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首页> 外文期刊>Journal of Physical Oceanography >Estimating Open-Ocean Barotropic Tidal Dissipation: The Hawaiian Ridge
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Estimating Open-Ocean Barotropic Tidal Dissipation: The Hawaiian Ridge

机译：估计海洋正压性潮汐耗散：夏威夷海岭

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The generalized inverse of a regional model is used to estimate barotropic tidal dissipation along the Hawaiian Ridge. The model, based on the linear shallow-water equations, incorporates parameterizations for the dissipation of energy via friction in the bottom boundary layer and form drag due to internal waves generated at topographic slopes. Sea surface height data from 364 orbit cycles of the Ocean Topography Experiment (TOPEX)/Poseidon satellite mission are used to perform inversions at eight diurnal and semidiurnal tidal frequencies. It is estimated that the barotropic M_2 tide loses energy at a rate of 19 GW, of which 88% is lost within 250 km of the ridge, presumably via conversion to the internal or baroclinic tide. Uncertainty in the assumed model error and wave drag in the forward model suggest that M_2 dissipation values from 18 to 25 GW are consistent with the altimetric observations. Other barotropic tidal constituents are estimated to lose a total of 5.7 GW. The spatial distribution of barotropic dissipation along the ridge is similar to that inferred from three-dimensional primitive equation models, and it is largely insensitive to details of assumed model and data errors. Dissipation at semidiurnal frequencies is most intense at the French Frigate Shoals with lesser, but significant, contributions at other sites. Diurnal tidal dissipation is concentrated to the east of the French Frigate Shoals, at the Gardner Pinnacles. Further work with three-dimensional models will be necessary to determine the fate of the energy that is removed from the barotropic tide.
机译：区域模型的广义逆用于估计沿夏威夷海脊的正压潮汐消散。该模型基于线性浅水方程，结合了参数化，可通过底部边界层中的摩擦耗散能量，并由于地形坡度产生的内部波而形成阻力。来自海洋地形实验（TOPEX）/波塞冬卫星任务的364个轨道周期的海面高度数据用于以八个昼夜和半昼间潮汐频率进行反演。据估计，正压M_2潮汐以19 GW的速率损失能量，其中88％的损失在山脊250 km之内，大概是通过转换为内部或斜压潮。假设的模型误差和前向模型中的波阻力的不确定性表明，从18到25 GW的M_2耗散值与高空观测值一致。其他正压潮汐成分估计总共损失5.7吉瓦。沿脊的正压耗散的空间分布与从三维原始方程模型推论的空间分布相似，并且对假设的模型细节和数据误差不敏感。在法国军舰浅滩，半昼夜频率的耗散最严重，而在其他地点的耗散较小，但影响很大。昼夜潮汐耗散集中在加德纳峰顶的法国护卫舰浅滩的东部。三维模型的进一步工作对于确定从正压潮中去除的能量的去向是必不可少的。

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