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首页> 外文期刊>Journal of Physical Oceanography >Impact of Thermally Driven Turbulence on the Bottom Melting of Ice
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Impact of Thermally Driven Turbulence on the Bottom Melting of Ice

机译：热驱动湍流对冰底融化的影响

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Direct numerical simulation and laboratory experiments are used to investigate turbulent convection beneath a horizontal ice-water interface. Scaling laws are derived that quantify the dependence of the melt rate of the ice on the far-field temperature of the water under purely thermally driven conditions. The scaling laws, the simulations, and the laboratory experiments consistently yield that the melt rate increases by two orders of magnitude, from ?10(1) to ?10(3) mm day(-1), as the far-field temperature increases from 4 degrees to 8 degrees C. The strong temperature dependence of the melt rate is explained by analyzing the vertical structure of the flow: For far-field temperatures below 8 degrees C, the flow features a stably stratified, diffusive layer next to the ice that shields it from the warmer, turbulent outer layer. The stratification in the diffusive layer diminishes as the far-field temperature increases and vanishes for far-field temperatures far above 8 degrees C. Possible implications of these results for ice-ocean interfaces are discussed. The drastic melt-rate increase implies that turbulence needs to be considered in the analysis of ice-water interfaces even in shear-free conditions.
机译：直接数值模拟和实验室实验用于研究水平冰水界面下的湍流对流。得出定标定律，该定律量化了在纯热驱动条件下，冰的融化速率对水的远场温度的依赖性。缩放定律，模拟和实验室实验一致地得出结论，随着远场温度的升高，熔融速率从？10（1）到？10（3）mm天（-1）增加了两个数量级。从4摄氏度到8摄氏度。融化速率对温度的强烈依赖性通过分析流的垂直结构来解释：对于低于8摄氏度的远场温度，流在冰旁边具有稳定的分层扩散层使它免受温暖，动荡的外层影响。随着远场温度的升高，扩散层中的分层逐渐减少，远场温度远高于8摄氏度时消失，消失了。讨论了这些结果对冰-海洋界面的潜在影响。急剧的融化速度增加意味着即使在无剪切条件下，在冰水界面分析中也需要考虑湍流。

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