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首页> 外文期刊>Journal of Physical Oceanography >Evolution of Directional Wave Spectra in the Marginal Ice Zone: A New Model Tested with Legacy Data
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Evolution of Directional Wave Spectra in the Marginal Ice Zone: A New Model Tested with Legacy Data

机译：边缘冰区定向波谱的演变：用遗留数据测试的新模型

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摘要

Field experimental data from a 1980s program in the Greenland Sea investigating the evolution of directional wave spectra in the marginal ice zone are reanalyzed and compared with the predictions of a new, phase-resolving, three-dimensional model describing the two-dimensional scattering of the waves by the vast number of ice floes that are normally present. The model is augmented with a dissipative term to account for the nonconservative processes affecting wave propagation. Observations reported in the experimental study are used to reproduce the ice conditions and wave forcing during the experiments. It is found that scattering alone underestimates the attenuation experienced by the waves during their passage through the ice field. With dissipation, however, the model can replicate the observed attenuation for most frequencies in the swell regime. Model predictions and observations of directional spreading are in agreement for short to midrange wave periods, where the wave field quickly becomes isotropic. For larger wave periods, little spreading can be seen in the model predictions, in contrast to the isotropic or near-isotropic seas reported in the experimental study. The discrepancy is conjectured to be a consequence of the inaccurate characterization of the ice conditions in the model and experimental errors.
机译：重新分析了1980年代格陵兰海计划调查边缘冰区定向波谱演变的实地实验数据，并将其与描述相变二维散射的新的相分辨三维模型的预测结果进行了比较。通常存在的大量浮冰会产生波浪。该模型增加了耗散项，以解决影响波传播的非保守过程。实验研究中报告的观察结果用于再现实验过程中的冰况和波浪强迫。已经发现，单独的散射低估了波浪在穿过冰原期间经历的衰减。但是，通过耗散，该模型可以复制在浪涌状态下大多数频率下观察到的衰减。在中短波期间，波场迅速变为各向同性，模型预测和定向扩展的观测结果是一致的。对于较大的波浪周期，与实验研究中报告的各向同性或近等向海相反，在模型预测中几乎看不到扩展。推测该差异是由于模型中冰况的不正确表征和实验误差造成的。

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  • 来源
    《Journal of Physical Oceanography》 |2016年第10期|3121-3137|共17页
  • 作者

    Squire Vernon A.; Montiel Fabien;

  • 作者单位

    Univ Otago, Dept Math & Stat, Sci 3 Bldg,730 Cumberland St, Dunedin 9016, New Zealand;

    Univ Otago, Dept Math & Stat, Sci 3 Bldg,730 Cumberland St, Dunedin 9016, New Zealand;

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