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首页> 外文期刊>Journal of Physical Oceanography >Ocean Surface Wave Spectra inside Tropical Cyclones
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Ocean Surface Wave Spectra inside Tropical Cyclones

机译：热带气旋内的海洋表面波谱

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摘要

Directional wave spectra acquired in hurricane reconnaissance missions are compared with wind-wave spectral models. The comparison result is quantified with two indices of model-measurement spectral agreement. In the main region of hurricane coverage, the indices vary sinusoidally with the azimuth angle referenced to the hurricane heading while showing a weak dependence on the radial distance from the hurricane center. The measured spectra agree well with three models evaluated in the back and right quarters, and they are underdeveloped in the front and left quarters. The local wind and wave directions also show a weak radial dependence and sinusoidal variation along the azimuth. The wind and wave vectors are almost collinear in the back and right quarters; they diverge azimuthally and become almost perpendicular in the left quarter. The azimuthally cyclical correlation between the indices of spectral agreement and the wind-wave directional difference is well described by the sinusoidal variations. Also discussed is the wide range of the spectral slopes observed in both hurricane and nonhurricane field data. It is unlikely that the observed spectral slope variation is caused by Doppler frequency shift from background currents. No clear correlation is found between spectral slope and various wind and wave parameters. The result suggests that the spectral slope needs to be treated as a stochastic random variable. Complementing the existing wind-wave spectral models that prescribe a fixed spectral slope of either -4 or -5, a general spectral model with its spectral parameters accommodating a variable spectral slope is introduced.
机译：将在飓风侦察任务中获得的定向波谱与风波谱模型进行比较。比较结果用模型测量光谱一致性的两个指标量化。在飓风覆盖的主要区域中，指数相对于飓风航向的方位角呈正弦变化，但对离飓风中心的径向距离的依赖性较小。测得的光谱与在后四分之一和右四分之一中评估的三个模型非常吻合，并且在前四分之一和左四分之一中它们是不发达的。局部风浪方向也显示出较弱的径向依存性和沿方位角的正弦变化。在后四分之一和右四分之一处，风和波矢量几乎是共线的。它们沿方位角发散，并在左四分之一处几乎垂直。正弦变化很好地描述了频谱一致性指数和风波方向差之间的方位角周期性相关性。还讨论了在飓风和非飓风现场数据中观察到的宽光谱斜率范围。观察到的频谱斜率变化不太可能是由于多普勒频移与背景电流引起的。在频谱斜率与各种风浪参数之间未发现明显的相关性。结果表明，频谱斜率需要视为随机随机变量。补充现有的风波光谱模型，该模型规定了-4或-5的固定光谱斜率，引入了通用光谱模型，其光谱参数可容纳可变光谱斜率。

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  • 来源
    《Journal of Physical Oceanography》 |2017年第10期|2393-2417|共25页
  • 作者

    Hwang Paul A.; Fan Yalin; Ocampo-Torres Francisco J.; Garcia-Nava Hector;

  • 作者单位

    Naval Res Lab, Remote Sensing Div, Washington, DC 20375 USA;

    Naval Res Lab, Div Oceanog, Stennis Space Ctr, MS USA;

    Ctr Invest Cient & Educ Super Ensenada, Dept Oceanog Fis, Ensenada, Baja California, Mexico;

    Univ Autonoma Baja California, Inst Invest Oceanol, Ensenada, Baja California, Mexico;

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