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Observations of the Tasman Sea Internal Tide Beam

机译：塔斯曼海内潮梁的观测

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Low-mode internal tides, a dominant part of the internal wave spectrum, carry energy over large distances, yet the ultimate fate of this energy is unknown. Internal tides in the Tasman Sea are generated at Macquarie Ridge, south of New Zealand, and propagate northwest as a focused beam before impinging on the Tasmanian continental slope. In situ observations from the Tasman Sea capture synoptic measurements of the incident semidiurnal mode-1 internal-tide, which has an observed wavelength of 183 km and surface displacement of approximately 1 cm. Plane-wave fits to in situ and altimetric estimates of surface displacement agree to within a measurement uncertainty of 0.3 cm, which is the same order of magnitude as the non-stationary (not phase locked) mode-1 tide observed over a 40-day mooring deployment. Stationary energy flux, estimated from a plane-wave fit to the in situ observations, is directed toward Tasmania with a magnitude of 3.4 +/- 1.4 kW m(-1), consistent with a satellite estimate of 3.9 +/- 2.2 kW m(-1). Approximately 90% of the time-mean energy flux is due to the stationary tide. However, nonstationary velocity and pressure, which are typically 1/4 the amplitude of the stationary components, sometimes lead to instantaneous energy fluxes that are double or half of the stationary energy flux, overwhelming any spring-neap variability. Despite strong winds and intermittent near-inertial currents, the parameterized turbulent-kinetic-energy dissipation rate is small (i.e., 10(-10) W kg(-1)) below the near surface and observations of mode-1 internal tide energy-flux convergence are indistinguishable from zero (i.e., the confidence intervals include zero), indicating little decay of the mode-1 internal tide within the Tasman Sea.
机译：低模内部潮汐是内部波谱的主要部分，它在很长的距离内携带能量，但是这种能量的最终命运尚不得而知。塔斯曼海的内潮是在新西兰南部的麦格理岭产生的，并在向塔斯马尼亚大陆坡撞击之前作为聚焦光束向西北传播。塔斯曼海的实地观测捕获了入射半日模式1内潮的天气概况，该内潮的观测波长为183 km，表面位移约为1 cm。平面波拟合的原位和高度估计的表面位移在0.3 cm的测量不确定度内一致，这与在40天之内观察到的非平稳（非锁相）模式-1潮汐的数量级相同系泊部署。从平面波拟合到原位观测值估计出的固定能量通量以3.4 +/- 1.4 kW m（-1）的量指向塔斯马尼亚岛，与卫星估计的3.9 +/- 2.2 kW m一致（-1）。大约90％的时间平均能量通量归因于平稳的潮汐。但是，通常为固定分量振幅的1/4的非平稳速度和压力有时会导致瞬时能量通量是固定能量通量的两倍或一半，从而压倒了弹簧的任何可变性。尽管有强风和间歇性近惯性流，但参数化湍流动力学能量耗散率在近地面以下仍很小（即10（-10）W kg（-1）），并且观测到模式1内部潮汐能-通量收敛与零（即置信区间包括零）没有区别，这表明塔斯曼海内的1型内部潮汐几乎没有衰减。

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  • 来源
    《Journal of Physical Oceanography》 |2018年第6期|1283-1297|共15页
  • 作者

    Waterhouse Amy F.; Kelly Samuel M.; Zhao Zhongxiang; MacKinnon Jennifer A.; Nash Jonathan D.; Simmons Harper; Brahznikov Dmitry; Rainville Luc; Alford Matthew; Pinkel Rob;

  • 作者单位

    Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA;

    Univ Minnesota, Large Lakes Observ, Duluth, MN 55812 USA;

    Univ Washington, Appl Phys Lab, Seattle, WA 98105 USA;

    Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA;

    Oregon State Univ, Coll Ocean & Atmospher Sci, Corvallis, OR 97331 USA;

    Univ Alaska Fairbanks, Sch Fisheries & Ocean Sci, Fairbanks, AK USA;

    Univ Alaska Fairbanks, Sch Fisheries & Ocean Sci, Fairbanks, AK USA;

    Univ Washington, Appl Phys Lab, Seattle, WA 98105 USA;

    Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA;

    Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA;

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