Atmospheric turbulence over the Arctic sea-ice surface has been understudied due to the lack of observational data. In this study, we focus on the turbulence kinetic energy (TKE) over sea ice and distinguish its two different vertical structures, the “Surface” type and the “Elevated” type, using observations during the Multidisciplinary drifting Observatory for the Study of Arctic Climate expedition (MOSAiC). The “Surface” type has the maximum TKE near the surface (at 2 m), while the “Elevated” type has the maximum TKE at a higher level (6 m). The TKE budget analysis indicates that the “Elevated” type is caused by the increased shear production of TKE at 6 m. In addition, spectral analysis reveals that the contribution to TKE by horizontal large eddies is enhanced in the “Elevated” type. Finally, how the vertical structure of TKE affects the parameterization of turbulent momentum flux is discussed.

中文翻译：

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北极海冰表面附近湍流动能的垂直结构


由于缺乏观测数据，北极海冰表面的大气湍流研究不足。在这项研究中，我们关注海冰上的湍流动能 （TKE），并使用北极气候研究多学科漂流天文台 （MOSAiC） 期间的观测来区分其两种不同的垂直结构，即“表面”型和“高架”型。“Surface” 型在靠近表面（2 m 处）的 TKE 最大，而“Eliftated”型在较高层（6 m）具有最大 TKE。TKE 预算分析表明，“高架”型是由于 TKE 在 6 m 处的剪切产生增加引起的。此外，光谱分析表明，水平大涡流对 TKE 的贡献在“高架”类型中增强。最后，讨论了 TKE 的垂直结构如何影响湍流动量通量的参数化。