On the calculation of an attenuation coefficient for transects of ice-covered ocean
On the calculation of an attenuation coefficient for transects of ice-covered ocean
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DOI：
10.1098/rspa.2011.0155
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发表时间：
2012-01-08
影响因子：
3.5
通讯作者：
Squire, Vernon A.
中科院分区：
文献类型：
--
作者：
Bennetts, Luke G.;Squire, Vernon A.
极地海冰覆盖区域的海洋表面波的指数衰减是在二维线性环境中模拟的，假定海冰表现为薄弹性板。衰减是由冰盖中的自然特征产生的，考虑了三种类型：浮冰、裂缝和压力脊。文中还引入了非弹性阻尼法。寻求用于获得每类特征的衰减系数的有效方法，包括对波相互作用理论和平均方法的研究。结果表明：(I)长浮冰产生的衰减可以由单个冰边的散射特性得到；(Ii)冰盖区域的波相互作用理论要求当散射源相对较近时，考虑瞬变运动和衰减传播运动。还讨论了将该模式集成到海洋环流模式中的意义。
Exponential attenuation of ocean surface waves in ice-covered regions of the polar seas is modelled in a two-dimensional, linear setting, assuming that the sea ice behaves as a thin-elastic plate. Attenuation is produced by natural features in the ice cover, with three types considered: floes, cracks and pressure ridges. An inelastic damping parameterization is also incorporated. Efficient methods for obtaining an attenuation coefficient for each class of feature, involving an investigation of wave interaction theory and averaging methods, are sought. It is found that (i) the attenuation produced by long floes can be obtained from the scattering properties of a single ice edge; and (ii) wave interaction theory in ice-covered regions requires evanescent and damped-propagating motions to be included when scattering sources are relatively nearby. Implications for the integration of this model into an oceanic general circulation model are also discussed.