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Lateral tidal mixing in the Antarctic marginal seas

机译:南极边缘海的横向潮汐混合

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摘要

Tidal mixing plays an important role in the modification of dense water masses around the Antarctic continent. In addition to the vertical (diapycnal) mixing in the near-bottom layers, lateral mixing can also be of relevance in some areas. A numerical tide simulation shows that lateral tidal mixing is not uniformly distributed along the shelf break. In particular, strong mixing occurs all along the Ross Sea and Southern Weddell Sea shelf breaks, while other regions (e.g., the western Weddell Sea) are relatively quiet. The latter regions correspond surprisingly well to areas where indications for cross-shelf exchange of dense water masses have been found. The results suggest that lateral tidal mixing may account for the relatively small contribution of Ross Sea dense water masses to Antarctic Bottom Water.
机译:潮汐混合在南极大陆周围稠密水团的改变中起着重要作用。除了在接近底部的层中进行垂直(对向)混合外,在某些区域中横向混合也很重要。潮汐数值模拟表明,沿潮汐带的横向潮汐混合不均匀。特别是,在罗斯海和南部韦德尔海陆架断裂处一直发生强烈的混合,而其他地区(例如韦德尔海西部)则相对安静。后面的区域出乎意料地很好地对应于已经发现密集水团跨架交换的迹象的区域。结果表明,横向潮汐混合可能解释了罗斯海浓水团对南极底水的贡献相对较小。

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