Multi‐Stage Development Within Anisotropy Insight of an Anticyclone Eddy in Northwestern South China Sea in 2021
Multi‐Stage Development Within Anisotropy Insight of an Anticyclone Eddy in Northwestern South China Sea in 2021
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DOI：
10.1029/2023gl104736
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发表时间：
2023-10
影响因子：
5.2
通讯作者：
J. Qiao;C. Qiu;D. Wang;Y. Huang;X. Zhang
中科院分区：
文献类型：
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作者：
J. Qiao;C. Qiu;D. Wang;Y. Huang;X. Zhang
中尺度涡流有助于调节海洋能量级联。涡流变形影响正压不稳定性，它代表尺度之间的动能传递；然而，正压不稳定结构尚未得到很好的研究。我们研究了温跃层内涡流（ITE）并开发了一种新颖的各向异性方法来检查水平正压不稳定性。从 5 月到 7 月，使用最先进的自主水下航行器对 ITE 的开发进行了监控。 ITE于6月被困，并于7月向东移动。基于各向异性理论，正压不稳定性分为各向同性和各向异性产物。各向异性包含有关涡流的形状和平均流量反馈的信息。正压不稳定性是ITE向东传播的主要来源，并以各向异性产生为主。随着形状和各向异性的变化，ITE通过6月的各向异性剪切产生和7月向东移动时的各向异性拉伸产生获得平均流动能。
Mesoscale eddies help regulate ocean energy cascades. Eddies deformation influences barotropic instability, which represents kinetic energy transfer between scales; however, the barotropic instability structure has not been well studied. We investigated an intra‐thermocline eddy (ITE) and developed a novel anisotropic method to examine the horizontal barotropic instability. The development of the ITE was monitored using a state‐of‐the‐art autonomous underwater vehicle from May to July. The ITE became trapped in June and moved eastward in July. Based on anisotropic theory, the barotropic instability was separated into isotropic and anisotropic productions. The anisotropy contained information regarding shape and mean flow feedback of the eddy. Barotropic instability was the main source for ITE eastward propagation and was dominated by anisotropic production. Following a shape and anisotropy change, the ITE gained the mean‐flow kinetic energy by the anisotropy shear production in June and by the anisotropy stretch production when moving eastward in July.