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Performance Evaluation of Parameterizations for Wind Input and Wave Dissipation in the Spectral Wave Model for the Northwest Atlantic Ocean

机译：西北大西洋光谱波模型风输入与波浪耗散参数的性能评价

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摘要

An ocean wave model for the northwest Atlantic Ocean based on WAVEWATCH III is used to evaluate four different source term packages (known as ST2, ST3, ST4, and ST6) for the wind input and wave dissipation. The performance of ST2, ST3, ST4, and ST6 is assessed using available measurements from buoy stations and satellite altimeters. The model results for significant wave height (H-s), mean wave period (T-m02), wave spectrum, wind input, and wave dissipation are examined during two periods: (i) winter storms in February and (ii) Hurricane Ophelia in September/October 2011. Analyses of model results demonstrate that ST4 and ST6 have the best performance with an average scatter index within 19.0% for H-s and T-m02 in the presence of strong currents and sea ice. These four packages perform differently under different sea states. Package ST6 generally overestimates H-s under the wind-wave-dominated sea states because of strong wind input and fast wave growth but underestimates H-s under swell-dominated sea states because of strong swell dissipation. The effects of ocean surface currents and sea ice on the wave model performance are also investigated. The linear kinematic effects of surface currents on waves can cause non-linear dynamic effects, which can differ among the four packages. Wave scattering in sea ice increases the wave directional spread and may cause an increase in H-s. In the presence of sea ice, wind input is reduced and shifted to higher frequencies and wave dissipation is further suppressed.
机译：基于Wavewatch III的西北大西洋海洋波模型用于评估用于风输入和波浪耗散的四个不同的源期封装（称为ST2，ST3，ST4和ST6）。使用来自浮标站和卫星高度计的可用测量来评估ST2，ST3，ST4和ST6的性能。在两个时期的两个时期检查了显着波高（HS），平均波期（T-M02），波谱，风输入和波浪耗散的模型/ 2011年10月。模型结果的分析表明，ST4和ST6在存在强大的电流和海冰的情况下，HS和T-M02的平均散射指数在19.0％内具有最佳性能。这四个包在不同的海区下表现不同。包ST6通常在风波主导的海状态下高估H-S，因为强烈的风输入和快速波长，但由于强烈的膨胀耗散，低估了H-S在膨胀主导的海洋状态下。还研究了海面电流和海冰对波模型性能的影响。表面电流对波的线性运动效应会导致非线性动态效应，这在四个封装中可能不同。海冰中的波浪散射增加了波浪方向扩散，可能导致H-S增加。在海冰的存在下，风输入减小并移位到较高的频率，并且进一步抑制了波浪耗散。

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