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Systematic Bias in Baroclinic Energy Estimates in Shelf Seas

机译：货架海斜压能量估算中的系统性偏见

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摘要

A simple model of an internal wave advected by an oscillating barotropic flow suggests flaws in standard approaches to estimating properties of the internal tide. When the M-2 barotropic tidal current amplitude is of similar size to the phase speed of the M-2 baroclinic tide, spectral and harmonic analysis techniques lead to erroneous estimates of the amplitude, phase, and energy in the M-2 internal tide. In general, harmonic fits and bandpass or low-pass filters that attempt to isolate the lowest M-2 harmonic significantly underestimate the strength of M-2 baroclinic energy fluxes in shelf seas. Baroclinic energy flux estimates may show artificial spatial variability, giving the illusion of sources and sinks of energy where none are actually present. Analysis of previously published estimates of baroclinic energy fluxes in the Celtic Sea suggests this mechanism may lead to values being 25%-60% too low.
机译：由正压振荡流平移的内部波的简单模型表明，在估算内部潮汐特性的标准方法中存在缺陷。当M-2正压潮汐电流的大小与M-2斜压潮的相速度大小相似时，频谱和谐波分析技术会导致M-2内部潮汐的幅值，相位和能量的错误估计。通常，尝试拟合最低M-2谐波的谐波拟合和带通或低通滤波器会大大低估了架子海M-2斜压能量通量的强度。斜压能量通量估计值可能显示出人为的空间变异性，从而给人一种实际上不存在能量的源和汇的假象。先前对凯尔特海中斜压能量通量的估计值的分析表明，这种机制可能导致该值太低25％-60％。

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  • 来源
    《Journal of Physical Oceanography》 |2016年第9期|2851-2862|共12页
  • 作者

    Stephenson Gordon R. Jr.; Green J. A. Mattias; Inall Mark E.;

  • 作者单位

    Bangor Univ, Sch Ocean Sci, Menai Bridge LL59 5AB, Anglesey, Wales|Univ Southern Mississippi, Stennis Space Ctr, Hattiesburg, MS USA;

    Bangor Univ, Sch Ocean Sci, Menai Bridge LL59 5AB, Anglesey, Wales;

    Scottish Marine Inst, Scottish Assoc Marine Sci, Oban, Argyll, Scotland|Univ Edinburgh, Sch Geosci, Edinburgh, Midlothian, Scotland;

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