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首页> 外文期刊>Journal of Physical Oceanography >Influence of Mass Diffusion in Sea Ice Dynamical Models
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Influence of Mass Diffusion in Sea Ice Dynamical Models

机译：物质扩散对海冰动力学模型的影响

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The mixing of floes of different thickness caused by repeated deformation of the ice cover is modeled as diffusion, and the mass balance equation for sea ice accounting for mass diffusion is developed. The effect of deformational diffusion on the ice thickness balance is shown to reach 1% of the divergence effect, which describes ridging and lead formation. This means that with the same accuracy the mass balance equation can be written in terms of mean velocity rather than mean mass-weighted velocity, which one should correctly use for a multicomponent fluid such as sea ice with components identified by floe thickness. Mixing (diffusion) of sea ice also occurs because of turbulent variations in wind and ocean drags that are unresolved in models. Estimates of the importance of turbulent mass diffusion on the dynamic redistribution of ice thickness are determined using empirical data for the turbulent diffusivity. For long-time-scale prediction (5 days), where unresolved atmospheric motion may have a length scale on the order of the Arctic basin and the time scale is larger than the synoptic time scale of atmospheric events, turbulent mass diffusion can exceed 10% of the divergence effect. However, for short-time-scale prediction, for example, 5 days, the unresolved scales are on the order of 100 km, and turbulent diffusion is about 0.1% of the divergence effect. Because inertial effects are small in the dynamics of the sea ice pack, diffusive momentum transfer can be disregarded.
机译：将由冰盖的反复变形引起的不同厚度的絮凝物的混合建模为扩散，并建立了考虑质量扩散的海冰质量平衡方程。变形扩散对冰厚度平衡的影响已显示达到发散效应的1％，这说明了褶皱和铅的形成。这意味着，以相同的精度，质量平衡方程式可以用平均速度而不是平均质量加权速度来表示，对于诸如海冰之类的多组分流体，应正确地使用该组分，其絮凝物厚度可以确定。由于风和海洋阻力的湍流变化（模型中未解决），海冰也发生混合（扩散）。使用湍流扩散率的经验数据确定湍流质量扩散对冰厚度动态重新分布的重要性的估算值。对于长时间尺度的预报（ 5天），未解决的大气运动的长度尺度可能约为北极盆地，并且该时间尺度大于大气事件的天气尺度，那么湍流质量扩散可能会超过10％的发散效果。但是，对于短时尺度预报（例如5天），未解决的尺度约为100 km，湍流扩散约为发散效应的0.1％。由于在海冰袋的动力学中惯性效应很小，因此可以忽略扩散动量传递。

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