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Significant dissipation of tidal energy in the deep ocean inferred from satellite altimeter data

机译:根据卫星高度计数据推断,深海中的潮汐能显着耗散

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摘要

How and where the ocean tides dissipate their energy are longstanding questions that have consequences ranging from the history of the Moon to the mixing of the oceans. Historically, the principal sink of tidal energy has been thought to be bottom friction in shallow seas. There has long been suggestive evidence, however, that tidal dissipation also occurs in the open ocean through the scattering by ocean-bottom topography of surface tides into internal waves, but estimates of the magnitude of this possible sink have varied widely. Here we use satellite altimeter data from Topex/Poseidon to map empirically the tidal energy dissipation. We show that approximately 10~(12) watts—that is, 1 TW, representing 25-30% of the total dissipation—occurs in the deep ocean, generally near areas of rough topography. Of the estimated 2 TW of mixing energy required to maintain the large-scale thermohaline circulation of the ocean, one-half could therefore be provided by the tides, with the other half coming from action on the surface of the ocean.
机译:长期以来,海洋潮汐如何消散能量以及在何处消散能量,这些问题的影响范围从月球的历史到海洋的融合。从历史上看,潮汐能的主要汇流被认为是浅海中的底部摩擦。但是,长期以来一直有暗示性的证据表明,在公海中,潮汐的消散也通过海底地形将潮汐散射到内部波中而发生在开放海洋中,但是对这种可能下沉的大小的估计差异很大。在这里,我们使用来自Topex / Poseidon的卫星高度计数据凭经验绘制潮汐能耗散图。我们显示大约10瓦(12)瓦,即1 TW,占总耗散功率的25-30%,发生在深海中,通常是在地形粗糙的区域附近。维持海洋大规模热盐循环所需的估计2 TW混合能量中,潮汐可提供一半,而另一半则来自海洋表面的作用。

著录项

  • 来源
    《Nature》 |2000年第6788期|p.775-778|共4页
  • 作者

    G. D. Egbert; R. D. Ray;

  • 作者单位
  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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