Submesoscale Fronts in the Antarctic Marginal Ice Zone and Their Response to Wind Forcing
Submesoscale Fronts in the Antarctic Marginal Ice Zone and Their Response to Wind Forcing
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南极边缘冰带的亚中尺度锋及其对风强迫的响应
DOI：
10.1029/2019gl086649
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发表时间：
2020-03
影响因子：
5.2
通讯作者：
S. Swart;M. D. Plessis;A. Thompson;L. Biddle;I. Giddy;T. Linders;M. Mohrmann;S. Nicholson
中科院分区：
文献类型：
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作者：
S. Swart;M. D. Plessis;A. Thompson;L. Biddle;I. Giddy;T. Linders;M. Mohrmann;S. Nicholson
海洋中的次尺度流动是能量运动，O(1-10 km)，它影响分层和特性的分布，例如热量和碳。人们认为它们通过调节空气-海冰通量和海冰范围在受海冰影响的海洋中发挥重要作用。在南大洋的海冰区域中没有观察到这些流动的强度及其对风力的响应。我们展示了由水面和水下自动驾驶车辆在南极夏季超过 3 个月收集的南极边缘冰区 (MIZ) 的首次亚尺度分辨观测结果。我们观察到以亚公里尺度发生的盐度主导的横向密度锋。研究表明，表面风会改变混合层密度锋的大小，揭示大气-海洋过程的强耦合。我们认为这些风锋相互作用是锋面滑落和垂直混合之间的连续相互作用而发生的，这导致了亚中尺度锋面的分散。预计此类过程在南大洋 MIZ 中将普遍存在。
Submesoscale flows in the ocean are energetic motions, O(1–10 km), that influence stratification and the distributions of properties, such as heat and carbon. They are believed to play an important role in sea‐ice‐impacted oceans by modulating air‐sea‐ice fluxes and sea‐ice extent. The intensity of these flows and their response to wind forcing are unobserved in the sea‐ice regions of the Southern Ocean. We present the first submesoscale‐resolving observations in the Antarctic marginal ice zone (MIZ) collected by surface and underwater autonomous vehicles, for >3 months in austral summer. We observe salinity‐dominated lateral density fronts occurring at sub‐kilometer scales. Surface winds are shown to modify the magnitude of the mixed‐layer density fronts, revealing strongly coupled atmosphere‐ocean processes. We posture that these wind‐front interactions occur as a continuous interplay between front slumping and vertical mixing, which leads to the dispersion of submesoscale fronts. Such processes are expected to be ubiquitous in the Southern Ocean MIZ.