The Vertical Structure of Turbulence Kinetic Energy Near the Arctic Sea-Ice Surface

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geophysical Research Letters Pub Date : 2024-11-10 DOI:10.1029/2024GL110792

Shijie Peng, Qinghua Yang, Matthew D. Shupe, Bo Han, Dake Chen, Changwei Liu

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Abstract

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.

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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一直未得到充分研究。在本研究中，我们重点研究了海冰上空的湍流动能（TKE），并利用北极气候研究多学科漂流观测站（MOSAiC）考察期间的观测数据，区分了其两种不同的垂直结构，即 "表面 "型和 "高空 "型。地表 "型的最大 TKE 值在地表附近（2 米处），而 "高架 "型的最大 TKE 值在较高处（6 米处）。TKE 预算分析表明，"抬升 "类型是由于 6 米处的 TKE 受剪切力影响增大所致。此外，频谱分析表明，在 "抬升 "类型中，水平大涡对 TKE 的贡献增大。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。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.