the higher spectral energy levels observed over the slope compared to the shelf are probably due to baroclinic motions. A barotropic model of free continental shelf waves probably by Saint-Guily (1976) is adapted for the local topography and the predictions of the model compared to observations. Coherences and phases between moorings separated by 10 and 160 km in the along-shelf direction provide substantial evidence of the existence of shelf waves as predicted by the theory for periods of 3–60 days and for the lowest ...