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Propagation of the internal tide from the Hawaiian Ridge.

机译:夏威夷海脊内潮的传播。

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摘要

A study of the internal wave field generated by the tide around the Hawaiian Ridge is presented. To examine the processes controlling the generation, the evolution, and ultimately the dissipation of the internal tide, a new data set consisting of high-resolution density and velocity measurements recorded from the Research Platform FLIP is analyzed. As part of the Hawaiian Ocean Mixing Experiment, FLIP was moored for 2 six-weeks deployments: 450 km southwest of Oahu in 2001 (Farfield Program), and in the Kauai Channel in 2002 (Nearfield Program).; The variability of internal wave field as function of time, depth, and temporal frequency is described. The semidiurnal internal tide is found to be surprisingly variable in space as well as in time. Several internal wave beams at the dominant tidal frequencies are resolved in the Nearfield. In the Farfield, the internal tide is almost exclusively mode 1.; Cross-spectral techniques are used to compute the energy flux directly from the observations, both in terms of temporal frequencies and vertical wavenumbers (or modes). The M2 internal tide energy flux dominates the spectrum by an order of magnitude in both sites. Higher harmonics, virtually absent in the Nearfield, carry significant energy away from the Ridge in the Farfield. In both cases, there are also large fluxes associated with higher mode waves at frequency M2/2, indicating that nonlinear interactions rapidly transfer energy across the spectrum.; The mechanisms affecting the propagation of the low-mode internal tide in the ocean are discussed using a ray model. In addition to latitude, stratification, and depth, the mesoscale currents (derived from satellite altimetry) are shown to be a dominant factor affecting the paths, travel speeds, and the phases of all modes. The mesoscale field makes modes 3 and higher completely incoherent within a few tens of km from their source. Altimetric measurements of the sea-surface manifestation of the internal tide are interpreted. The M2 internal tide does not seem to lose much energy as it propagates southward, but its phase rapidly becomes random. The northward propagating internal tide should remain phase-locked but appears to rapidly lose energy.
机译:对夏威夷海岭周围潮汐产生的内部波场进行了研究。为了检查控制内部潮汐的发生,演变和最终消散的过程,分析了一个新的数据集,该数据集由从Research Platform FLIP记录的高分辨率密度和速度测量组成。作为夏威夷大洋混合实验的一部分,FLIP被停泊了两个六周的时间:2001年在瓦胡岛西南450公里处(Farfield计划),以及2002年在考艾海峡(Nearfield计划)。描述了内部波场随时间,深度和时间频率的变化。发现半日内潮在空间和时间上都出乎意料地变化。在近场中,几个具有主要潮汐频率的内部光束被分解。在Farfield,内部潮流几乎完全是模式1;互谱技术用于直接从观测值计算能量通量,包括时间频率和垂直波数(或模)。 M2内部潮汐能通量在两个位置上都以一个数量级控制频谱。近场几乎不存在的高次谐波将大量能量从远场的山脊带走。在这两种情况下,在M2 / 2频率处还有与高模波相关的大通量,这表明非线性相互作用迅速在整个频谱上传递能量。使用射线模型讨论了影响低模内部潮汐在海洋中传播的机制。除纬度,分层和深度外,中尺度电流(来自卫星测高仪)被证明是影响所有模式的路径,行进速度和相位的主要因素。中尺度场使模式3和更高的模式在距其源头几十公里的范围内完全不相干。解释了内部潮汐海面表现的高度测量。 M2内部潮汐向南传播时似乎并没有损失太多能量,但是其相位迅速变为随机的。向北传播的内潮应保持锁相,但似乎会迅速失去能量。

著录项

  • 作者

    Rainville, Luc.;

  • 作者单位

    University of California, San Diego.;

  • 授予单位 University of California, San Diego.;
  • 学科 Physical Oceanography.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 161 p.
  • 总页数 161
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋物理学;
  • 关键词

  • 入库时间 2022-08-17 11:44:03

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