Abstract
The variations of the frontogenetic trend of a cold filament induced by the cross-filament wind and wave fields are studied by a non-hydrostatic large eddy simulation. Five cases with different strengths of wind and wave fields are studied. The results show that the intense wind and wave fields further break the symmetries of submesoscale flow fields and suppress the levels of filament frontogenesis. The changes of secondary circulation directions—that is, the conversion between the convergence and divergence of the surface cross-filament currents with the downwelling and upwelling jets in the filament center—are associated with the inertial oscillation. The filament frontogenesis and frontolysis caused by the changes of secondary circulation directions may periodically sharpen and smooth the gradient of submesoscale flow fields. The lifecycle of the cold filament may include multiple stages of filament frontogenesis and frontolysis.
摘 要
采用大涡模拟模式, 基于湍流热成风原理, 在垂直于涡丝方向及不同强度风浪场情况下, 探究了海洋亚中尺度冷涡丝的锋生变化趋势. 本文作者发现增强的风浪场能够进一步破坏亚中尺度流的空间对称结构, 并抑制了锋生强度. 由于科氏力诱导的惯性震荡作用, 次级环流的方向产生了周期性的变化, 进而导致了冷涡丝的锋生过程包括了锋生和锋消两个物理过程. 锋生和锋消能够周期性地锐化和平滑亚中尺度流场, 从而造成了在亚中尺度冷涡丝的生命周期内, 能够包含多个阶段的锋生物理过程.
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Acknowledgements
This research was supported by the National Natural Science Foundation of China (Grant Nos. 92158204, 41506001 and 42076019) and a Project supported by the Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) (Grant No. 311021005). The LES model was provided by the National Center for Atmospheric Research. All numerical calculations were carried out at the High Performance Computing Center (HPCC) of the South China Sea Institute of Oceanology, Chinese Academy of Sciences.
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Article Highlights
• The direction of secondary circulations has a periodic change.
• Cold filament frontogenesis includes frontogenesis and frontolysis.
• The magnitude of the wind and wave fields impacts the intensity of cold filament frontogenesis.
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Li, G., Wang, D., Dong, C. et al. Frontogenesis and Frontolysis of a Cold Filament Driven by the Cross-Filament Wind and Wave Fields Simulated by a Large Eddy Simulation. Adv. Atmos. Sci. 41, 509–528 (2024). https://doi.org/10.1007/s00376-023-3037-2
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DOI: https://doi.org/10.1007/s00376-023-3037-2