Landfast Ice Controls on Turbulence in Antarctic Coastal Seas
Landfast Ice Controls on Turbulence in Antarctic Coastal Seas
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DOI：
10.1029/2021jc017963
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发表时间：
2022-01-01
影响因子：
3.6
通讯作者：
Reed, Sarah
中科院分区：
文献类型：
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作者：
Inall, Mark E.;Brearley, J. Alexander;Reed, Sarah
对南极陆地坚冰下面的海洋表层的了解很少。在这篇文章中，在南极西部半岛的同一位置，在有和没有固定冰的情况下，对近地层湍流和精细结构进行了定量分析。陆固冰减少湍流水平局部的数量级小于无冰值，近惯性能量和亚惯性潮汐能水平小于一半的无冰值。垂直湍流热量和养分通量分别比先前估计的高6倍和10倍。在整个南极大陆架上，由于季节性的陆地固定冰覆盖，冰下潮汐能的耗散估计在788兆瓦到6吉瓦之间。在海洋表面的风产生的湍流的总速率大大减少了季节性陆地坚冰的存在，平均为14%的无冰值，但与大部门的变化。然而，与直觉相反的是，潮汐和风对南极海岸线和最大陆固冰范围之间的上层海洋湍流动能预算的贡献大致相等，由于正压潮汐强度的地理变化，存在较大的部门变化。
Knowledge of the ocean surface layer beneath Antarctic landfast ice is sparse. In this article surface layer turbulent and fine structure are quantified with and without landfast ice at the same West Antarctic Peninsula location. Landfast ice reduced turbulence levels locally to an order of magnitude less than ice-free values, and near-inertial energy and sub-inertial tidal energy levels to less than half their ice-free values. Vertical turbulent heat and nutrient fluxes were, respectively, 6 and 10 times greater than previously estimated. Under-ice tidal energy dissipation over the entire Antarctic continental shelf due to seasonal landfast ice cover is estimated to be between 788 MW to similar to 6 GW. The total rate of wind-generated turbulence in the surface ocean is greatly reduced by the presence of seasonal landfast ice to an average of 14% of the ice-free value, but with large sectoral variations. Counter-intuitively, however, tides and wind contribute approximately equally to the turbulent kinetic energy budget of the upper ocean between the Antarctic coastline and the maximal landfast ice extent, with large sectoral variations, attributed to geographic variations in the strength of the barotropic tide.